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USER MANUAL
VT-MODEM
Industr ial Modems
Installation & Maintenance
Contents at a Glance:
Section 1 Overview 2
Section 2 Performance Specifications 5
Section 3 VT-MODEM Mounting 6
Section 4 Electrical Connections 7
Section 5 Modem Configuration 14
Section 6 AT Command Summary 18
Section 7 S-Register Summary 21
Section 8 Maintenance Information 23
Section 9 Product Support & Other Documents 24
This manual applies to the following products:
General purpose industrial modem (VT-MODEM-1##)Self-dialingindustrial modem (VT-MODEM-2##)RS485 industrial modem(VT-MODEM-3##)
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Section 1 Overview
The Sixnet VT-MODEMs are rugged industrial telephone modems thathave been designed for operation in
electrical enclosures installed in harsh environments. EachVT-MODEM supports all standard Hayes AT
commands, Fax Class 1 and Class 2 commands and S-registers andtherefore can be set-up as an external
modem on any PC. The VT-MODEMs are compatible with anytelecommunications or dial-up networking
software.
A VT-MODEM allows easy access to PLCs, Sixnet I/O and otherdevices via dial-in telephone connections.
The modem may be DIN rail or panel mounted for convenient andeasy installation adjacent to other DIN
rail components inside of new or existing enclosures. MostWindows software can communicate through a
VT-MODEM to remote devices to perform file transfers,diagnostics, program debugging and many other
operations.
All Sixnet Industrial Modems allow communication to remote sitesfor data retrieval or diagnostics.
Note: All VT-MODEM models communicate over analog phone linesonly.
The Sixnet PLC Self-Dialing Modem (VT-MODEM-2) has all thefeatures of the Sixnet Industrial Modem
(VT-MODEM-1), plus the ability to dial out based on an alarmcontact or PLC discrete output.
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Identifying the modem you haveThis section will show how toidentify what revision of modem you have.
1. The Sixnet VT-MODEM Wizard will detect the version of themodem you have. Open the wizardand detect the modem you areconnected to by selecting the COM port your modem is connectedto
and clicking the red Detect Modem button on most configurationscreens. The firmware version of
your modem is indicated as Rev 1, Rev 2 or Rev 3, otherwise thedifference is seamless to the typicalWizard user.
2. On the back of the modem there is a white sticker called theback label that indicates among otherthings the revision number(Rev) and modem models. Please see the tables belowto see howto
interpret this number.
3. You can also detect the modem type using HyperTerminal. Toquery the firmware version enter
ati3. Please see the tables belowfor information on how tointerpret this firmware rev
number.
VT-MODEM-1
VT-MODEM Wizard Rev 1 Rev 2 Rev 3
Back Label 1.00-1.08, 1.10-2.02 1.09 3.00 and above
HyperTerminal (ati3) V2.100-V34_2M_DLS P2109-V90 CX81802-V34
VT-MODEM-2
VT-MODEM Wizard Rev 1 Rev 2 Rev 3
Back Label 1.00-1.04, 1.06-1.08 1.04/1.05 2.00HyperTerminal(ati3) V2.100-V34_2M_DLS P2109-V90 CX81802-V34
VT-MODEM-3
VT-MODEM Wizard Rev 1 Rev 2 Rev 3
Back Label 1.00-1.02, 1.04-1.06 1.02/1.03 2.00
HyperTerminal (ati3) V2.100-V34_2M_DLS P2109-V90 CX81802-V34
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VT-MODEM-2 Self-Dialing Feature
The Self-Dialing Modem is triggered by a switch closure or PLCoutput signal. It dials a pre-stored phone
number and optionally identifies itself by way of a pre-storedASCII message. Flexible features allow this
modem to perform retries or even connect to alternate numberuntil it has verified that a connection has been
established. The call will terminate when either:
The computer completes its polling and hangs up
The modem discrete input is turned off
A telephone line problem disrupts the call.
The VT-MODEM-2 enables field installed equipment to establish atelephone link based upon a simple
switch closure. This self-dialing modem adds dial upon alarmintelligence to any remote site. This
enhanced modem is ideal for:
DIALING UPON ALARM FROM ANY PLC
This modem establishes a connection based upon a coil outputfrom any PLC. Once a connection has
been established, the PLCs system (programming) port isconnected to the computer at the other end
of the phone link and may be polled by that computer as if thecomputer had initiated the call. When
the modem connects to the central computer, it identifies itselfso the computer can run theappropriate I/O driver and interrogatethe PLC.
SENDING A MESSAGE BASED UPON A SWITCH CONTACT
Locations that do not have PLCs (or other intelligence) canoriginate calls to alert you to low tank
levels, over temperature conditions, or other alarms. Simplyconnect the appropriate alarm contact to
the modems input. The modem will dial the pre-stored phonenumber and deliver the ID message to
the computer at the receiving end.
VT-MODEM-3 RS485 Port
The VT-MODEM-3 Industrial Modem Plus has an RS422 / RS485 portthat can function in place of itsRS232 port. The RS422 / RS485 portsupports RS422 and RS485 full duplex and two wire RS485 half
duplex communication to compatible devices. The VT-MODEM-3 isuser-configurable to communicate
through either the RS232 port (VT-MODEM-1 mode) or through theRS422 / RS485 port. Only one port can
be used at a time.
VT-MODEM SETUP WIZARD
A modem setup utility is provided on the Sixnet CD to help youquickly configure any Sixnet Industrial
Modem. In most applications, no knowledge of modem AT commandsor S register contents is necessary.
Pre-configured profiles, for common situations are provided foryour convenience. An extensive online help
file is provided with this utility.
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Section 2 Performance Specifications
Telephone Line (All models)
Max. Data Rate 33.6 kbps (V.34)
Compatibility V.34, V.32bis, V.32, V.22bis, V.22A/B, V.23, V.21,Bell212A & 103
Data Compression V.44/V.42bis/MNP 5
Error Correction V.42/MNP 2-4
Max Fax Modem Rate 14.4 kbps (V.33)
Fax Modem Compatibility Group 3 (V.33, V.17, V.29, V.27ter, V.21ch. 2)Ringer Equivalent 0.3
Line Jack RJ11
Phone Jack RJ11 (VT-MODEM-1 and 2)
RS232 Port (All models)
Max. RS232 Rate 115.2 kbps (Kilobaud)
RS232 Signal Support TXD, RXD, CTS, RTS, DCD, DTR, DSR, RI,GND
RS232 Connector DB9 female, RS232
Command Set All standard AT and S register commands includingClass 1, Class 2 Fax commands
and Voice commands
RS422 / RS485 Port (VT-MODEM-3 onl y)
RS422 mode 4 wire full duplex
RS485 modes 2 or 4 wire party-line operation (half duplex)
Signal rate Standard rates up to 115.2 kbps (Kilobaud)
RS422 / RS485 distance Up to 0.5 miles
Status LEDs (All models)
CD (Carrier detect) The modem has detected a carrier on thephone line (a remote modem has been
detected).
