I/O Description: MTX-IOT [4-S-P-N]

/in /by
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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)