Campbell Scientific COM220 56k Phone Modem - Manual (Page 15)

COM220 Telephone Modem
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3.4 Telephone to MD485 or Telephone to RF Systems
Telephone-to-MD485 or telephone-to-radio configurations can be utilized for
communicating with multiple dataloggers through one telephone line. For
telephone-to-MD485 or telephone-to-radio communications (with no
datalogger router), the COM220 should be set for ME mode. The COM220
and MD485 should be set to the same baud rate. When using a PakBus
network with a datalogger configured as a router, the COM220 can be set for
SDC7 and the radio for SDC8, or vice versa. Contact a Campbell Scientific
application engineer for more information. In addition, Appendix A.4.4,
Example Programs for Data-Callbacks via a CR1000 Datalogger Router,
includes example programs for both a router datalogger and a remote
datalogger communicating by telephone to MD485 or telephone to radio.
3.5 Telephone Service
If you have any questions about your telephone line, such as how many pieces
of equipment you can connect to it, the telephone company will provide this
information upon request. If the telephone company requests information
concerning the equipment which you have connected to your telephone line,
the FCC registration number and the ringer equivalence number (REN) of the
COM220 are listed on its label. Additional technical information from the
FCC and IC on the COM220 is available in Appendix D, FCC Warning to
Users of Class B Computing Devices, and Appendix E, IC Information,
respectively.
If the telephone company does not provide phone-line surge
protection, a Campbell Scientific surge suppressor should be used.
Refer to Section 3.6, Connecting to a Surge Protector, for more
information.
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