Description
SUM=CMD+……+ETX；
30h+31h+30h+46h+36h+30h+34h+03h=74h;
累加和超过两位取低两位
命令格式
1、DEVICE READ（读出软设备状态值）
计算机向PLC发送：
始命令首地址位数终和校验
STX CMD GROUP ADDRESS BYTES ETX SUM
例子：从D123开始读取4个字节数据
02h 30h 31h,30h,46h,36h 30h,34h 03h 37h,34h
地址算法:address=address*2+1000h
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