Electrical Connections, Power Connector

Electrical Connections

All electrical connections to the GM29 are protected in compliance with the standard air (4 kV) and contact (8kV) discharge ESD tests, of EN 301 489-1.

The modem uses the following industry standard connectors:

•RJ11 6-way (power connector)

•RJ9 4-way (audio connector)

•SIM card reader

•FME male coaxial jack (antenna connector)

•Sub-D socket, 9 pin (RS232 serial port)

Power Connector

An RJ11 6-way connector, as shown and described below, serves as a means of supplying and controlling d.c. power to the modem.

Connect positive power to VCC (pin 1) and the ground or negative to GND (pin 6). VCC and GND are reverse polarity and overvoltage protected

NOTE! Application of the supply voltage VCC, does not automatically switch on the modem.

Switch on is usually achieved by use of the TO_IN signal, which can be supplied by the host application. Alternatively the modem can be switched on at the same time that power is applied by hard-wiring TO_IN to VCC. Refer to “Switching On the Modem” on page 10 for information on switch on methods.

Similarly the host application can be designed to switch off the GM29 or perform a hard reboot of the modem's software by use of the HR_IN signal. Refer to “Switching Off the Modem” and “Resetting the Modem” on page 10 for additional information.

TO_IN and HR_IN are referenced to GND.

RJ11 Power Connector

1 VCC		3 HR_IN	5 n/c
2 n/c		4 TO_IN	6 GND

Signal	Description

VCC	Positive power input
	(5V to 32V d.c. at 1.5 Amax)
TO_IN	Active high control line used for
	switching on the modem
	(–0.5V to 32V;
	VIH > 5V, VIL < 2 V)

HR_IN	Active high control line used to
	switch off or reset the modem
	(–0.5V to 32V;
	VIH > 5V, VIL < 2 V)
GND	Negative power (ground) input
	and return path for TO_IN and
	HR_IN

6 Electrical Connections