TR (Data Terminal Ready) The PC (or Gateway/VersaTRAK) hasestablished a connection to the modem and is
ready.
RD (Receive Data) Flashes as data is received from the phoneline.
TD (Transmit Data) Flashes as data is sent out the phoneline.
Power On when power is present.
General Characteristics (All models)
Input Power 10 - 30 VDC (VT-MODEM-1, 2), 10 52 VDC(VT-MODEM-3)
Input Current (Rev 1 and Rev2, see
section 1)
65mA @ 24VDC and 26mA in Low Power mode of 1 (typical)
97mA @ 24VDC and 64mA in Low Power mode of 2 (typical)
68mA @ 24VDC and 28mA in Low Power mode of 3 (typical)InputCurrent (Rev 3) 50mA @ 24VDC and 30mA in Low Power mode for -1 and-2 (typical)
55mA @ 24VDC and 35mA in Low Power mode for -3 (typical)
Certification FCC Part 15 and FCC Part 68; UL 508; CSAC22.2/14;
ACA TS 001- 1997; ACA TS 002-1997; AS/NZS3260-1993;
AS/NZS3548-1995; CTR21 (98/482/EC); EN55022; IEC 950:1991.
Operating Temperature -30 to 70 C
Storage Temperature -40 to 85 C
Humidity 5 to 95% RH (non-condensing)
Mounting DIN rail or panel mount
Dimensions W x 4.75L x 1.35H inches (8.2 W x 12.1 L x 3.4Hcm)
PLC Discrete I/O Interface (VT-MODEM-2 only)
Trigger Input (From PLC) Connects to PLC output. Startsauto-dialing upon transition from OFF to ON. Modem
will stay connected while input is ON.
Voltage Range 9 to 30 VDCInput Current 6.5 mA at 24 VDC
Max. OFF Voltage 5 VDC
On-line Output (To PLC) Output is ON as long as a connectionexists (carrier detect).
Output Characteristics Sourcing switches supply power
Max. Output Current 100 mA
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Section 3 VT-MODEM MountingThe VT-MODEM snaps onto standard DINrail (DIN EN 50022) or is mounted to a flat panel using #6 or#8
screws. See Figure 3-1. The modem can be installed in anyorientation, directly adjacent to other DIN rail
components or in any convenient location within the enclosure.The modem should be installed within 6 feet
of the device it will be connected to.
Figure 3-1: VT-MODEM DIMENSIONS, ALL MODELS
For DIN rail mounting, hook the top, rear of the modem onto thetop edge of the DIN rail. Using a small flat
head screwdriver, pull down on the spring-loaded tab on thebottom of the modem and push the modem back
against the rail. Reverse these steps to remove the modem. SeeFigure 3-2 below.
Figure 3-2: DIN RAIL MOUNTING
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Section 4 Electrical Connections
RS232 Connections (All VT-MODEM Models):Use the Sixnet RS232cable (VT-CABLE-MDM, which is 6 feet in length) or an equivalentcable to connect
the modem's RS232 port (DB9 Male cable end) to the RS232 port ona SIXTRAK Gateway, VersaTRAK
RTU or PC (DB9 Female cable end). As shown in Figure 4-1, theVT-CABLE-MDM is a straight through
serial communications cable suitable for connecting a DTE device(PC, Gateway or VersaTRAK) to a DCE
device (VT-MODEM). For IPm and ST-GT-1210 stations, use astraight-through Ethernet cable (notsupplied) and the RJ45 to DB9male adapter that came with the station.
Cable requirements for PLCs and other devices may be different.Refer to the PLC or other devices
documentation for cable pinouts. Some PLC cables are documentedin the Technical notes provided on the
Sixnet CD that came with your modem.
Figure 4-1: VT-CABLE-MDM Wiring
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VT-MODEM-1 Power, Phone Line Connections:
DC Power Wiring
Connect 10 - 30 VDC to the VT-MODEM-1 as shown in Figure 4-2.The modem can usually be powered
from the same DC source as other devices in the enclosure. Allthe screw terminals should be tightened to a
maximum of 3.48 in-lbs.
Telephone CableConnect analog phone lines to the RJ-11 jacks asappropriate. One RJ-11 jack is provided to connect directly
to a telephone (optional) and the second RJ-11 jack functions asthe connection to the telephone network.
Figure 4-2: VT-MODEM-1 WIRING
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VT-MODEM-2 Power, Phone Line, Self-Dial Connections:
DC Power Wiring
Connect 10 - 30 VDC to the VT-MODEM-2 as shown in Figure 4-3.The modem can usually be powered
from the same source as other devices in the enclosure. All thescrew terminals should be tightened to a
maximum of 3.48 in-lbs.
Telephone CableConnect analog phone lines to the RJ11 jacks asappropriate. One RJ-11 jack is provided to connect directly
to a telephone (optional) and the second RJ-11 jack functions asthe connection to the telephone network.
PLC Self-Dial I/O Connections
Connect a 10-30VDC signal to the From PLC (trigger input)terminal. An OFF to ON transition of this
signal starts the auto-dialing sequence. The modem will call andremain connected while the signal is ON.
When the signal goes false, the modem will terminate theconnection or the call in progress.
The To PLC (on-line output) terminal will go ON (ON = usersupplied VDC input) when a modem to
modem connection has been established and the proper AcknowledgeMessage has been received.
Figure 4-3: VT-MODEM-2 WIRING
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VT-MODEM-3 Power, Phone Line, RS422 / RS485 Connections:
DC Power Wiring
Connect 10 - 52 VDC to the VT-MODEM-3 as shown in Figure 4-4.The modem can usually be powered
from the same source as other devices in the enclosure. All thescrew terminals should be tightened to a
maximum of 3.48 in-lbs.
Telephone CableConnect an analog phone line to the RJ-11 jack asappropriate.
