Communication with PLC SIEMENS S7-200 over MODBUS

[tlambin]

Hi, I want my Domoticz raspberry pi to work as a MODBUS MASTER.

This way I can send/receive commands to my PLC which works as a MODBUS SLAVE. The plc does not have any network cards, but the CPU 224 has a com0 port.

How should I connect the cable to my raspberry-pi?

Do I need additional hardware?

Which settings do I need to make in domiticz?

Have you got other tips/tricks?

Please advice

[salvacalatayud]

+1