Chapter 7: Service and troubleshooting
182 EST3X Technical Reference Manual
3. Hear the receiver ringing
4. Hear the CMS receiver go off-hook and send a handshake tone
Typical problems dialing the CMS involve missing or incorrect area codes, the
need to dial 1 for long distance, or missing line access codes (for example,
dialing 9 for an outside line).
If the receiver answers, check that it is sending out the correct handshake. For
SIA P2 (3/1 pulse), SIA P3 (4/2 pulse), and SIA DCS the receiver should send a
single tone of 0.5 to 1.0 seconds in duration. For Contact ID, the handshake
signal consists of two short tones of different frequency. For TAP, there should
be a modem-type exchange of handshake messages.
If the receiver sends the correct handshake and the 3-MODCOM transmits data
but the receiver does not send an acknowledgement, check that the receiver is
compatible with the desired protocol. (SIA DCS, P2, and P3 standards are
available from the Security Industry Association). Typical problems involve an
incompatible format or data message.
If the handshake and acknowledge signals are audible, check that the correct
account number was configured in the 3-MODCOM and the code being sent was
correctly programmed in the CMS computer.
Where a 3-MODCOM module is suspected of being faulty, try substituting a
known good one that has been properly programmed.
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