GB/T 26882.4-2024 in English
VALIDGrain and oil storage—Monitoring and control system of stored-grain condition—Part 4∶Information exchange interface protocol
- Issued on:2024-11-28
- Implemented on:2025-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 26882.4-2024粮油储藏 粮情测控系统 第4部分：信息交换接口协议》由TC270（全国粮油标准化技术委员会）归口，TC270SC3（全国粮油标准化技术委员会粮食储藏及流通分会）执行，主管部门为国家粮食和储备局。
Introduction
Background of Standard Revision and Technological Evolution
This revision is based on the experience accumulated from the implementation of the 2011 version of the standard for more than ten years, and focuses on responding to the following technical development needs:
| Evolution Dimensions | 2011 Version | 2024 Version |
|---|---|---|
| Monitoring Indicators | Mainly Temperature and Humidity | Add Multiple Indicators such as Moisture/Gas/Pests |
| Network Architecture | Local Networking | Full Reservoir Area Coverage |
| Control Function | Basic Control | Ventilation/Air Conditioning/Circulation Linkage |
Core Communication Protocol Analysis
4.1 Communication between Host and Extension Machines
Adopting Master-Slave Architecture, key parameter definition:
- Serial port configuration: 1-8-N-1 mode, baud rate supports 1200-9600bps
- Ethernet configuration: TCP port 1238, UDP broadcast port 5000
- Response time ≤200ms
5.1.1 Data Frame Structure
| Field | Length | Sample Value | Function Description |
|---|---|---|---|
| Start Character | 4Byte | 55H AAH 55H AAH | Frame start identifier |
| Extension address | 1Byte | 01H | Device addressing |
| Control character | 1Byte | A2H | Instruction type |
Typical application scenario
Grain temperature monitoring process
- The host computer sends instructions in the format of Table 8
- The extension returns data in the format of Table 9/10
- Convert according to formula 5.1.2.7:
T=(Tnh×256+Tnl)/10
Special value processing:
Open circuit = 7777H, short circuit = 8888H, blank point = 9999H
System connection implementation suggestions
5.2 Information exchange interface
Two types of core interface specifications:
| Interface type | Caller | Typical method | Data format |
|---|---|---|---|
| Warehouse management → Measurement and control system | WMS | Get_GrainTestingData | Table 37 structure |
| Measurement and control system → WMS | Measurement and control system | Get_BarnBaseInfoData | Table 21 structure |
Implementation Notes
- Ethernet communication needs to be configured with IP in the same network segment
- Data verification uses CRC-16 algorithm
- Timestamp format is unified as YYYYMMDDHHMMSS
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