When you use the -h option it is telling
Citect to not transmit out the serial port unless DCD is set. You
must also setup your modem so that it controls the state of DCD.
The modem should set DCD to indicate the state of the carrier
signal between the two modems. Your modem may default to setting
the DCD in the ON condition disregarding the state of the carrier
from the remote modem. In this case Citect will keep polling the
modem with the -h option. Check your modem documentation for
details on how to enable this option.
You should also check your cable to make sure that the DCD is
wired correctly between the modem and the serial port. If you have
a serial cable test device you should check the state of DCD and
make sure it is only ON when a remote modem has attached.
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