LB233变送器RS485通信协议简易版中文)

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1、LB-233质量流量计变送器MODBUS协议用户手册简易版Ver:A2012-02-10目录1.MODBUS连接.............................................................................................................................22.数据格式......................................................................

2、..................................................................23.MODBUS故障信息.....................................................................................................................34.MODBUS功能代码.................................................

3、....................................................................35.响应时间........................................................................................................................................46.电缆线规格.......................................

4、.............................................................................................47.数据帧格式定义............................................................................................................................57.1功能代码：0X03(读1个或多个寄存器).......

5、.......................................................................57.2功能代码：0X06(写单个寄存器).........................................................................................67.3功能代码：0X10(写多个寄存器)........................................................

6、.................................68.寄存器说明....................................................................................................................................711.Modbus连接本变送器Modbus为RS-485MODBUS采用RTU方式进行数据传输。本变送器为RTU模式，采用8bit二进制字符，RTU传输模式的数据帧采用

7、CRC校验下表为传输模式：传输模式RTU(8bit)编码格式8bit二进制(0x00–0xff)起始位1数据位8校验位无、奇、偶停止位1、2帧校验CRC162.数据格式Int数据长度2bytes(一个寄存器)RegisterNByte1Byte0Mostsignificantbyte(MSB)Leastsignificantbyte(LSB)Float使用2个寄存器存储单精度IEEE754格式的浮点数。数据长度4bytes(2个寄存器)RegisterN+1RegisterNByte3Byte2Byte

8、1Byte0SEEEEEEEEMMMMMMMMMMMMMMMMMMMMMMM注：M—尾数,E—指数,S—符号位：0：正1：负数据一帧的字节顺序：对于Int参数：FirstbyteSecondbyteRegisterNByte1Byte0Mostsignificantbyte(MSB)Leastsignificantbyte(LSB)2对于Float参数：FirstbyteSecondb