Qt Serial Port Communication Examples
Said in: in my code and enter the command at lineEdit, but device can't conduct command. Well, I can't guess what error codes are you getting, right? I don't even know if you connected to the device correctly. Did it get the command? Did it reply with anything? Have you connected the readyRead to some slot, or used waitForReadyRead to wait for the reply?
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I don't give you whole solution for your problem, I'm not here to write the code for you. I'm happy to help you overcome problems and learn. Said in: i have question, how to check connected device with qt?
Only i enter the command and device conduct command? First step is to check if port-open returned true. When calling port-write you can check if the amount of bytes written is the same you sent. If not, something went wrong.
Serial Port Communication Program
C++ Serial Port Communication
Then you can check and see what was the problem. Another clue might be whether readyRead is emitted in response to your command. If there is no reply, then again - something might be wrong (or not - that depends on what the command is and which device you connect to).