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Troubleshooting
Q. What if there appears to be random triggering of the DualCom ?
Ensure that 0 volts is common across all parts of the alarm system.
If the DualCom receives its power from a Power Supply that is additional
to the alarm system, ensure that the 0 volt connection on the additional
power supply is connected to the 0 volt connection on the alarm system.
Q. What if the Digital Communicator signal is not received by the Alarm
Receiving Centre ?
Check that the NVM is fitted and has been correctly programmed, i.e. PSTN
enabled, correct telephone numbers.
Check that the PSTN line is properly connected. Check with a meter that
approximately 50 volts DC is present across the PSTN terminals marked A
and B. Connect a telephone to the PSTN line and make a call to ensure
that it is fully functional. Remove telephone after test.
Ensure that 'call barring' to the ARC Receiver telephone number has not
been set on the PSTN line used by DualCom by using a phone and dialling
to the ARC receiver(s). Remove telephone after test.
Disconnect any other equipment that is using the same PSTN line to en-
sure that it is not inhibiting the DualCom.
Check that when the DualCom is triggered, the voltage across the A and B
terminals drops to between 6 and 12 volts DC.
See Appendix 1 for Line Monitoring indications. These will help diagnose
line problems.
Q. The Fault Relay does not operate so that EN Standards can be met ?
Where the installation is specified to the EN 50131 and PD6662 standards
then use of the DualCom GPRS is recommended.
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