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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) or 1x RS485 (configurable with switches)
- Wavecard 868MHz: internal radio card, connected to secondary port
- 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 |
| 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” informs us which modem connector is located the I/O
- The column “Pin number” tells us the I/O terminal block or connector pin number
- The column “I/O” tells us if the GPIO is an input (digital or analog) or a digital output
- 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
- 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 on] + [SW1 on]: RS232 DB9 on, RS232 DB15 off, RS485 off
- [SW5 on] + [SW2 off] + [SW1 off]: RS232 DB9 off, RS232 DB15 off, RS485 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 | -RxB | I/O | RS485 B signal | |
| 2 | +RxA | I/O | RS485 A signal | |
| 3 | ||||
| 4 | VIN | Input | 6.5-40VDC | Positive power input |
| 5 | GND | Input | Negative power (ground) |

Enter the “ethernet” or “modem” connection type:
For an ethernet configuration, make sure the IP parameters are compatible with server access according to the concentrator local network configuration. For an ethernet connection, the configuration must be compatible with the concentrator’s local network topology so that it can access the servers. This configuration is done from the “Networks” configuration page (see section 3.2.2.3: “Networks”).
For a modem connection, the modem configuration must be correct before a connection can be set up. This configuration is done from the “Modem” configuration page (see section 3.2.2.4: “Modem”).
The parameters for the servers to be configured are at least the following:
Therefore the following fields need to be configured: “Interface”, “Type”, “Server type”, “Address”, “Port”, “Login” and “Password”.
The other fields can be left at the default values subject to the directories having been properly created beforehand. See section 3.1.2: “Configuration files” for more details.

Wait. The concentrator will reboot using its factory configuration.







