Modbus PDU data byte


Thread Starter

Aman Deep

We are facing some problems to control a Toshiba HVAC device:

1. Is it possible to control Operating modes in single coil write? (single coil is bit-addresable)

2. In multiple coil write, the data frame is given below as per mentioned in Modbus protocol Specification:
Slave Address | Function | Address | Quantity | Data | CRC

How to write the values in data, to control any mode / setting?