你没有协议文本么？推测校验是异或校验，从字符S开始
变量的类型定义里，长度为5
1 Write Character 04
2 Write Character 30
3 Write Character 31
4 Write Character 02
5 Write Character 53
6 Write Character 31
7 Write Data ASCII Real
8 Write Character 03
9 Write Check Sum XOR(8-bit) Start 4 End 0
10 Transmit N/A