
Chapter 1
Multi-Tech Systems, Inc. MultiModem iCell User Guide 11
GPIO (General Purpose Input/Output) Connector
The GPIO pins are configured using Universal IP (UIP) AT Commands. Refer to the Universal IP (UIP) AT Command
Reference Guide on your MultiModem CD. The following table explains the GPIO functions:
Pin 1 DIO 0
Pin 2 DIO 1
Pin 3 DIO 2 / ADC 0
Pin 4 DIO 3 / ADC 1
Pin 5 ADC 2
Pin 6 Gnd
The GPIO pins can be configured independent of each other.
● Pin 1 Digital Input, 24 Volt tolerent.
● Pin 2 Digital Input, 24 Volt tolerent.
● Pin 3 can be configured as either Digital Input (5V tolerant TTL/CMOS levels) or Digital Output (3.3V High) or as an
ADC input (0 to 3.3V rail)
● Pin 4 can be configured as either Digital Input (5V tolerant TTL/CMOS levels) or Digital Output (3.3V High) or as an
ADC input (0 to 3.3V rail)
● Pin 5 is configured as an ADC input (0 to 3.3V rail)
● Pin 6 is GND and must be connected to the ground of the attached device
GPIO DC Characteristics
Pins 1, 2
Input Voltage
Pins 3, 4
Input Voltage
Pins 3, 4
Output Voltage
Output High-level Voltage
Pins 3, 4
Output Current
Pins 1, 2 are digital input only.
Pin 5 is an analog input only.
Pins 1-5 contain ESD protection.
RS232 9-Pin Functions of the Female End Connector
Female Connector
Signal IN/OUT
Pin 1 CD O
Pin 2 RX O
Pin 3 TX I
Pin 4 DTR I
Pin 5 GND --
Pin 6 DSR O
Pin 7 RTS I
Pin 8 CTS O
Pin 9 RI O
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