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Description of I/O interfaces:
- DB15 expansion connection: 3 digital inputs (2 of them pulse counters), 2 digital outputs and 2 A/D conversors (0-50V in tension mode, 0-20mA in current mode)
- Serial interfaces: 1x RS232 (DB9), 1x RS232 (DB15)
- Relay: 1x internal relay 6A (220Vac). Accessible from terminal block
- MTX-Tunnel software uses these inputs/outputs as follows:
GPIO | LOCATION | PIN | I/O | FUNCTION | @MODBUS |
GPIO1 | DB15 | 4 | Digital input | Wake up/pulse counter | 1/13-14 |
GPIO2 | DB15 | 11 | Digital input | SMS alarm/pulse counter | 2/15-16 |
GPIO3 | DB15 | 9 | Digital input | User/pulse counter | 3/17-18 |
GPIO4 | DB15 | 5 | Digital output | User | 4 |
GPIO5 | DB15 | 12 | Digital output | User | 5 |
GPIO6 | Terminal block | 1, 2, 3 | Relay | User | 6 |
ADC1 | DB15 | 15 | Analog input | User | 11 |
ADC2 | DB15 | 13 | Analog input | User | 12 |
VExt | DB15 | 10 | Output voltage | 4V | — |
GND | DB15 | 14 | Ground | Ground | — |
- The column “GPIO” indicates the virtual GPIO corresponding to the GSM module inside the modem
- The column “Location” specifies in which modem connector said I/O is
- The column “PIN Number” specifies in which connector’s pin that I/O is
- The column “I/O” specifies the I/O type
- The column “Function” tells us if the GPIO has special features in MTX-Tunnel. If it doesn’t use “SMS alarm” or “Wake up” you can use GPIO1 and GPIO2 as user digital inputs.If it uses them, digital inputs are used by the MTX-Tunnel
- The parameters OUTPUT_xxx1 refer to PIN 5 of the DB15 connector
- The parameters OUTPUT_xxx2 refer to PIN 12 of the DB15 connector
- The parameters OUTPUT_xxx3 refer to the relay of the terminal block
- GPIO1 and GPIO2 are optoisolated inputs that can be activated via GND (PIN 14 of the DB15 connector). GPIO3 is a CMOS digital input, activated via VOUT (PIN 10) of the DB15 connector
Jumpers configuration
The modem has serveral switches that allow several configurations:
- [SW5 off] + [SW2 off] + [SW1 off]: RS232 DB9 on, RS232 DB15 on
- [SW7 off]: voltage analog input 1 (0-50V)
- [SW7 on]: current analog input 1 (0-20mA)
- [SW8 off]: voltage analog input 2 (0-50V)
- [SW8 on]: current analog input 2 (0-20mA)
PIN | SIGNAL | DIRECTION | LIMITS | DESCRIPTION |
1 | Normally open | Relay no | ||
2 | Common | Relay common | ||
3 | Normally closed | Relay NC | ||
4 | VIN | Input | 6.5-40VDC | Positive power input |
5 | GND | Input | Negative power (ground) |