RS422 / RS485 Cabling and DIP Switch Settings
Refer to Figure 4-4 for typical wiring configurations. Fabricatea cable to connect the modem's RS422 /
RS485 port to the field device(s).
The VT-MODEM-3 has DIP switches. These switches establish themode of operation for the RS422/RS485
port. Set these switches to match the type of wiring connectedto the RS422/RS485 port. Refer to Figure 4-5
See Also8A 8A Construction Continues on Andrews Instituteking-solomon--a-drama-in-five-acts-relating-to-incidents-in-the-life-of-the-wise-kingDepression Definition Symptoms Test Medicationon the next page. It is not necessary to cycle power to themodem if DIP switch changes are made.
Figure 4-4: Typical RS422 / RS485 Wiring
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Figure 4-5: Detailed RS422 / RS485 Wiring and DIP SwitchSettings
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VT-MODEM-3 DIP Switch Summary
2 wire RS485 Cabling
Receive Bias Enabled (RS485 4 wire Cabling)
Transmit Bias Enabled (RS485 2 and 4 wire Cabling)
7 ON, 8 OFF = 2 wire Termination Enabled
7 ON, 8 ON = 4 wire Termination Enabled
7 ON, 8 OFF = 2 wire Termination Enabled
2 and 4 wire Termination Disabled
Transmit Bias Disabled (RS485 2 and 4 wire Cabling)
Receive Bias Disabled (RS485 4 wire Cabling)
RS422 or 4 wire RS485 Cabling
RS422 / RS485 Network Termination
The VT-MODEM-3 has built-in termination components for theReceive Data and Transmit Data signals.
Termination of these signals is enabled by setting DIP switcheson the VT-MODEM-3. Termination
components are often built into other RS422 / RS485 devices, andare typically enabled by setting a jumper
or DIP switch on the appropriate device.
Here are some guidelines for the use of termination:
Terminations should be enabled at both ends of an RS422communication cable.
Terminations should be enabled at both end stations on an RS485network. No more than two stationsshould be terminated on an RS485network.
Bias Resistors (RS485 networks only)On an RS485 two wire networkthere should be one pair of bias resistors acting upon thetransmit/receive
wires. On an RS485 four wire network there should be two pairsof bias resistors; one pair on the receive
wires and one pair on the transmit wires. Bias resistors forcethe receive or transmit/receive wires to a known
(non-floating) state when none of the RS485 devices aretransmitting data. If bias resistors are not present,
some RS485 devices may experience communication errors due tonoise on the floating wires. Bias resistors
do not apply to RS422 wiring because the wires are always drivenby the two RS422 devices. The wires are
not permitted to float.
The location of the bias resistors is not critical. Typicallythey are installed at the master RS485 device. Bias
resistors are provided in the VT-MODEM-3 and are enabled throughDIP switch settings. There should be
only one pair of these resistors connected to an RS485 two wirenetwork, and only two pairs of theseresistors connected to an RS485four wire network. Refer to Figure 4-5 for recommendedVT-MODEM-3
DIP switch settings. Do not enable the VT-MODEM-3 bias resistorsif there are bias resistors enabled on one
of the other RS485 devices.
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Typical RS485 Network Bias and Termination
Configuring a PC Modem to Communicate with a VT-MODEM-3 in RS422or RS485 Mode:
It may be necessary to change your PCs modem settings whencommunicating with a VT-MODEM-3
running in RS422 or RS485 mode. The PC modem, VT-MODEM-3 and themodem-to-modem speed should
all be set to the same rate.
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Section 5 Modem Configuration
Configuring a VT-MODEM for use with Sixnet I/O:
All VT-MODEM models are factory configured to use the defaultcommunication settings for SIXTRAK
Gateways and VersaTRAK RTUs. If a VT-MODEM is connected to aPLC, PC or other non-Sixnet device,
then it may be necessary to reconfigure the modem. See theupcoming sections for further details.
AT Command String at PowerupUpon powerup, a SIXTRAK gateway orVersaTRAK RTU can send a command string to a VT-MODEM.
This capability can be used to assure that the modem is set to aparticular mode of operation, such as auto
answer mode. Refer to the Set Modem String topic in the PlantFloor programs online help for
information on this capability. Any standard AT command can besent by the gateway or RTU.
Configuring a VT-MODEM as an External Modem on a PC:
The VT-MODEM can be connected directly to a PC. The modem willneed to be installed in Windows
prior to use. Here are instructions to install the modem in bothWindows 95, 98 and Windows NT.
Modem Installation in Windows 95/98
Plug and Play method (recommended):
1) With the PC off, connect DC power and the telephone line tothe VT-MODEM. Connect a
communications cable (VT-CABLE-MDM or equivalent) between theVT-MODEM and the PC. Turn
on the PC. During the boot-up process, Windows should detect themodem and display the New
Hardware Found dialog box.
2) Make the selection Select from a list of alternativedrivers.
3) The Select Device dialog will be displayed. In the columnlabeled Manufacturers, select Standard
Modem Types. In the column labeled Models, select Standard 28800bps Modem. Click OK.
Windows will then complete the boot-up process. (The standardWindows driver is used for the VT-
Modem. Although the VT-Modem supports baud rates to 33,600 bps,the selections in Windows are
limited to 28800 bps.)4) To verify that the modem has beeninstalled, select StartSettingsControl Panel, and then double
click the Modems icon. The modem should be listed as Standard28800 bps Modem.
Here is an alternate modem installation procedure (use if the PCis already powered up):
1) Connect the DC power, communications cable (VT-CABLE-MDM orequivalent) and telephone line as
described above.
2) Select StartSettingsControl Panel, and then double click theModems icon.
3) The Install New Modem dialog box will appear. Do not selectthe Dont detect my modem, I will select
it from a list. Instead, click Next and allow Windows to searchthe com ports and detect the modem.
4) Windows should find a modem called Standard Modem. Click Nextand Windows will complete
installation of the Standard Modem. (Alternately, click Changeand select Standard Modem Typesfrom the Manufacturers list, andStandard 28800 bps Modem from the Models list.)
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5) To verify that the modem has been installed, selectStartSettingsControl Panel, and then double
click the Modems icon. The modem should be listed as either aStandard Modem or a Standard
28800 bps Modem depending on the steps followed above.
6) Upon re-booting the machine, Windows may still find theVT-MODEM as new hardware. If this
happens, select Do not install a driver (Windows will not promptagain).
Modem Installation in Windows NT
1) Select Start
Settings
Control Panel, and then double click the Modems icon.2) TheInstall New Modem dialog box will appear. Do not select the Dontdetect my modem, I will select
it from a list. Instead, click Next and allow Windows to searchthe com ports and detect the modem.
3) Windows should find a modem called Standard Modem. Click Nextand Windows will complete
installation of the Standard Modem. (Alternately, click Changeand select Standard Modem Types
from the Manufacturers list, and Standard 28800 bps Modem fromthe Models list.)
4) To verify that the modem has been installed, selectStartSettingsControl Panel, and then double
click the Modems icon. The modem should be listed as either aStandard Modem or a Standard
28800 bps Modem depending on the steps followed above.
Modem Installation in Windows XP
1) Select StartSettingsControl Panel, and then double-click thePhone and Modems Options icon.2) Go to the Modems tab and click theAdd button to install a new modem. The Install New Modem wizard
will appear. Select the Dont detect my modem, I will select itfrom a list.
3) Highlight the manufacturers list Standard Modem Types. Fromthe models list select Standard 28800bps Modem, then clickNext.
4) Select the COM Port on your computer the modem will beconnected to.5) To verify that the modem has been installed, selectStartSettingsControl Panel, and then double
click the Phone and Modem Options icon. Go to the Modems tab.The modem should be listed as a
Standard 28800 bps Modem connected to COM port you selected.
Once the VT-MODEM modem has been added to your Windows 95, 98,NT or XP system, it is ready for
use.
If you are using Sixnet I/O, you can use the Sixnet Sixdialsoftware to dial out and establish a connection
with your Sixnet I/O. The Sixdial utility allows other Sixnetprograms to perform operations such as data
transfers, hardware configuration and diagnostics, and ISaGRAFprogramming. (Refer to the on-line help in
the Sixdial utility for more information on these softwaretools).
If you are using a PLC or other device, refer to thedocumentation for that device as necessary.
To Remove a Modem
If it ever becomes necessary to re-install the modem for anyreason, select StartSettingsControl Panel
and then double click the System icon. Next, click the DeviceManager tab. The list should display aModems icon. Double click theModems icon. Highlight the modem to be removed and then clickthe
Remove button. To reinstall the modem, follow the installationsteps as previously described.
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Configuring a VT-MODEM Using the VT-MODEM Setup Wizard:
It is highly recommended that the Sixnet VT-MODEM Setup Wizardbe used for VT-MODEM
configuration. Simply check the appropriate boxes, choose theappropriate communication settings from the
dropdown lists, and load the configuration into the VT-MODEM.This utility does not require user
knowledge of AT commands and S-registers.
Refer to the online help system in the VT-MODEM Setup Wizard forinstructions and application notes.
Note: The VT-MODEM Setup Wizard must be used to configure theself dial parameters of the VT-
MODEM-2 and the RS422 / RS485 port parameters of theVT-MODEM-3.
Setting the Modem's Baud Rate for the PLC
The VT-MODEM has an automatic baud rate detection feature thatlets the modem recognize commands through its
serial port at any supported baud rate. However, if the modem isconnected to a device that does not send commands or
data unless spoken to (such as most PLCs), then the modem willpass information from the phone line to its serial port
at the last auto-detected baud rate. This is typically the baudrate used by the VT-MODEM setup Wizard when
configuring the modem.
The VT-MODEM is defaulted at the factory for 9600-baud. Tochange this setting, connect the modem to a PC. Start
the VT-MODEM setup Wizard and choose the baud rate that matchesthe PLCs baud rate. Then choose the
appropriate settings and write the configuration to the modem.Exit the VT-MODEM setup Wizard and reconnect the
modem to the PLC. (Be sure to cycle power to the modem.) Callthe modem and verify that the PLC is responding to
commands.
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Limiting the Phone Line Connection Speed for Reliability
Typically, when a modem-to-modem connection is established, thetwo modems negotiate and connect at the fastest
possible phone line speed that is within the capability of bothmodems. The quality of the phone line connection
(during the negotiation) will be taken into account. If bothmodems are of a modern design (such as the VT-MODEM),
the phone line speed can be 33.6K bits per second (or higher,using data compression). Note that this phone line speed
is independent of the DTE (serial port) speed, though some oldermodems require that the phone line speed and DTE
speed be the same.
In practice the quality of any phone line changes continually,and frequent data errors may occur. The probability of
errors usually increases as the phone line speed increases.Therefore, it is often desirable to restrict the phone line
speed to a rate that will provide good performance and yieldreliable data. It is also commonplace to restrict the phone
line speed to maintain compatibility when replacing an oldermodem with the VT-MODEM.
By default, the VT-MODEM will permit any phone line speed up to115.2 kbps when data compression is enabled. If
you experience intermittent or unreliable communication, trysetting the modem-to-modem speed (in the VT-MODEM
Setup Wizard) to a lower value, to restrict the phone linespeed. (Remember to load the new configuration to the
modem.)
VT-MODEM Profile Summary
Here is a summary of the active configuration, user profile 0,user profile 1 and the factory defaults when the
modem is shipped. Each time the modem is powered up, first thefactory default settings (as listed in Section6) are loaded intothe active configuration. Next, the designated user stored profileis loaded into the active
configuration. User profile 0 is loaded by default (see the&Y command in Section 6) and it contains all
factory defaults with the exception that it is set to autoanswer (register S0=1), and ignore DTR (&D0).
The User profile 1 contains all normal factory defaults (aslisted in Section 6).
ACTIVE PROFILE:
B1 E1 L1 M1 N0 Q0 T V1 W0 X4 Y0 &C1 &D0 &G0 &J0&K3 &Q5 &R1 &S0 &T5 &X0 &Y0
S00:001 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050S08:002 S09:006
S10:014 S11:085 S12:050 S18:000 S25:005 S26:001 S36:007 S38:020S46:138 S48:007
S95:000
STORED PROFILE 0:
B1 E1 L1 M1 N0 Q0 T V1 W0 X4 Y0 &C1 &D0 &G0 &J0&K3 &Q5 &R1 &S0 &T5 &X0
S00:001 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:085S12:050 S18:000
S36:007 S40:104 S41:195 S46:138 S95:000
STORED PROFILE 1:
B1 E1 L1 M1 N0 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0&K3 &Q5 &R1 &S0 &T5 &X0
S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:085S12:050 S18:000
FACTORY DEFAULTS:B1 E1 L1 M1 N0 Q0 T V1 W0 X4 Y0 &C1 &D2&G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0&Y0
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050S08:002 S09:006
S10:014 S11:085 S12:050 S18:000 S25:005 S26:001 S36:007 S38:020S46:138 S48:007
S95:000
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Section 6 AT Command SummaryAll VT-MODEM models support the ATcommands, Fax Class 1 and Class 2 commands listed in this
Section. The VT-MODEM contains a set of factory defaultsettings, which can always be restored by the
user. (See the &F command.) The modem also provides two userprofiles (profile 0 and profile 1) which
hold settings as set and saved by the user. (See the &Wcommand.) The settings currently in use by the
modem are generally referred to as the active configuration.
