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Split from Send data via modbus rtu rs485.

Hello Gopiram

should the ET200 act as Modbus RTU Master or Slave??

Bye Murof

ET200 act as a Master .Want to connect 10 slaves ie LED Display

Hello,

pls check this example (link): Modbus RTU S7-300 vs ET200S Example

Hello,

ok, so if you mean that in example is only receive, same system can be made with send. That example can be good start what you need set on CM cfg properties, communication settings. If RECV instruction is in example (check name of instruction), other but SEND block can be used. Insert that block in your code, click on it and type F1 for help. In other case TIA system manual can be also used with right SEND instruction name. What other help do you need?

Hello,

pls think that exact example what you're looking for doesn't probably exists, therefore I recommend examples where is generally descibed communication configuration and instruction family. In other case system manual of your used CPU with TIA version system manual can be used. You need check also manual of that LED display, you need to know what registers can be reached and what data type registers use. Without this you can't be lucky.