MAX488 can point to multipoint communication, why can I do a bit of two communication, but at 3 o 'clock, there is no any return data, a great god answers,
Circuit diagram

CodePudding user response:

First rule out the hardware problem;
Hardware connection without problems, host sends a broadcast information or point-to-point alone send messages, broadcast information all from the machine can be received, from point to point that is not do after receive the information feedback, from machine program has a problem;
From each machine should be assigned an identification number, when the host sends a message to, from comparing identification number, to know is in call themselves, and then to respond,