我用S7-200 CPU224XP端口1做modbus主站,与底下一块自行开发的温度板(从站)通讯,参数均都设好了,可是与温度板一直无法通上.温度板是RS485(2)接口,比特率,站号,位数,校验位,从站响应时间都和主站相同.
请问温度板的从站协议里还需加入什么才能和S7-200通上.比如功能码之类的参数...请高手指点迷津.
问题补充：
这里感谢轻轻飞的回答,不过我的温度板MODBUS从站协议已按照规定接口,比特率,站号,位数,校验位,从站响应时间设置好了,保持寄存器地址使用40001.
请问我的从站协议程序里还少了什么参数设置?
最佳答案
主要检查你的温控板关于modbus协议的接受和发送数据帧,先检查能否正确收到和解析S7-200用modbus协议发过来的数据侦,这恐怕要用仿真器连单片机监视,才行.
如果以上不行,你的先检查电缆通,然后你的单片机程序.
S7-200modbus协议使用可以去看网上的相关资料
提问者对于答案的评价：
的确问题出在我的温控板程序上,感谢大家的回复.
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