Modbus Slave Acknowledge Response format


Thread Starter

Andrew Mackie


really new to modbus protocol, I understand the formatting on how a master sends commands to the slave device but want to know what the slaves response is supposed to be (if any) and how is it formatted (I am using RTU).

I have a custom embedded device using a microchip PIC microcontroller and I want to be able to use it as a slave and have a PLC send it commands. I have been using AScii but now that I am studying MODbus it seems it may be the way to go.

thanks for any help. cheers