18
4
Electrical Description
The modem uses the following standard connectors:
RJ11 6-way (power +IOs)
Mini USB (for data)
SIM card holder
FME male coaxial jack (antenna connector)
Sub-D female socket, 9 pin (RS232 serial port)
4.1
Power Connector
An RJ11 6-way connector, as shown and described below, serves as a means of supplying and controlling
DC power to the modem. The use of an external power supply is necessary as the USB port is not intended
to be used as power source.
2
The supply voltage VCC required by the modem is 5V - 32V DC. Please note that applying the supply
voltage does not switch the modem on. To do so an additional active-high control signal, TO_IN, must be
applied for > 1 second.
Please see chapter 5.1 Switch ON the modem for further important details about TO_IN and power supply
requirements, especially if TO_IN is applied in parallel to VCC.
VCC and GND are reverse-polarity and over-voltage protected as long as the antenna
interface and the user’s application are not used or connected to separate grounds.
Figure 4: RJ11 Pin Connector
PIN
Signal
Direction
Limits
Description
1
VCC
Input
5 – 32V
Positive power input, DC
2
ADC_IN
Input
0-32V
Analogue Input
2
This Statement does not apply to the USB Host Powered version of the GT910 G.
