DS200TCPSG1ARE
DS200TCPSG1ARE
DS200TCPSG1ARE
.1 MODBUS 协议的主从编程方法
触摸屏和DSP 按照MODBUS 协议通信，将触摸屏作为主站，DSP 作为从站，串口连接采用RS485。触摸屏和DSP 的通信是有触摸屏发起的，DSP 采用中断方式响应触摸屏发送来的数据，非通信情况下DSP 可以做其它更多的工作。当触摸屏有数据发送给DSP 时，触发DSP 接收中断，DSP 进入接收中断服务子程序，此时，触摸屏发送给DSP 的是一个完整的数据帧，至少包含8 个字节的数据长度， 在完整读取这组数据后，DSP 对其进行处理。首行从设备站号匹配(本文中DSP 站号设为07)，如果匹配不则DSP 不响应触摸屏的查询，DSP 不回送任何信息;如果匹配则进行CRC 校验，若CRC 校验出错，则查询失败，不返回数据信息;若CRC 校验正确，则进行下一步的命令解析，并返回给触摸屏对应的数据信息。
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