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help to setup a modbus Geobrick


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Hello, I need help to setup a modbus Geobrick.

The Geobrick (master) communicates with a safety PLC (slave)


The Modbus protocol says to communicate, you must configure (on the master ) the IP address, the slave number and the register number + function code (3 for Read Holding Registers or 16 for Write Multiple Registers)


At PEWIN32, I do not see how to configure the slave number and register number. Can someone explain me?

I see, you need to configure the "Modbus reference #", but what data should I put (N° slave + starting adresss?? Unit identifier ?)?



When I use a program like "Modbus Doctor", I can read the desired value (see screenshot below).




thank you in advance for your help

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