If the RS-232 connection between a datalogger and a Raven XT-series modem works fine, but the CS I/O connection does not work, what might be the cause?

To connect the modem to the datalogger’s CS I/O port, either the SC932A or the SC105 must be used.  This communication also depends on the configuration of the ports on the modem and datalogger (PPP versus serial server); the two must match.

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