Notes:VT-MODEM-2 self-dial parameters and VT-MODEM-3 RS422 /RS485 port parameters can only be set using the VT-
MODEM SETUP Wizard, which is provided on the Sixnet ProgrammableI/O for Windows CD. Refer to the on-line
help in the VT-MODEM Setup Wizard for more information.
The following tables only list the AT commands supported by thecurrent modem firmware. For a complete
list of AT commands, all valid parameters, and default settingsfor each AT command please see the Sixnet
online help system of the VT-MODEM Setup Wizard.
Commands marked with an asterisk (*) have differentcharacteristics, depending on the revision of VT-
MODEM being used. Refer to the online help system of theVT-MODEM Setup Wizard for the details of
these differences.
Command Function
A/ Re-execute Last Command; do not precede with AT command anddo not follow with a carriage
return.
A Go off hook and Answer A Call
AT=x Write value x to last selected register.
AT? Report the value of last selected register.
Bn Set data standard to CCITT(Europe et. al.) or Bell Mode(U.S.,Canada) for connections at 300 or
1200 bps.
Cn Carrier Control (parameter = 1 only)
Dn Dial (originate a call); typical usage: ATDT5551212 to tonedial number. ATDS=n to dial nth
stored number.E Echo command to monitor when typed
Fn Not available.
Hn Disconnect (Hang up)
In Identification; reports product code, name, ROM and firmwaredata, etc.
Ln Speaker Volume (not available)
Mn Speaker Control (not available)
* Nn Automode Enable; enabled allows connection at highestpossible modem speed, disabled fixes
speed according to register S37.
On Return To On-line Data Mode
P Set Pulse Dial Default.
Qn Quiet Results Codes Control; when enabled, result codes arereported to the monitor.
Sn Establishes S Register n as the last register accessed
Sn-x Write value x to S Register n.
Sn? Reports the value of S Register n.
T Set Tone Dial Default
Vn Set Result Code Format to terse or verbose.
Wn Connect Message Control sets the format of the connectmessages.
Xn Extended results code
Yn Long space disconnect
Zn Perform Soft Reset and Restore stored user configurationprofile 0 or 1.
&Cn RLSD (DCD) Option; set DCD signal to indicate presenceof carrier or forces DCD signal on at
all times.
&Dn DTR Option; set how modem interprets the DTR signal.
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&Fn Restore factory configuration profile 0 or 1.
&Gn Select guard tone
&Jn Telephone jack control
&Kn Set Flow Control
* &Mn Asynchronous/synchronous mode selection
&Pn Select pulse dial make/break ratio
* &Qn Asynchronous/synchronous mode selection
&Rn RTS/CTS option sets how the modem controls the CTSsignal
&Sn DSR Override sets how the modem controls the DSRsignal&Tn Test & diagnostic settings
&V Display current configuration, stored user profiles andstored telephone numbers
&V1 Display last connection statistics
&Wn Store current active configuration in one of the twouser profiles
&Xn Select synchronous clock source
&Yn Designate a default-reset profile. This profile will beactive after a hard reset
* &Zn=x Store phone number; n = 0 to 3 and x = dialstring
%E Enable/disable line quality monitor and autoretrain orfallback/fail forward
%L Report line signal level
%Q Report line signal quality
%7 Plug and Play Serial Number
%8 Plug & Play Vendor ID, Prod. No.\Kn Break Control setshow the modem responds to a break signal
\Nn Sets the Operating Mode of the modem: direct, normal,reliable or auto reliable
\Vn Single Line Connect Message Enable
\An Select Max MNP Block Size
\Bn Transmit Break to Remote sets the length of break signalsent to remote modem(in non error
correction mode)
* +MS Select Modulation allows control of the modulation themodem uses to negotiate a connection
* +VDR Enable/disable distinctive ring
*+GCI Country Select
*+A8E V.8 and V.8bis Operation Controls
%Cn Enable/Disable Data Compression (MNP5, V42bis or both)
)Mn Enable Cellular Power Level Adjust (only included forcompatibility and performs no function)@Mn Initial Cellular PowerLevel Setting (only included for compatibility and performs nofunction)
:E Compromise Equalizer Enable (only included for compatibilityand performs no function)
*B Display Blacklisted Numbers
*D Display Delayed Numbers
-Kn MNP Extended Services
#UD Last Call Status Report
Voice Commands:A Answering in Voice/Audio Mode.D Dial command inVoice/Audio Mode.H Hang up in Voice/Audio Mode.Z Reset fromVoice/Audio Mode.
*#BDR Select baud rate (turn off autobaud). Enable/Disable RPIand DTE Speed
#CID Enable Caller ID detection and select reporting format.
#CLS Select data, fax, or voice/audio.
#MDL? Identify model.
#MFR? Identify manufacturer.
#REV? Identify revision level.
#TL Audio output transmit level.
#VBQ? Query buffer size.
#VBS Bits per sample (ADPCM or PCM).
#VBT Beep tone timer.
#VCI? Identify compression method (ADPCM).
#VLS Voice line select (ADPCM or PCM).
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#VRA Ringback goes away timer (originate).
#VRN Ringback never came timer (originate).
#VRX Voice Receive Mode (ADPCM or PCM).
#VSD Enable silence deletion (voice receive, ADPCM).
#VSK Buffer skid setting.
#VSP Silence detection period (voice receive, ADPCM).
#VSR Sampling rate selection (ADPCM or PCM).
#VSS Silence detection tuner (voice receive, ADPCM).
#VTD DTMF tone reporting capability.#VTM Enable timing markplacement.
#VTS Generate tone signals.
#VTX Voice transmit mode (ADPCM or PCM).
* Caller ID:
+VCID Enabling and configuring parameters of Caller IDdetection.
