Audiotel BASE Manual Del Usuario página 35

GSM/GPRS INDUSTRIAL MODEM
SWITCHING ON/OFF THE MODEM (valid only for INDUSTRIAL PLUS and I/O)
The microcontroller installed on the Industrial PLUS and I/O allows You to switch on the
modems simply furnishing them the power supply (refer to pin 1 and 2 of the 4 pins
Microfit connector if using the Industrial PLUS; refer to pin 1 and 2 of the 18 positions
terminal board if using the Industrial I/O).
Removing the power supply is the way to switch off the modem.
SWITCHING ON THE MODEM (valid only for INDUSTRIAL BASE)
Simply applying supply voltage, on the 4 pins Microfit connector, (Power IN to pin 1
and GND to pin 2) alone is not enough to switch on the modem. It can be switched on
in two different ways:
Using the Ignition signal (IGN)
The Ignition signal (IGN) have to be kept in a high level state, for at least 500msec,
at the same time of the power supply Power IN (see the timing diagram below).
For example it is sufficient to connect, in the power supply cable contained in the sale
package, the Ignition signal to the Power IN line (yellow wire with red wire) in order
to switch on the modem. This connection could be maintained for a indefinite period
of time (see picture below).
Red wire
Yellow wire
Black wire
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