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moDBus Coils

ModBus常用功能码 (功能码为10进制) 01 READ COIL STATUS 读线圈寄存器 02 READ INPUT STATUS 读状态寄存器 03 READ HOLDING REGISTER 读保持寄存器 04 READ INPUT REGISTER 读输入寄存器 05 WRITE SINGLE COIL 写单线圈寄存器 06 WRITE SINGLE ...

modbus线圈储存值和输入状态值都是奇数位数值.串行卡处理数值类型和数据映射. modbus指的是MODICON公司为该公司生产的PLC设计的一种通信协议,从其功能上看,可以认为是一种现场总线。 coil是线圈的意思。

看到了吧,前面就是笔数,就是读取第几笔数据。

Read coils (FC 1) Request Byte 0: FC = 01 Byte 1-2: Reference number Byte 3-4: Bit count (1-2000) Response Byte 0: FC = 01 Byte 1: Byte count of response (B=(bitcount+7)/8) Byte 2-(B+1): Bit values (least significantbit is fir...

import modbus_tkimport modbus_tk.modbus_tcp as modbus_tcpimport threadingimport modbus_tk.defines as mdeflogger = modbus_tk.utils.create_logger(name="console", record_format="%(message)s")server = modbus_tcp.TcpServer()#creates...

See the following, hope to help. // 档名: RS232_x.C-- // 缘由:为了VIGOR PLC modbus与PC图控软体的RS232连线 // 使用说明: // /* 01: Read coil status 02: Read input status 03: Read holding register 04: Read input registers 05: For...

Modbus协议建立了主设备查询的格式:设备(或广播)地址、功能代码、所有要发送的...Read Coil StatusRead Input StatusRead Holding Registers(读保持寄存器)Read ...

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