VEGA INSYS Modem GPRS 5.0 - Manual (Page 68)

Functions INSYS GPRS 5.0 serial
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6.7 Digital Inputs and Potential-Free Outputs
The INSYS GPRS 5.0 serial has digital inputs and outputs. The outputs can be switched via
AT commands to control external functions. The inputs can be used to trigger an action
of the INSYS GPRS 5.0 serial. The inputs can be used to dial a connection to an AutoDial
destination or to send an SMS. The action is triggered through a change of the input
from HIGH (inactive) to LOW/GND (active). The level change is accepted after 0.3 sec-
onds, i.e. the input is debounced. In addition, there is the possibility for IO tunneling, i.e.
transmit the input states via a TCP connection to another INSYS GPRS 5.0 serial or a
server.
6.7.1 Automatic SMS dispatch via the switch input
Note
To enable the automatic sending of SMS messages, the device must
know the number of a SMS service center. Make sure that the ser-
vice center number is entered and stored in the device via AT com-
mands.
The INSYS GPRS 5.0 serial can send a predefined SMS via a level change of the digital in-
puts UI. The SMS is triggered through the connection of the input with ground (GND).
The alarm input is on HIGH potential by a pull-up resistor in open state (inactive).
The SMS is triggered through a change of the input from HIGH (inactive) to LOW/GND
(active). The level change is accepted after 0.3 seconds (debounce).
To resend the SMS, the input must be set to HIGH (inactive). If the input state at both
inputs changes at the same time, the input state 1 will be evaluated first. If the state
changes at the other input while a state change at one input is being processed, the
event is stored and processed later.