请教,如何知道一台未知触摸屏的站号?能采用广播协议询问触摸屏的站号吗,谢谢!
通过RS232,MODBUS RTU协议的广播报能行吗?谢谢指点! Toke Ring mode for Rs232,Rs485 for multidrop mode. I am gonna communicate an AVR with an address-unknown touch screen,in one master & one client architecture.
Thank Billleu for replying, however I haven't an idea about what you meant. Maybe it is too,too much for me.
Would you kindly drop more lines in details? It'll be highly appreciated! MODBUS协议中广播是从站不回应的,所以不可能知道未知的站号。
PPI协议中有DC DC协议,可以监听到网络上所有通讯的站号信息。 我想到一个笨方法,主机把全部地址码轮询一遍,收到应答就知道了吧 谢谢3楼朋友。你回复的关于modbus的帖子我早已收藏。
我用的不是西门子的PLC,是一个Autoface的触摸屏,只下载了说明书,啥也没有,不知道怎么访问。
谢谢指点!
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