From a host to take a. two machine,
A power supply from the power supply of machine failure disappears,
Host and B from machine communications also appear problem,
The host can receive b's reply, but you can't receive the data returned b, this phenomenon should be how to understand?

CodePudding user response:

Should the data line has been down.
Oscilloscope for measure the signal to compare the normal power supply and fault waveform