AnsweredAssumed Answered

Use Com port to control relay card

Question asked by douba on May 15, 2019
Latest reply on May 21, 2019 by douba



Here I want to control a relay board with COM port(RS 232), its switch on command is "01 05 00 00 FF 00 8C 3A",

At the beginning, I use a COM debug application(XCOM V2.0) to try the connection, and it is working properly.

see below picture,

Then I try to use the "Direct I/O" to control the relay board, the problem is no response!

please see below picture, and I double checked the serial port setting, it is correct.

how should I do next step? thanks a lot!

BTW, both "EOL OFF" and "EOL ON" were tried, but didn't work.