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Modbus-rtu/Document/my_document/Modbus RTU最大长度ADU...

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Originalformat Blame Verlauf

Modbus RTU最大长度ADU测试

串口助手请选择HEX发送。下列报文已经完整展开，可以直接复制。

测试条件：

  • 从站地址为0x01
  • 先执行0x0F写线圈，再执行0x01读线圈
  • 先执行0x10写保持寄存器，再执行0x03读保持寄存器
  • 0x10和0x03使用D6000起始地址，避免覆盖掉电保持区和通信历史区
  • 文档中的全零读取响应以相关线圈和保持寄存器初始值均为0为前提
  • 0x0F一次最多写1968个线圈，不能单次清零全部2000个待读线圈；测试0x01前还应确认线圈1968～1999为0
  • 0x10一次最多写123个寄存器，不能单次清零全部125个待读寄存器；测试0x03前还应确认D6123～D6124为0

0x0F写入1968个线圈

含义：

  • 01：从站地址
  • 0F：写多个线圈功能码
  • 00 00：起始线圈地址0
  • 07 B0：写入数量1968
  • F6：后续线圈数据长度246字节
  • 连续246个00：将线圈0～1967全部写为OFF
  • A6 FE：CRC低字节、CRC高字节
  • 测试目的：用255字节合法请求帧检查DMA接收缓冲区边界和最大线圈写入数量

请求帧长度：255字节

请求帧：

01 0F 00 00 07 B0 F6 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A6 FE

预期响应帧长度：8字节

预期响应帧：

01 0F 00 00 07 B0 56 4F

0x01读取2000个线圈

含义：

  • 01：从站地址
  • 01：读线圈功能码
  • 00 00：起始线圈地址0
  • 07 D0：读取数量2000
  • 3F A6：CRC低字节、CRC高字节
  • 响应中的FA表示后续包含250字节线圈状态，因为2000 ÷ 8 = 250
  • 响应中的250个00表示线圈0～1999全部为OFF
  • F5 AF：全零响应对应的CRC低字节、CRC高字节
  • 测试目的：检查最大线圈读取数量以及255字节响应帧的DMA发送

请求帧长度：8字节

请求帧：

01 01 00 00 07 D0 3F A6

预期响应帧长度：255字节

预期响应帧：

01 01 FA 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F5 AF

0x10写入123个保持寄存器

含义：

  • 01：从站地址
  • 10：写多个保持寄存器功能码
  • 17 70：起始地址6000，即D6000
  • 00 7B：写入数量123
  • F6：后续寄存器数据长度246字节
  • 连续246个00：将D6000～D6122全部写为0
  • 76 06：CRC低字节、CRC高字节
  • 正常响应回显起始地址17 70和写入数量00 7B
  • 测试目的：用255字节合法请求帧检查DMA接收缓冲区边界和最大寄存器写入数量

请求帧长度：255字节

请求帧：

01 10 17 70 00 7B F6 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 76 06

预期响应帧长度：8字节

预期响应帧：

01 10 17 70 00 7B 84 45

0x03读取125个保持寄存器

含义：

  • 01：从站地址
  • 03：读保持寄存器功能码
  • 17 70：起始地址6000，即D6000
  • 00 7D：读取数量125
  • 81 84：CRC低字节、CRC高字节
  • 响应中的FA表示后续包含250字节寄存器数据，因为125 × 2 = 250
  • 响应中的250个00表示D6000～D6124全部为0
  • 08 E8：全零响应对应的CRC低字节、CRC高字节
  • 测试目的：检查最大保持寄存器读取数量以及255字节响应帧的DMA发送

请求帧长度：8字节

请求帧：

01 03 17 70 00 7D 81 84

预期响应帧长度：255字节

预期响应帧：

01 03 FA 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 08 E8

检查项

  • 0x0F和0x10请求的ModbusRxFrameLength应为255
  • 0x01和0x03正常响应的responseLength应为255
  • droppedFrameCount不应增加
  • uartErrorCount不应增加
  • 不应发生HardFault、DMA越界或接收停止
  • 完成255字节帧后，下一帧仍应正常通信