A strange problems, is a master DSP and six from point to point to more two-way communication, DSP from not to communicate between DSP control, network mode using RS422, now there is a problem, if only one power from the DSP control, then the master DSP and this one from point DSP can normal communication, but six from DSP control after power on, each from DSP control can normally receive master data from the DSP, but general control DSP can't receive any data from DSP control, communication chip USES MAX488, the problem is that from the DSP control MAX488 send pins have normal signal, master DSP MAX488 receive pin no signal is, please ask someone encountered this problem ~

CodePudding user response:

I met the same situation, I use MAX490CSA SOP8, feel the problem is that the IO control can not make; Should be choose the wrong type chip