31
OPERATING PRINCIPLES
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External Alarm Lines
The GTCOM has 8 External Alarm lines that allow detection of 16 events. The
8 External Alarm lines are connected respectively to terminals
L1,L2,L3,L4,L5,L6,L7 and L8.
The External Alarm lines are activated by applying the power supply voltage
(approx. 12 V) or Negative to terminals L1......L8.
Activation will occur on the edge of the applied signal, that is, when the voltage
rises from 0 V to 12 V (rising edge), or drops from 12 V to 0 V (falling edge).
The trigger signal edge can be specified during the Programming phase, by
selecting ‘YES’ in the option box that corresponds to the Telephone number to
call.
If ‘YES’ is selected in the option box that corresponds to the ‘Alarm Line....’
events, activation will occur on the rising edge of the signal applied to the Input
line (refer to
Programming
/
Channels
).
If ‘YES’ is selected in the option box that corresponds to the ‘Reset Alarm
Line....’ events, activation will occur on the falling edge of the signal applied to
the Input line (refer to
Programming
/
Channels
).
If no event codes are programmed, or if no telephone numbers are assigned to
the external alarm lines, the GTCOM will not perform the call cycle.
All the external alarm lines (L1......L8) are connected internally by a resistor,
either to negative (pull-down) or to a supply voltage (pull-up), depending on the
position of jumper 4 (see the following figure). Position the jumper as per
requirements.
IMPORTANT: JUMPER 4 MUST BE UTILIZED, OTHERWISE, THE GTCOM
CANNOT OPERATE PROPERLY .
Activation
Input Trigger
Ø
Ø
Pull-Up
or
Pull-Down
OPERATING PRINCIPLES
