GB/T 19582.1-2008: Modbus industrial automation network specification -- Part 1: Modbus application protocol

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Scope

Modbus is an application layer message transmission protocol at Layer 7 of the OSI
model. It provides client/server communication between devices connected to different
types of buses or networks, as shown in Figure 1.
Since 1979, Modbus has been the de facto standard for industrial serial links, enabling
communication between thousands of automated devices. Currently, support for the
simple and sophisticated Modbus architecture continues to grow. Internet users can
access Modbus using reserved system port 502 on the TCP/IP stack.
Modbus is a request/response protocol, that provides services defined by function codes.
Modbus function codes are elements of a Modbus request/response PDU. This Part
describes the function codes used within the Modbus transaction processing framework.
The Modbus application layer message transport protocol is used for client/server
communication between devices connected via different types of buses or networks.
Currently, Modbus communication is implemented in the following ways.
- TCP/IP over Ethernet, see GB/T 19582.3.
- Asynchronous serial transmission over various media (wired. EIA/TIA-232-E,
EIA-422, EIA/TIA-485-A; fiber optic, wireless, etc.).
- Modbus+, a high-speed token passing network.
Figure 1 -- Modbus communication stack

Basic Data

Standard ID	GB/T 19582.1-2008 (GB/T19582.1-2008)
Description (Translated English)	Modbus industrial automation network specification -- Part 1: Modbus application protocol
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	N10
Classification of International Standard	25.040
Word Count Estimation	54,533
Date of Issue	2008-02-27
Date of Implementation	2008-09-01
Older Standard (superseded by this standard)	GB/Z 19582.1-2004
Quoted Standard	GB/T 15969; RFC 791
Regulation (derived from)	Announcement of Newly Approved National Standards No. 3 of 2008 (No. 116 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the Modbus transaction processing function code used within the framework. Modbus application layer packet transmission protocol used by different types of buses or networks between devices connected client/server communication. Currently, the following ways to achieve Modbus communication: Ethernet TCP/IP, see GB/T 19582. 3. Various media (wired: EIA/TIA-232-E, EIA-422, EIA/TIA-485-A, optical, wireless, etc.) on the asynchronous serial transmission. Modbus +, a high-speed token-passing networks.