Modbus-RTU-4ch-Relay-12v

[cofhal]

I have been trying to use this program with this card: https://mikroelectron.com/Product/Modbus-RTU-4ch-Relay-12v-RS485-Module-4-Input-Optocoupler-Isolation/ but it does not work. What could I be doing wrong or if it definitely doesn't work for this type of cards.

[sanny32]

Hello @cofhal. For answer to you need more information.

1. Connection scheme and modbus params.
2. Operation system where execute OpenModSim.
3. Serial port log received from any serial port sniffer program.

[talenat-st]

@cofhal you can not use modbus slave simulator for that kind of card.You need modbus master so look at this programm https://github.com/sanny32/OpenModScan