56033504 © 2007 Telular Corporation
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2.2 C/C COMMUNICATION FORMATS
The Telguard reads the C/C’s alarm messages and converts the C/C’s Ademco Contact ID, SIA2, 4x2 or 3x1
with 1400Hz or 2300Hz handshake data format into SMS packet data protocol for transmission over the
cellular radio network. In order for the C/C to be compatible with the Telguard, the C/C must be programmed
to transmit alarm messages to the central station using one of the following non-extended formats:
• Pulse Formats:
o 3+1 pulse; 10pps, Double Round, 1400Hz ack
o 3+1 pulse; 20pps, Double Round, 2300Hz ack
o 3+1 pulse; 40pps, Double Round, 2300Hz ack
o 4+2 pulse; 20pps, Double Round, 1400Hz ack
o 4+2 pulse; 20pps, Double Round, 2300Hz ack
o 4+2 pulse; 40pps, Double Round, 2300Hz ack
• Ademco Contact ID
• Radionics Modem IIe or IIIa
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• SIA2 (SIA-DC-03 level 2 release at 300 baud)
• DMP
Hexadecimal account numbers (001-FFF or 0001-FFFF) can be used with 3+1 or 4+2 formats, but Contact ID and
Radionics requires a four digit account number using digits 0-9 (0001-9999).
2.3 COMPLETE SUPERVISION OF COMMUNICATION PATHS
The Telguard continuously supervises both the primary (telco) and the secondary (cellular) communication paths.
If either path becomes inoperative, the Telguard generates a relay trip output that can be connected to a zone
input of the host control communicator and/or used to activate remote sounding devices.
2.3.1 Line Fault Condition (LFC)
The Telguard monitors voltage on the incoming telco line. If an inoperative telco line is identified, (voltage
below –20vdc, on hook) a telco line fault condition (LFC) is declared. The System Trouble Condition LED
(STC LED) will flash 3 times and the STC relay will trip after a 30 or 60 second programmed delay. Upon
telco restoral, the relay and STC LED are returned to normal.
2.3.2 No Service Condition (NSC)
Telguard declares a no service condition (NSC) when the measured “receive” cellular radio signal
strength at the protected premises drops to -114 dBm or less. NSC is programmable to trip the
supervisory relay output (STC2) after a 30 or 60 second delay. When STC trips, the STC LED will flash 4
times. Restoral of this condition occurs when a measurable signal strength greater than –114 dBm is
maintained for the trip period of 30 or 60 seconds.
2.3.3 Radio Communications Failure Condition (RFC)
Radio communications failure condition (RFC) is declared when Telguard is unable to transmit over the
cellular network even with acceptable signal strength. RFC is indicated by STC LED flashing 5 times.
2.4 COMPLETE POWER SUPERVISION
Telguard monitors its backup battery as well as its AC power source and reports power conditions from either.
Telguard’s integrated control and power module incorporates a battery charging circuit. This battery charger
circuit is also monitored.
2.4.1 Low/Missing Battery Condition (LBC)
The Telguard checks the backup battery voltage on initial power-up and every 60 seconds thereafter. If
the battery voltage changes from ‘good’ to ‘bad’ state and is less than 11.6 volts, a LBC is declared
whereby the STC LED blinks twice (every 5 seconds) and the STC relay trips. When the battery voltage
increases to 12.1 volts, the STC LED and STC relay restore. Telguard also indicates Low/missing Battery
Condition (LBC) when battery charger fails.
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