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This table is also printed on the board.
The IRQ used for the modem is set in section IRQ_A. Place one jumper in this section to select an
IRQ number in the interval IRQ3 to IRQ15.
SIM card
The SIM card connector (CN9) is placed on the rear side of the module. A SIM card must be placed
in this connector in order to establish a wireless communication.
Modem AUX connector CN3
The modem has a built-in interface for simple non-isolated digital and analogue channels. This
includes:
• Four digital inputs
• Three 8-bit ADC inputs
• One 8-bit DAC output
The table shows the connector layout:
The protection circuitry between the modem and CN3 is shown here.
These I/Os are operated by AT commands in the modem.
ST1 Base address
1 2 3 COM_A
0 0 0 Disabled
0 0 1 2C8
0 1 0 2D8
0 1 1 2E8 (COM4)
1 0 0 2F8 (COM2)
1 0 1 3D8
1 1 0 3E8 (COM3)
1 1 1 3F8 (COM1)
Pin no Name Signal name in modem Pin no CDB-9F
1 GND 1
2 DAC DAC 6
3 ADC #3 ADC3 2
4 ADC #2 ADC2 7
5 ADC #1 ADC1 3
6 Digital input #4 IO4 8
7 Digital input #3 IO3 4
8 Digital input #2 IO2 9
9 Digital input #1 IO1 5
10 NC
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