Synchronous Access
Mode:
* +ES Enable/Disable Synchronous Access Mode in the client orcentral site modem
+ESA Configures the Operation of the Synchronous AccessSubmode
+ITF Selects Transmit Flow Control Thresholds
Fax Commands:
*+FCLASS Select Active Service Class*+FAA Auto answer enable
*+FAE Auto answer enable
*+FTS Stop transmission and pause
*+FRS Wait for silence
*+FTM Transmit data with carrier
*+FRM Receive data with carrier
*+FTH Transmit HDLC data with carrier
*+FRH Receive HDLC data with carrier
*+FAR Adaptive reception control
*+FCL Carrier loss timeout
*+FDD Double escape character replacement control
*+FIT DTE inactivity timeout*+FPR Fixed DTE Rate
*+FMI? Report manufacturer ID
*+FMM? Report model ID
*+FMR? Report revision ID
*+FLO Flow Control
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Section 7 S Register Summary
Note:
The following tables only summarize the supported S-registers. Adescription for each S-register may be
found in the online help system of the VT-MODEM SetupWizard.
Register Function Range Units Default
S0 Number of rings required before modem auto answers 0-255rings 0S1 Ring counter increments each time a ring is detected0-255 rings 0
S2 Escape character 0-255 ASCII 43
S3 Carriage return character 0-127 ASCII 13
S4 Line feed character 0-127 ASCII 10
S5 Backspace character 0-255 ASCII 8
S6 Maximum time to wait after going off-hook to dial whenblind
dialing
2-255 sec 2
S7 Maximum time to wait for carrier after dialing beforehanging
up
1-255 sec 50
S8 Pause time for dial delay modifier 0-255 sec 2
S9 Carrier detect response time; duration that carrier mustbe
present for modem to consider it a valid connection
1-255 0.1s 6
S10 Carrier loss disconnect time; carrier must be absent forthis time
for modem to consider it a lost connection
1-255 0.1s 14
S11 DTMF tone duration 50-255 0.001s 95
S12 Escape prompt delay; this delay must be present afterreceipt of
the last character of the escape sequence( before receipt ofany
other character) for the escape sequence to be recognized
0-255 0.02s 50
S13 Reserved - - -
S14 General bit mapped options indicates the status of thefollowing
options: echo, quiet mode, results codes, tone/pulse and
originate/answer
- - 138(8Ah)
S15 Reserved - - -
S16 Test mode bit mapped options (&T) - - 0
S17 Reserved - - -S20 AutoSync HDLC Addr or BSC Sync Char 0-255- 0
S21 V24/general bit mapped options indicates the status ofthe
following options: CTS(&Rn), DTR(&Dn), DCD(&Cn),
DSR(&Sn), long space disconnect(Yn)
- - 52(34h)
S22 Speaker/results bit mapped options indicates the status ofthe
following options: speaker control(Ln), volume(Mn), results
codes(Xn)
- - 117(75h)
* S23 General Bit Mapped Options - - 58(3Ah)
S24 Sleep inactivity timer sets the length of time that themodem will
operate in normal mode without activity on the phone orRS232
port before entering sleep mode
0-255 s 0
S25 Delay to DTR (CT108) off sets time modem ignores DTRsignalbefore taking action specified by &Dn 0-255 s/0.01s 5
S26 RTS-to-CTS (CT105 to CT106) delay if &R0 is set 0-2550.01s 1
S27 General Bit Mapped Options for sync/async
control(&Mn/&Qn), leased line control(&Ln),clock
select(&Xn), Bell/CCITT mode(Bn)
- - 73(49h)
S28 General Bit Mapped Options indicates options for pulse
dialing(&Pn), MNP Link negotiation speed(*Hn)
- - 0
S29 Flash Modifier Time sets the length of time the modem willgo
on hook if the flash dial modifier(!) is encountered in thedial
string
0-255 10 ms 70
S30 Inactivity timer sets the length of time the modem willremain 0-255 10s 0
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on line if no data is sent or received
S31 General Bit Mapped Options - - 194(C2h)
S34-S35 Reserved - - -
S36 LAPM Failure Control used when register S48=128 - - 7
S38 Delay before forced hang-up (time delay between the receiptof
H command to disconnect and the actual disconnect operation
0-255 s 20
S39 Flow control bit mapped options - - 3
S40 General bit mapped options - - 104(68h)
S41 General bit mapped options - - 195(C3h)S42-S45 Reserved - --
S46 Enable/Disable Data Compression - - 138
S48 V.42 Negotiation Control - - 7
S82 LAPM Break Control - - 128(40h)
S86 Call Failure Reason Code; when the No Carrier result codeis
issued, the reason for the failure is written to thisregister
0-255 - -
S91 PSTN transmit attenuation level 0-15 dBm 10
S92 Fax transmit attenuation level 0-15 dBm 10
S95 Result code messages control - - 0
S210 V.34 Symbol Rate 0-255 13 (0Dh)
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Section 8 Maintenance Information
Troubleshooting Tips
VT-MODEM Default LED Indications
All VT-MODEM models have the following LEDs.
LED Default Indication
Carrier Detect This LED will come ON once a phone lineconnection has been established, and
will remain on for as long as the connection is maintained.
Data Terminal Ready This LED should be ON at all times.
Receive Data This LED will come ON whenever characters arereceived through the phone line.
Transmit Data This LED will come ON whenever the modem sendscharacters out the phone
line.
Power LED Normal Indication (All models): This LED will be ONwhen power is applied to
the modem.
Additional States(VT-MODEM-2 only): A Slow blink indicates aninvalid
configuration or that the Block COM Port Until Connected featureis enabled.
A Fast blink indicates that a self-dial is in process or thatthe modem is in
Configure Self-dialing Parameters mode.
Note: The RD and TD LEDs indicate the flow of characters in andout of the phone line interface of the VT-MODEM, and are
not directly connected to the RS232 port (all models) or RS422 /RS485 port (VT-MODEM-3).
Reconnecting Serial Cables
It is important to cycle (remove and then reapply) DC power to aVT-MODEM each time the RS232 or RS422 /RS485 cable is disconnectedand then reconnected. The serial port of the modem may not functionproperly if power is
not cycled.
Resetting the VT-MODEM (all models)
If it ever becomes necessary to completely reset the modemincluding both user profiles to the basic factory default
settings , the following command can be issued:
AT&F&W&W1 [CR]
This command string will load the factory defaults into theactive configuration (&F) and then save those settings into
both user profile 0 (&W) and user profile 1 (&W1).
