5X00070G04
5X00070G04
5X00070G04
一个完整的命令帧由控制字符STX(02H)、命令码(CMD)、数据段、控制字符ETX(03H)以及和校验码五部分组成。其中,和校验码是从命令码到控制字符ETX的所有字符的ASCII码(十六进制)相加所得结果的低两位数。
①PC机“读”命令帧
“读”命令帧由报文开始标志、命令码、软元件首地址、软元件数据长度(字节数)、报文结束标志以及和校验码组成。
当通信正确时,PLC返回的应答帧由报文开始标志、数据段、报文结束标志以及和校验码组成;通信出错时,PLC应答“NAK”。
②PC机“强制ON”命令帧
PC机“强制ON”命令帧由报文开始标志、命令码(37H)、软元件地址、报文结束标志以及和校验码组成。接收命令正常时,PLC应答“ACK”;接收出错时,PLC应答“NAK”。
& 公司全称 : 厦门泰尼电气有限公司
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