
MIX Modem - GSM
User Manual V.1.1
Pag. 13
Subject to change without prior notice
3. ELECTRICAL DESCRIPTION
All electrical connections to the module are protected in compliance with the standard air and contact
Electrostatic Discharge (ESD).
The module uses the following industry standard connectors:
•
D-Sub 9 pin female (Main RS232 serial port)
•
High density 15 pin D-Sub(Secondary RS232 UART and extended I/O interface)
•
RJ12 6-way (power supply connector)
•
RJ12 4-way (handset connector)
•
SIM card reader
•
FME male coaxial jack (antenna connector)
3.1 Power Connector
An RJ12 6-way connector, as shown and described below, serves means of supplying and controlling
d.c. power to the modem.
The supply voltage, VCC, required by the modem is in the range 6-32V d.c. The power supply has to
be a single voltage source capable of providing a peak during an active transmission. The uplink burst
causes strong ripples (drop) on the power lines.
Application of the supply voltage does switch the modem on.
Automatic restart after shutdown:
This allow to an application to be always switched on resp. to be able to restart by itself.
The terminal will not need external ignition to be powered up.
The terminal will be powered up 100% time if power is applied. The only way to shut down the
terminal is applying continuously positive signal in pin 3 of J1 RJ11 power connector.
The powered up with a RTS Pulse has been removed.
An active-high control signal, TURN_OFF, can be used to switch modem off when continuously applied,
or can be used to perform hardware reset when applied for > 3.5s.