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« The equipment has an active communication port which
conflicts with that of the modem (as for example for use with a
mouse). This must be rectified.
e Some terminals require that the carrier wave is functioning
prior to being able to communicate with the modem. If this is
the occasion with your terminal, then this must be reset in
order that the above tests can be carried out.
e There is a physical failure in a cable, the modem or the
computer's communication port etc. (Assume that this is not
the case until otherwise confirmed).
It can be something of a task to find out exactly what lies behind
a physical or mechanical error in the system. The main rule is to
attempt to eliminate possible sources of failure one by one,
assuming you have the possibility to do this. For example:
e Substitute the cable with one you know to be in order.
Alternatively try out the cable on a system you know to be in
order. Then try again.
If this does not help, then replace the modem with
one you know to be in order. Is this now functioning
Ok, next step, and so on.
Enter SATL
to set the modem over to HAYES command status.
2-13
Zat 14.4/14.4-7 and Zat 19.2/19.2-7
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