Functions
INSYS GSM 4.3
12.17
Alarm Inputs
The INSYS GSM 4.3 has two digital inputs, which can trigger an “alarm” when
connected to GND. When an alarm occurs, the INSYS GSM 4.3 can send a mes-
sage either via a data connection or SMS, or establish a voice connection.
The INSYS GSM 4.3 will evaluate a connection of the input to GND as a pulse. This
will only consider a falling edge. Two “pulse types” are available: “simple pulses”
and “count pulses”, i.e. a pulse sequence. If no rising edge is detected for at least
4 seconds, a “simple alarm” is processed. The INSYS GSM 4.3 can react on this
event with the dispatch of a single message or the establishment of a voice con-
nection. “Count pulses” are periodic connections to GND, which do not last longer
than two seconds. The length of a pulse or the pause respectively can have a dura-
tion between 0.3 and 2 seconds. The complete evaluation of several pulses is per-
formed after a pause of 5 seconds (refer to Figure 8 Duration of inter-pulse peri-
ods). Depending on the number of count pulses, the INSYS GSM 4.3 addresses the
messages 1 to 10 and sends it to the respective recipients. Up to 5 alarms are buff-
ered at the inputs and processed consecutively.
Figure 8 Duration of inter-pulse periods
The sent messages consist of the collective message and the according message 1
to 10. It is thus possible to specify the system with the collective message and to
specify the reported system part in the pulse message. Moreover, a message can
be sent to up to 20 recipients.
For control purposes, simple and pulse alarms may be triggered via AT commands.
The status of the alarm inputs can be queried by AT commands or via DTMF tones.
Configuration with AT commands
In order to request the input states, use the
command
AT**IN?
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