Note that after the modem is reset completely to the factorydefaults, it will no longer be set to auto-answer, which is
often necessary for the modem to work when connected to a remotedevice. Use the VT-MODEM Setup Wizard to
adjust these settings appropriately.
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Section 9 Product Support and Additional DocumentsTo obtainsupport for Sixnet products, call Sixnet and ask for applicationsengineering.
Our phone numbers are:
+1 (518) 877-5173 Office
+1 (518) 877-8346 Fax
e-mail: [emailprotected]
Our mailing address:
Sixnet
Northway Ten Professional Park
P.O. Box 767
Ushers Rd.
Clifton Park, NY 12065
Visit our web page at: http://www.sixnet.com
BUYER PROTECTION PLAN
Sixnet protects your investment in Sixnet industrial modems withthis unique Buyer Protection Plan.
Sixnet provides a liberal 18 month from time of purchase limitedwarranty (see below) on Sixnet industrial
modems. We also offer an extended 36-month warranty option forusers with long-term requirements.
Sixnet promises to continue to maintain each model of industrialmodem we offer for sale for a minimum of
five years, so you can design your system only once and beassured of continued supply and high-quality
after-sale service. We further promise to plan each productimprovement and new feature to be upward
compatible with existing designs and installations using thelatest modem wizard to configure the modem.
Our goal is to make each new product release better than the oneit replaces by providing new features,
increased reliability and performance, and continued support forexisting features.
Sixnet protects your investment even further with a liberalfive-year trade-in policy. You may exchange
standard Sixnet products for upgraded versions of the same orupward compatible products to take advantage
of new features and performance improvements at any time forfive years. A liberal prorated exchange
allowance will be given for your existing equipment. You maycontact Sixnet directly to trade-up on any
industrial modem product.
SIXNET INDUSTRIAL MODEM EXCHANGEALLOWANCETime Since the
Original Purchase Trade-In Allowance
0 to 1 Year 50%
1 to 2 Years 40%2 to 3 Years 30%
3 to 4 Years 20%
Over 4 Years 10%
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Sixnet Statement of Limited WarrantySixnet LLC, manufacturer ofSixnet Industrial Modems, warrants to Buyer that products, exceptsoftware,
manufactured by Sixnet will be free from defects in material andworkmanship. Sixnet' obligation under this
warranty will be limited to repairing or replacing, at Sixnet'option, the defective parts within one year of the
date of installation, or within 18 months of the date ofshipment from the point of manufacture, whichever is
sooner. Products may be returned by Buyer only after permissionhas been obtained from Sixnet. Buyer will
prepay all freight charges to return any products to the repairfacility designated by Sixnet.
Sixnet further warrants that any software supplied as part of aproduct sale, except obsolete products, will be
free from non-conformances with Sixnet published specificationsfor a period of 90 days from the time of
delivery. While Sixnet endeavors to improve the features andperformance of software associated with its
products, no effort on the part of Sixnet to investigate,improve or modify Sixnet software at the request of a
customer will obligate Sixnet in any way.
This limited warranty does not cover losses or damages whichoccur in shipment to or from Buyer or due to
improper installation, maintenance, misuse, neglect or any causeother than ordinary commercial or
industrial applications. In particular, Sixnet makes nowarranties whatsoever with respect to implied
warranties of merchantability or fitness for any particularpurpose. All such warranties are hereby expressly
disclaimed. No oral or written information or advice given bySixnet or Sixnets representative shall create awarranty or in anyway increase the scope of this warranty. This limited warranty isin lieu of all other
warranties whether oral or written, expressed or implied.Sixnet's liability shall not exceed the price of the
individual units, which are the basis of the claim. In no eventshall Sixnet be liable for any loss of profits,
loss of use of facilities or equipment, or other indirect,incidental or consequential damages.
These products must not be used to replace proper safetyinterlocking. No software based device (or other
solid state device) should ever be designed to be responsiblefor the maintenance of consequential equipment
or personnel safety. In particular, Sixnet disclaims anyresponsibility for damages, either direct or
consequential, that result from the use of this equipment in anyapplication.
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Service Information
We sincerely hope that you never experience a problem with anySixnetproduct. If you do need service, call
Sixnet at (518) 877-5173 and ask for Applications Engineering. Atrained specialist will help you to quickly
determine the source of the problem. Many problems are easilyresolved with a single phone call. If it is
necessary to return a unit to us, an RMA (Return MaterialAuthorization) number will be given to you.
Sixnettracks the flow of returned material with our RMA systemto ensure speedy service. You mustinclude this RMA number on theoutside of the box so that your return can be processedimmediately.
The applications engineer you are speaking with will fill out anRMA request for you. If the unit has a serial
number, we will not need detailed financial information.Otherwise, be sure to have your original purchase
order number and date purchased available.
We suggest that you give us a repair purchase order number incase the repair is not covered under our
warranty. You will not be billed if the repair is covered underwarranty.
Please supply us with as many details about the problem as youcan. The information you supply will be
written on the RMA form and supplied to the repair departmentbefore your unit arrives. This helps us toprovide you with the bestservice, in the fastest manner. Normally, repairs are completed intwo days.
Sometimes difficult problems take a little longer to solve.
If you need a quicker turnaround, ship the unit to us byairfreight. We give priority service to equipment that
arrives by overnight delivery. Many repairs received bymid-morning (typical overnight delivery) can be
finished the same day and returned immediately.
Sixnetpays the return freight for material repaired underwarranty. The method of outgoing shipment will be
equivalent to the way you shipped the unit to us. If you sendthe unit by air, we will return it by air.
We apologize for any inconvenience that the need for repair maycause you. We hope that our rapid servicemeets your needs. If youhave any suggestions to help us improve our service, please give usa call. We
appreciate your ideas and will respond to them.
ForYourConvenience:
Please fill in the following and keep this manual with yourSixnetsystem for future reference:
P.O. #: __________________ Date Purchased:___________________
PurchasedFrom:______________________________________________
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Additional Documents
The Sixnet Programmable I/O for WindowsCD has the followingdocuments, which provide additional
information pertaining to the VT-MODEM and its usage:
VT-MODEM Help FileThis online help system is accessed on the CDby selectingManuals and
DocumentsUser ManualsModem Help File
The following Technical Notes, in addition to others, areaccessible on the CD by selecting Manuals and
DocumentsTechnical Notes. The VT-MODEM Wizard configurations(*.6ms), mentioned in these
Technical notes, are provided in the \sixtrak directory of theCD.
