Add Modbus function to reset a Power Monitor
dakriege opened this issue · comments
I'm using the library with an Adafruit ESP32-3 and a Modbus Power Monitor.
The Power Monitor has a KWH Totalizer that can be reset using a custom Modbus Command 0x42.
The format of the command is SlaveID + 0x42 + CRC High Byte + CRC Low Byte
The reply length is 0 bytes. -> SlaveID + 0x42 + CRC High Byte + CRC Low Byte
Using a SAND51 processor and the Arduino Modbus library it was pretty easy to add the 0x42 function.
Can you offer any help in adding the 0x42 command or a means to send raw data to create a custom message.
This issue was resolved using the Raw Request function. I added a 0x42 function code in the modbus.h file so that it could be used in the MasterPDU switch statement that tests the reply function code returned in the slave response.