Sur-Gard SG-DV4420, Руководство пользователя

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16
PROBLEM, SYMPTOMS SOLUTION, ACTION
6. If all the above checks indicate that the panel and wiring
are correct, and the SG-DVT1 cannot communicate with
the central station, contact your telephone company.
Advise the company technician of any action taken so
far. Request that the telephone company verify the
following:
n
The leg on status
n
Hub options
n
Loop back test
n
Receiver polling seen on leg
n
Control panel answering polling
Your tests above will give you an indication of what
to expect. For example, If the panel Tx led shows no
activity, you won’t expect the telephone company to
see the panel answering the polling!
7. If there is some, but unsatisfactory communication, have
the telephone company measure the distortion on the
leg. Each bit transmitted should be near 6.6mS long.
Distortion can cause bits, eg: spaces or zeros, to be
shorter and be incorrectly sampled, causing rejection of
the data. If you have the equipment and know-how,
check this yourself before calling the telephone company.
8. Check the software version of the panel, newer
programs may have some improvements to work on
higher distortion lines.
Panel sends ID ok, does not always respond to
status report requests, or does not send alarms
or other longer transmissions, or, receiver has
periods of incorrect response for this subscriber.
A1 or A2 Fire/Trouble LED on. Verify the class a loops A1 and A2 wiring: + to + , - to
- (see connection diagram page 6).
TROUBLE SHOOTING