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Westermo - 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.

TDW33 Telephone Modem
TDW33 Telephone Modem

Features Include:
  • Extended temperature range –25C to +70C
  • Data rate up to 56 kbit/s (V90)
  • Terminal rate up to 115.2 kbit/s
  • DTR and incoming data dialling
  • Watchdog
  • Secure call back and access
  • Industrial environment transient protection on all interfaces
  • Up to 11 data bits
  • Tri-Galvanic isolation (interface/line/supply)
  • Caller ID presentation and answering
  • Remote configuration
The TDW-33 is designed to function reliably within industrial environments and in areas of high level interference. The modem has an RS-232 interface supporting terminal data rates up to 115-kbit/s. The TDW-33 is a V.90 modem meaning that it can support data rates of up to 56 kbit/s on the PSTN line side. The modem is equipped with transient protection on the line side and a “watchdog” that monitors and automatically resets the modem in the event of a fault. These functions together with remote configuration make the modem perfect for installation at unmanned sites and prevent the need of costly service trips. The modem also has password protection, dial-back security and caller ID answering to ensure that only authorised users can communicate with the modem and any connected equipment. The TDW-33 is ideal for industrial applications as it mounts easily on to a 35 mm DIN-rail, runs from 12–48-VDC power supplies, has screw terminal connections and is tri galvanically isolated. For ease of setup the modem is supported by the Westermo TD-tool configuration software. Drivers for Windows setup are also supplied.
Part Number Description List Price (1 pc) Purchase
TDW-33 Telephone Modem with RS232 port - UL $405.00
 Contact ESI to assist in specifying product and for quantity pricing.
Remote Configuration:
TDW-33 - Data Sheet
TDW-33 Manual
AT Commands Manual


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