【物联网设备端开发】Arduino IDE的ModbusRTU, ModbusTCP库

帐篷Li-物联网布道师

发布于 2024-03-20 08:32:57

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文章被收录于专栏：开源物联网平台开发开源物联网平台开发

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一、ModbusRTU, ModbusTCP and ModbusTCP Security

有关图书馆的使用详情，请查阅相关文档部分。

二、功能

支持所有Arduino平台
在多个实例的任意组合中运行
- Modbus RTU 主站
- Modbus RTU 从站
- Modbus TCP 主站支持 ESP8266/ESP32 和 Ethernet library
- Modbus TCP 从站支持 ESP8266/ESP32 和 Ethernet library
- MODBUS/TCP Security 主站 (ESP8266)
- MODBUS/TCP Security 从站 (ESP8266/ESP32)
支持的Modbus功能码:
- 0x01 - Read Coils
- 0x02 - Read Input Status (Read Discrete Inputs)
- 0x03 - Read Holding Registers
- 0x04 - Read Input Registers
- 0x05 - Write Single Coil
- 0x06 - Write Single Register
- 0x0F - Write Multiple Coils
- 0x10 - Write Multiple Registers
- 0x14 - Read File Record
- 0x15 - Write File Record
- 0x16 - Mask Write Register
- 0x17 - Read/Write multiple registers
支持的Modbus功能
现实生活复杂例子
- ESP8266/ESP32 通过 Modbus 更新固件
- ModbusRTU to ModbusTCP bridge

三、注意

寄存器的偏移量是基于0的。所以在设置您的监督系统或测试软件时要小心。例如，在ScadaBR中，偏移量是基于0的，那么在库中配置为100的寄存器在ScadaBR中将被设置为100。另一方面，在CAS Modbus Scanner中，偏移量是基于1的，所以库中配置为100的寄存器在这个软件中应该是101。
基于MAX-485的RS-485收发器工作在至少115200的速率上，而XY-017/XY-485由于某种原因只工作在9600的速率上。

四、最近更新：

// 4.1.1
+ Protocol: Fix wrong error code responce on non-existent register
+ ModbusTCP: Fix potential memory leak
+ API: cbEnable/cbDisable functionality extended
+ ESP-IDF: CMakeList.txt added
+ Examples: TCP-to-RTU fixed

// 4.1.0
+ API: Raw Modbus frame processing functionality
+ ModbusRTU: Precise inter-frame interval control
+ Examples: True ModbusRTU to ModbusTCP Server bridge
+ Examples: ModbusRTU respond to multiple ID from single device
+ ModbusRTU: Add direction control pin for Stream
+ STL: Add Reg count limitation to vector limit of 4000 (for ESP8266 and ESP32)+ Settings: Added MODBUSIP_CONNECTION_TIMEOUT (ESP32 only)
+ Settings: Set MODBUSIP_MAX_CLIENTS = 8 for ESP32
+ ModbusTCP: Make using DNS names optional feature
+ ModbusRTU: Add separate RE/DE pins control optional feature
+ API: Drop support of Ethernet library v1
+ Examples: Teknic ClearCore ArduinoWrapper examples added
+ Examples: ModbusTCP to ModbusRTU example added
+ ModbusRTU: Flush extra delay optional feature

// 4.0.0
+ Support of all Arduino boards
+ ModbusTLS: ESP8266 Client/Server and ESP32 Client
+ ModbusTCP: ModbusEthernet - WizNet W5x00, ENC28J60 Ethernet library support
+ 0x14 - Read File Records function+ 0x15 - Write File Records function
+ Examples: FW update over Modbus fullfunctional example
+ 0x16 - Write Mask Register function+ Test: 0x16
+ 0x17 - Read/Write Registers function
+ ModbusRTU: ESP32 SoftwareSerial support+ Build with no STL dependency (switchable)
+ API: ModbusIP => ModbusTCP
+ API: Access control callback for individual Modbus function
+ API: Master/Slave => Client/Server according to [PRESS RELEASE](https://modbus.org/docs/Client-ServerPR-07-2020-final.docx.pdf)
+ Lot of code refacting and small fixes

五、路线图

// 4.2.0
- API: Alternative CRC calulation (reduced memory footprint)
- ModbusRTU: Static buffer allocation- Test: Frame accuracy to specefication
- Buffer/packet size limitation support
- Slave/Server: slavePDU use early exit by return where possible
- Master/Client: Check frame size against header data where possible
- Master/Client: Additional responce data validation
- Free global registers and callbacks on remove last Modbus instance
- Test: push/pull functions
- ModbusTCP: Refactor connect by dns name (using native implementation for ESP32 etc)

// 4.3.0
- ModbusTLS: ESP32 Server
- Test: TLS ESP32 Server
- Test: TLS ESP32 Client
- Examples: TLS Certificate test Role extension and Alt-Name
- Examples: TLS Add example explanation
- ModbusTCP: ModbusAsyncTCP
- API: Extend API to allow custom Modbus commands
- Examples: Basic file operations
- Examples: Revising