test master

Example Projects > 0122 UniPi 1.1 > 0122-25 Modbus TCP Slave > test master

Modbus master for testing UniPi as Modbus TCP slave

This folder contains the source files for the demonstration project on using REXYGEN on the Raspberry Pi minicomputer with the UniPi extension board.

This example is a Modbus TCP master for testing the UniPi as Modbus slave. The Modbus TCP slave device (UniPi) is supposed to have the IP address

Modbus registers

UniPi input signals

Register No. Meaning Data range
0 Digital inputs (LSB=I01) 0..4095
1 Analog input 1 (0..10V, 16-bit) 0..65535
2 Analog input 2 (0..10V, 16-bit) 0..65535

UniPi output signals

Register No. Meaning Data range
2048 UniPi relays (LSB=relay 1) 0..255
2049 Analog output (PWM on pin 18) 0..1023

Adding signals, changing Modbus register mapping, changing IP address of the slave device

Go to Modbus TCP Master driver (MTM block) configuration and press "Configure" for Modbus configuration. Make sure to read the Modbus driver documentation (see below).


Additional information

  • More info about the UniPi board can be found at unipi.technology.
  • Raspberry Pi is a trademark of the Raspberry Pi Foundation.
  • Visit the REXYGEN webpage for more information about the example projects and developing advanced automation and control solutions using REXYGEN.