Stafford, Texas

VT-MODEM, Rugged Industrial Phone Modem

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VT-MODEM, Rugged Industrial Phone Modem


Sixnet VT-MODEM Series features Industrial Telephone Modems that eliminate the difficulties encountered with installing office-grade modems in industrial settings. These ruggedized modems connect to any PLC, RTU, or other industrial equipment and provide the important features you have been looking for.

  • Rated for -30° to +70°C operation
  • Proven in the toughest settings from pipelines in Alberta to remote locations in Sweden
  • DIN Rail or flat panel mounting
  • DC powered – No more bulky AC adapters
  • Supports all PLCs, RTUs and other devices
  • Compliant with telephone systems world-wide


Sixnet VT-MODEMs are rugged industrial telephone modems that have been designed for operation in electrical enclosures installed in harsh environments. Each VT-MODEM supports all standard Hayes AT commands, Fax Class 1and Class 2 commands and S-registers and therefore can be set-up as an external modem on any PC. The VT-MODEMs are compatible with any telecommunications or dial-up networking software.

A VT-MODEM allows easy access to PLCs, Sixnet I/O, and other devices via dial-in telephone connections. The modem may be DIN rail or panel mounted for convenient and easy installation adjacent to other DIN rail components inside of new or existing enclosures. Most Windows 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 sites for data retrieval or diagnostics.

NOTE: All VT-MODEM models communicate over analog phone lines only.

Rugged Industrial Phone Modem Features

Telephone Lines
  • Max. data rate 33.6 kbps for -1
  • Compatibility V.90, V.92 (-5 only); V.34, V.32 bis, V.32, V.22,
  • V.22A/B, V.23, V.21, Bell 212A and 103
  • Data compression V.44; V.42 bis, MNP 5
  • Error correction V.42 MNP 2-4
  • Max. fax rate 14.4 kbps for -1
  • Fax capabilities V.17,V.29/V.27/V.21, FClass 1,1.0 (-1,-2,-3)
  • Ringer and jacks 0.3 and RJ11 (line and auxiliary)
RS-232 Port
  • Max. RS-232 Rate 115.2 kbps for -1
  • RS-232 (DCE) TD, RD, CTS, RTS, CD, DTR, DSR, RI, GND
  • Command Set standard AT and S register
  • Status LEDs CD, DTR, RD, TD, Power
​General Characteristics
  • Input voltage 10-30 VDC for -1
  • Input current @ 24 VDC (typical)
  • 50 mA (Sleep mode 30 mA)
  • Operating Temp. -30° to 70°C (Storage: -40° to 85°C)
  • Humidity 5% to 95% RH (non-condensing)
  • Flammability UL 94V-0 materials
  • Telecom Ratings FCC part 68, Industry Canada CS03-8,
  • CTR21 (98/482/EC); ACA TS 001; ACA TS 002
  • Electrical Safety UL 508, CSA C22.2/14; EN61010-1 (IEC1010), IEC 950, AS/NZS3260
  • EMI emissions FCC part15, ICES-003, Class A; EN55022; AS/NZS3548
  • EMC immunity EN50082-1 (IEC801-2, 3, 4)
  • Vibration IEC68-2-6
  • Hazardous locations (Zone 2) UL1604, CSA C22.2/213 (Class I, Div 2, Groups A, B, C, D); Cenelec, EN50021 (EEx nA II T4)
  • DIN-rail or panel mounting

VT-MODEM from Sixnet / Red Lion Model Line Up

  • VT-MODEM-1 – Workhorse for general industrial applications. Supports baud rates up 33.6K (V.34)
  • VT-MODEM-2 – Can automatically dial out on a contact closure from any PLC or other device
  • VT-MODEM-3 – Features RS422/485 port in addition to the RS232 port. Accepts power up to 52 VDC

NOTE: All modems include a RS232 modem cable (DB9) and complete Windows software.