Cannot write to serial port

Joined: Mar 13, Messages: Likes Received: TimV , then how can I add it manually? If not, check your cabling, Usb from the front ports! The blue cable! Ah, I see.. Let me check it tomorrow since the printer is in the office. TimV , thank you for the help. I am not an expert in unix. I can ensure you, it works out of the box, immediately with Rumba and ramps1.

Alex Moderator. Joined: Sep 4, Messages: 2, Likes Received: If there are no other ports list in the drop down then "AUTO" won't work either You should at least first read all the data and then write.

As I said that I am very new, and I know, I have terrible mistakes. Could you give me some example about write and read data to understand? What is the reason of this? JonB number of written bytes. So what is your "proof" that they are not? I don't know about serial ports, but in general this is not right in Qt, the data sent back may arrive a while later. You are supposed to use readyRead signal for asynchronous operation.

Your protocol first waits for bytes to arrive initially, then writes something back; is your device then supposed to send something back to you? If so, it will then ping-pong endlessly? Is there a tool you can use to verify whether your bytes are being sent to the Linux serial device? Because, I dont know how to learn number of written bytes.

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Call us! Incorrect Communication Parameters The most common cause of serial port communication problems is incorrect communication parameter settings. Serial Port Problems. Posted in Serial Port.