PM
-
3133i User
’s Manual v1.02
Last Revised: Apr. 2023 Page: 35
Copyright © ICP DAS Co., Ltd. All Rights Reserved.
E-mail: [email protected]
7.2 Specifications
Modbus-TCP structure
Byte 00~05
Byte 06~11
6-byte header
RTU Data
Modbus-TCP( Byte 00~05)
Byte 00
Byte 01
Byte 02
Byte 03
Byte 04
Byte 05
Transaction identifier
Protocol identifier
Data length
upper byte
Data length
lower byte
Transaction identifier = Assign by Modbus/TCP Master (Client)
Protocol identifier = 0
Data length (upper byte) = 0
Data length (lower byte) = Depend on the number of the RTU Data bytes
RTU Data structure
Byte 06
Byte 07
Byte 08-09
Byte 10-11
Net ID
(Station number)
Function Code
Data as needed
Address Mapping
data
Net ID (Station number)
：
Assign the device (Modbus/TCP slave)
。
7.2.1 Modbus Register
Please refer the 6.2.2 Modbus Register
。
