LSIS G100 - Modbus-RTU Protocol

7.3.2 Modbus-RTU Protocol
7.3.2.1 Function Code and Protocol (Unit: byte)
In the following section, station ID is the value set at CM.01 (Int485 St ID), and
starting address is the communication address. (The starting address size is in bytes).
For more information about communication addresses, refer to 7.4 DriveView9 on
page 226.
Function Code #03: Read Holding Register
Query Field Name
Response Field Name
Station ID
Station ID
Function(0x03)
Function (0x03)
Starting Address Hi
Byte Count
Starting Address Lo
Data Hi
# of Points Hi
Data Lo
# of Points Lo
…
CRC Lo
…
CRC Hi
Data Hi
Data Lo
CRC Lo
CRC Hi
Function Code #04: Read Input Register
Query Field Name
Respo
nse
Field
Name
Response Field Name
Station ID
Station ID
Function(0x04)
Function (0x04)
Starting Address Hi
Byte Count
Starting Address Lo
Data Hi
# of Points Hi
Data Lo
# of Points Lo
…
CRC Lo
…
CRC Hi
Data Hi
Data Lo
CRC Lo
CRC Hi