Chapter 6 Serial Communication
6.1 MODBUS Communication
This controller supports the read/write function of
register in the standard MODBUS-RTU network
communication protocol in the master-slave form (supports
function codes 03H, 10H). It is usually suitable for data
exchange between a slave and a host in a bus network.
If the address that is sent to the slave does not match or
the CRC check error occurs, the slave will not respond.
6.1.1 Explanation of Function Code and Data Frame
Read Command 03H Send Format
High
segmen
t of
starting
address
Low
segmen
t of
starting
address
High
segmen
t of the
number
of