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DLP NIR串口通讯

参考DLP User Guide,串口通讯部分。

硬件连接:

J3 Pin3-RX Pin4-TX

波特率:115200

数据位:8

校验位:None

停止位:1

想要实现的功能:Read Device Status

根据命令格式进行编码:

41 42 43 44 C9 00 00 00 C0 00 02 00 03 04 44 43 42 41

但是返回也是:41 42 43 44 C9 00 00 00 C0 00 02 00 03 04 44 43 42 41

即发送个返回一样,硬件上,TX 和 RX没有短路。

请问是怎么回事?

我发送怎样的命令才能获取到正确的返回值呢?