通信装置的软件描述
2.1 FX2系列PLC与计算机之间通信协议
FX2系列PLC与计算机之间的通信采用RS-232标准，其传输速率固定为9600bps，奇偶校验位采用偶校验。数据格式如图2所示。数据以帧为单位发送和接收。一个多字符帧由力所示的五部分组成，其中和校验值是将命令码ETX之间的的呢字符的ASCII码（十六进制数）相加，取得所得和的低二位数。STX和ETX分别表示该字符帧的起始标起和结束标志。
FX2系列与计算机之间的通信是以主机发出的初始命令，PLC对其作出响应的方式进行通信的。共有0、1、7、8四种命令，上位机实现对PLC的读写和强行置位。通过ENQ、ACK和NAK，上位机协调与PLC的通信应答。
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GUTOR 640-4049A Rev 2 Controller Board 0P0360 NEW
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