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at power voltage of +12 V
– 60 mA;
at power voltage of +24 V
– 30 mA.
GPIO 1 and 2 in the "input" mode:
Resistance of the programmable pull-up to power voltage
– 10 kΩ;
Programmable pull-down resistor
– 47 kΩ;
Maximum "0" level voltage (low level)
– 0.8 V;
Minimum "1" level voltage (high level)
– 2.0 V;
Maximum allowable input voltage
– 40 V.
GPIO 2 in the “input” mode set as ADC:
Current measurement parameters:
Current measuring range, mA: 0 to 30;
Current measurement error, mA:
0.2.
Voltage measurement parameters:
Voltage measuring range, V: 0 to 40;
Voltage measurement error, V:
0.2.
GPIO 1 and 2 in the "output" mode:
Output type
– open collector to ground;
Output resistance
– 120 Ω;
Maximum output current
– 10 mA.
GPO 3 in the "output" mode:
Output type
– open collector to power voltage;
Output resistance
– max 2 Ω;
Maximum output current
– 500 mA.
2.7. GSM Module Specifications
Bandwidth:
900/1800 MHz;
850/900/1800/1900 MHz (optional)
Transmitter output power:
at frequency of 850/900 MHz
– 2 W;
at frequency of 1800/1900 MHz
– 1 W;
2.8. Device Functional Circuit
The modem main components: