Telephone Modem
Model COM200
The COM200 Modem enables communication between a computer and a Campbell Scientific datalogger (CR510,
CR500, CR10(X), 21X, CR23X, CR5000, or CR7) over a public switched telephone network. A Hayes-compatible
modem is required at the computer; the COM200 is connected to the datalogger. The COM200's wide operating
temperature range and low power requirements optimize it for use in remote applications.
PC208(W) Software for the IBM® PC computer supports error-checking, manual or automated dialing, and can
run unattended to take advantage of lower off-hour telephone rates.
We also offer cellular transceivers and voice-synthesized modems; contact Campbell Scientific for additional
information.
Hardware Requirements
At Computer Base Station
1) User-supplied IBM-compatible computer; CSI's Model PC208(W) Software required
2) Modem cable (7026 for 9-pin serial ports, SC25PS for 25-pin serial ports, or equivalent)
3) Customer-supplied, Hayes-compatible modem at computer
4) Connection to a switched telephone network at field site
At Datalogger Site
5) Telephone Surge Protector at each datalogger site (if the telephone company has not installed
surge protection)
6) COM200 Modem at each datalogger site; telephone line connected to COM200 by RJ-11C phone jack or
screw terminals
7) SC12 cable, provided with COM200; the more rugged SC12R cable is available as an option
8) CR510, CR500, CR10(X), 21X(L), CR23X, CR5000, or CR7
9) Field use requires ENC 12/14 or ENC 16/18 enclosure
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unacceptable interference to radio and TV reception requiring the operator to take
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