TN 606 VT-MODEM Replaces an Existing 1200, 2400, or 9600-BaudModem
This document describes the settings necessary to configure theVT-MODEM to functionally
replace an existing 1200, 2400 or 9600-baud modem.
TN 620 Allen-Bradley SLC 5/03
This technical note provides instructional tips for interfacingthe Sixnet IndustrialTelephone Modem with the Rockwell SoftwareRSLinks 2.0 and RSLogics 500 and
Allen-Bradley SLC500 Processors.
TN 623 Allen-Bradley MicroLogix 1000 and 1500 PLC
The information in this document explains the procedure forinterfacing a Sixnet Industrial
Telephone Modem with an AB MicroLogix 1500 controller and acomputer running the
Rockwell RSLogix 500 programming software and the RSLINXcommunication software.
This setup will allow a remote computer to go on-line with aMicroLogix via a telephone
modem connection.
TN 641 GE Versamax Micro PLCThis document explains the procedureof dialing and establishing a communications between
a local PC running VersaPRO software and a remotely located GEFanuc VersaMAX Micro
Controller via a pair of Sixnet Industrial Modems.
TN 642 GE Fanuc 90-30 PLC
This document explains the procedure of dialing and establishinga communications between
a local PC running VersaPRO software and a remotely located GEFanuc 90-30
Programmable Controller via a pair of Sixnet IndustrialModems.
TN 640 PLCDirect DL250 PLC
This Technical Note defines the procedure for dialing andestablishing communicationsbetween a PC running Directsoft32software and a DL250 PLC via Sixnet Industrial modems.
TN 647 VT-MODEM Rev.3 changes some AT commands
This technical note describes differences between the ATcommands supported in current
and previous revisions of the VT-MODEM-1, -2 and 3 and SiteTRAK-1T. This
Technical Note is intended to aid existing customers inidentifying and dealing with
potential issues in converting to the newer revisionproducts.
FCC Requirements for Consumer Products
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The Federal Communications Commission (FCC) has establishedrules which permit this device to be
directly connected to the telephone network. Standardized jacksare used for these connections. This
equipment should not be used on party lines or coin lines.
If this device is malfunctioning, it may also be causing harm tothe telephone network; this device should be
disconnected until the source of the problem can be determinedand until repair has been made. If this is not
done, the telephone company may temporarily disconnectservice.
The telephone company may make changes in its technicaloperations and procedures; if such changes affect
the compatibility or use of this device, the telephone companyis required to give adequate notice of the
changes.
If the telephone company requests information on what equipmentis connected to their lines, inform them
of:
A) The telephone number that it is connected to,
B) The Ringer Equivalence Number 0.3
C) The USOC jack required RJ11, and
D) The FCC Registration Number 34579-MD-E
Items (b) and (d) are indicated on the label. The ringerequivalence number (REN) is used to determine how
many devices can be connected to your telephone line, In mostareas, the sum of the RENs of all devices on
any one line should not exceed five (5.0). If too many devicesare attached, they may not ring properly.
In the event of equipment malfunction, all repairs should beperformed by our Company or authorized agent.
It is the responsibility of users requiring service to reportthe need for service to our company or one of our
authorized agents.
Sixnet
Northway Ten Professional ParkPO Box 767
Ushers Road
Clifton Park, NY 12065
518-877-5173
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Industry Canada Requirements
The VT-MODEM meets the procedural and specification requirementsfor certification under the Terminal
Attachment Program.
CERTIFICATION NO.: 2991 8926 A
ISSUED TO: Sixnet
TYPE OF EQUIPMENT: MULTI-MEDIA DEVICE
TRADE NAME AND MODEL: VT-MODEM-1, VT-MODEM-2, VT-MODEM-3
METHOD OF CONNECTION: CA11A
RINGER EQUIVALENCE NO.: 0.3
CERTIFIED TO: SPECIFICATION CS03 ISSUE 8
NETWORK INTERFACE: LS
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Regulatory Notices
Any European Country:
The VT-MODEM-1 (2 and -3) EC are in conformity with relevantregulatory standards following the provisions of European
Council Directives: 73/23/EEC (Low Voltage Directive) and89/336/EEC amended by 92/31/EEC (EMC Directive).
The VT-MODEM-1- (-2 and 3) EC have been approved in accordancewith Council Decision 98/482/EC for pan-European
single terminal connection to the public switched telephonenetwork (PSTN). However, due to differences between theindividual
PSTNs provided in different countries, the approval does not, ofitself, give an unconditional assurance of successful operationonevery PSTN network termination point. In the event of problems,you should contact Sixnet in the first instance.
The VT-MODEM-1 (-2 and 3) EC shall be connected to theTelecommunication Network through a line
cord, which meets the requirements of Australian CommunicationsAuthority (ACA) Technical Standard
TS008. An Australian Approved Power Supply or AC Adapter shallbe utilized with the product.
AS/NZS3548:1995-
WARNING: This is a Class A product. In a domestic environment,this product may cause radio interference, in which case the
user may be required to take adequate action.
Germany:
Diese VT-MODEM-1(-2 and 3) EC als Endeinrichtung vorgesehen undmuss an ein TAE mit F-Kodierung angeschlossen
werden.
(This VT-MODEM-1(-2 and 3) EC is a terminal equipment, whichmust be connected to the PSTN using an F-coded
connector/plug.)
IEC950:1991-
The Industrial Modem shall be connected to TelecommunicationsNetwork through a line cord approved by the necessary
authorities of the country. The Industrial Modem shall beutilized with a power supply approved by the necessary authoritiesof
the country.
United Kingdom:The VT-MODEM is intended for direct connection tothe analogue Public Switched Telecommunications Network and is
approved for use within the United Kingdom with followingfeatures:-Modem facility
-Autocalling facility
-Autoanswering facility
-DTMF signaling
CAUTION: The analogue telecommunications interface of theVT-MODEM is intended to be connected to Telecommunication
Network Voltage (TNV) circuits, which may carry dangerousvoltages. If it is subsequently desired to open the hostequipment
for any reason, the telephone cord must be disconnected prior toeffecting access to any internal parts, which may carry
telecommunication network voltages.
Service can be facilitated through our office at:
Sixnet
Northway Ten Professional Park
PO Box 767
Ushers Road
Clifton Park, NY 12065 USA
518-877-5173
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