COM220 Land Line Phone Modem

The COM220 modem enables communications between a computer and a Campbell datalogger via a public switched telephone network.

A Hayes-compatible modem is required at the base-station computer while a COM220 connects to the datalogger at the field site. The COM220's wide operating temperature range and minimal power requirements make it ideal for use at remote sites. A surge protector to help suppress incoming electrical transients carried down the phone line is strongly recommended. Features Improvements over its predecessor, the COM210, include:

  • Supports communication rates up to 115.2 kbps between modem and logger. (In practice, data transmission through phone lines is generally constrained to 33.6 kbps.)
  • Offers both modem enabled (ME) and synchronous device communications (SDC) modes.
  • Allows user to set the number of rings before answering call.



  • Weight: 0.16 kg
  • Dimensions: 16.5 x 2.5 x 6.6 cm
  • Standard Operating Temperature Range: -25° to +50°C
  • Extended Operating Temperature Range: -55° to +85°C


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