Telephone Modems
This product group consists of modems that can be connected to the public telephone network. The modems are approved in most European countries and in many countries in other parts of the world.

Westermo modems are designed for industrial applications, which means that there are functions built in to them that are especially useful in industrial systems like for instance PLC connection mode and DIP switch settings. The Westermo products have a watchdog function and are galvanically isolated to give reliable communication in harsh environments. Some of the modems can also be used on 2- or 4-wire leased lines over very long distances. We also have modems that can be used for long distance multidrop applications.
TD-23 Leased Line Telephone Modem
  • 2 / 4 wire leased line modem V.23
  • Number of multidrop points,16 (typical value)
  • Data rate 1200 bit/s (V.23)
TD-29 Multi-Drop Modem
  • Point to point or multidrop applications
  • RS-232 and RS-422/485 interface
  • Transmission rate up to 19 200 bit/s
  • For fieldbus applications i.e. Profibus
TD-29P Multi-Drop Modem
  • Allows PROFIBUS communication to remote applications
  • Half duplex communication on 9 600 bit/s and 19 200 bit/s
  • Dip switch configuration
TDW-33 Telephone Modem
  • Data rate up to 56 kbps
  • Secure Callback
  • Remote Configuration
  • RS-232 Interface
  • PSTN Telephone Jack
TD-36 RS-232 Telephone Modem
  • RS-232 interface
  • 2-wire leased line
  • Data rate 33.6 kbps
  • PSTN Telephone Jack
  • Secure Callback
TD-36 RS-485 Telephone Modem
  • RS-232 and RS-485 interface
  • 2 / 4 wire leased line
  • Data rate 33.6 kbps
  • PSTN Telephone Jack
  • Secure Callback
TD-36 485
TR-36 Rack Mount Telephone Modem
  • Rack based modem
  • Data rate up to 33.6 kbps
  • 2 / 4 wire leased line
  • RS-232 and RS-485 interfaces

TR-36B PSTN and Leased Line modem

  • Rack Based Modem
  • RS-232 and RS-422/485 interface
  • Secure call back and access
  • DTR and incoming data dialling

RV-07B 19" Modem Rack

  • Holds up to 16 TR-36B modems
  • Redundant power supply and fault relay

Telephone Modem Selection Guide:

POTS Selection Guide