21 def PDU_encode(func, regi, num=1, data=None): 22 funcList = {'r': b'\x03', 23 'w': b'\x06'} 24 funcCode = funcList[func] 25 registerStart = struct.pack('!H', regi) 26 registerNum = struct.pack('!H', num) 27 if data and func == 'w': 28 dataCode = struct....
Response PDU: Function Code 1 byte 0x2B MEI Type 1 byte 0x0E ReadDevID Code 1 byte 0x01/0x02/0x03/0x04 Consistency Level 1 byte N/A More 1 byte 0x00/0xFF Next Object ID 1 byte Object ID number Object Number 1 byte N/A Object ID List 1 byte N/A ...
Application Layer 5.1 Function Code List Table 5-1 Function code list Function Code Meaning Remarks 0x03 Reading Supports continuous reading of single or multiple registers. 0x06 Writing into a Supports writing into a single register. single register ...
4 Modbus 功能码/ Modbus Function Code 在Modbus功能码中,1-65位为公共功能码,定义了一些通用的功能 5 Modbus TCP/RTU对比 / Modbus TCP/RTU Comparison 5.1 Modbus RTU与Modbus TCP读指令对比 MBAP报文头 地址码 功能码 寄存器地址 寄存器数量 CRC校验 Modbus RTU 无 01 03 01 8E 00 04...
It works like function 16, but allows writing bits selectively scattered within the registers. *** So in summary, if *I* were to do a product, this is my list: - Bare Min: 3,6,8(echo only),16 (limited 1-bit support!) - Preferred: 1,3,5,6,8(echo only),15,16 - Best: ...
1/*定义用于传递要访问从站(服务器)的信息*/2typedefstruct{3uint8_t unitID;4FunctionCode functionCode;5uint16_t startingAddress;6uint16_t quantity;7}ObjAccessInfo; 2.2、怎么解析数据响应 对于数据响应,我们同样不需要考虑全部的操作码,我们一般需要考虑读请求的响应,因为他们的数据需要解析。而对于写请求...
4 FunctionCode functionCode; 5 uint16_t startingAddress; 6 uint16_t quantity; 7 }ObjAccessInfo; 1. 2. 3. 4. 5. 6. 7. 2.2、怎么解析数据响应 对于数据响应,我们同样不需要考虑全部的操作码,我们一般需要考虑读请求的响应,因为他们的数据需要解析。而对于写请求返回数响应只是告诉主站成功或者不成功...
OHG 1-3 Modbus Manual X-STREAM XE HASXEE-IM-MB 5/2017 1.3 Modbus - Supported Functions 1.3 Supported Functions Function Code Modbus Function Note 1) decimal (hex) ReadCoils 01 (0x01) for registers of 2000 ReadDiscreteInputs 02 (0x02) for registers of 1000 ReadHoldingRegisters 03 (0x03...
Modbus Function Code Job 1 Default = 0 0 = Job is disabled 1 = FC01 2 = FC02 3 = FC03 4 = FC04 5 = FC15 6 = FC16 int x x 6 0 6 x x Startadr_J1 Start address in Modbus system for job on related Modbus master int x x 65535 0 0 x x Length_J1 Number/length of dat...
西门子PLC多个站点MODBUS轮询通讯 CP341 Modbus RTU多站点轮询CP341 Modbus RTU Polling Multi-Slaves