COM220 Phone Modem
COM220 Phone Modem

The COM220 phone modem enables communications between a computer and a Campbell Scientific data logger over a public switched telephone network. A Hayes-compatible modem is required at the computer site. The COM220 connects to the data logger at the field site. Most Campbell Scientific data loggers are compatible.

The COM220 has a CS I/O port, power terminals, screw terminals, and an RJ-11C jack. The data logger connects with the CS I/O port via an SC12 or SC12R-6 cable. The RJ-11C jack is for attaching a surge-protected telephone line. Alternatively, the screw terminals (GND, RING, TIP) can be used to connect the COM220 with a phone line via a surge protector.

Transmission Distance or Area Worldwide
Operation 1200 to 115200 baud digital communications over phone lines
Operating Voltage 12 Vdc
Current Drain
  • ~120 μA (quiescent)
  • ~30 mA (active)
Communication Rate 9600, 38400, 57600, 115200 bps (between data logger and COM220, and selected by user)
Operating Temperature Range -25° to +50°C (standard)
Standards V.92, K56Flex, V.90, V.34, V.32bis, V32, V23, V22bis, V22, V.21, B212, B103
  • FCC US 3A4M508BSM2-T-W
  • IC 2377 A-SM2TW
  • TBR21
Service Requirements If not available at the site, phone lines must be installed.



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