怎样看modbus规约报文.doc

怎样看modbus规约报文01 03 02 BC 00 38 84 44 /召唤YM设备地址 功能码（YM） 协议地址(700) 寄存器数量 CRC校验码注意：一个遥脉占用两个寄存器数量，所以00 38表示28个遥脉01 03 70 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 05 00 00 00 设备地址 功能码（YM） 字节数 数据区00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 49 14 /4个字节表示1个YM 高字节在前 低字节在后 应答YM召唤01 01 00 32 01 12 1C 58 设备地址 功能码（YX） 协议地址 YX数量 CRC校验码01 01 23 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 设备地址 功能码（YX） 字节数 数据区00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F9 CB /1个字节表示8个YX 应答yc召唤01 03 02 58 00 2C C4 7C /召唤YC设备地址 功能码（YC） 协议地址(600) YC数量 CRC校验码01 03 58 0D CB 0D C6 00 00 00 00 00 00 00 00 00 00 00 设备地址 功能码（YC） 字节数 数据区00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 6D /2个字节表示1YC 高字节在前低字节在后 应答yc召唤01 0f 01 90 00 0a 02 00 01 cd 01 /遥控令设备地址 功能码 协议地址 控制数量 字节数 数据区 CRC校验码01 0f 01 90 00 0a ce 02 /遥控令应答01 0f 01 90 00 0a 02 00 00 cd 01 /遥控复归令设备地址 功能码 协议地址 控制数量 字节数 数据区 CRC校验码01 0f 01 90 00 0a ce 02 /遥控令应答成功发完遥控令后，必须发遥控复归令清零。否则，这一遥控点下次不允许遥控。注意：遥控令与遥控复归令的区别在于：遥控令的数据区不为0，遥控复归令的数据区为0。判断遥控不能成功的原因，就可以看遥控令的报文是否发到ecs方的中央控制单元