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So the PC acts as the Modbus Master and the RevPi Connect acts as the Modbus Slave.

You need the following

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• An USB-RS485 Converter

• The software qModMaster

Preparation

• Have a look at the tutorial “How to Connect Serial Devices”

  • Connect the RS485+ signal line

  • Connect the RS485- signal line

• Make the PiCtory configuration

  • Configure the RevPi Connect and the ModbusRTU Slave

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4. Read it out on the RevPi Connect on the terminal

pi@RevPi14607:~ $ piTest -1 -r Input_1
2 Byte-Value of Input_1: 1 dez (=0001 hex)
pi@RevPi14607:~ $ piTest -1 -r Input_2
2 Byte-Value of Input_2: 2 dez (=0002 hex)
pi@RevPi14607:~ $ piTest -1 -r Input_3
2 Byte-Value of Input_3: 3 dez (=0003 hex)

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