Modbus RTU - X20CS1020 - Sample

[marek.svozil]

Hello,
A short and simple example of how to communicate one variable via Modbus RTU.

1. To project Add Library Sample : LibDRVmbus1_ST

2. Change Sample :

3. According to the documentation, add the variable which I want to read:

4. X20CS1020 Configuration
   Set Cyclic Stream mode :

4. Reading :
   RTCSecondE = Event
   RTCSecondM = Mapping/Data
   So I set RTCSecondE to TRUE. At that moment, the data is filled into RTCSecondM, and at the same time it resets itself RTCSecondE back to FALSE (Reset to FALSE is also a verification for me that the reading is done)
   So if I wanted to read cyclically in each cycle, then in each cycle I will call: RTCSecondE := TRUE;

[kovarj (Jaroslav Kovar)]

Thanks for sharing