Triggering/Reading serial Barcode Scanner

    Hello,


    I'm trying to trigger a scanner and read the read data over a serial connection.
    Triggering by a short message and reading the data works fine but is very slow.
    After reading the data, I want to trigger again, but I get no result. I have to wait aprox. 200ms Sleep(200). When I trigger after that time, I get a result. When I don't wait, my scanner delivers no data back.
    What could be the problem?
    I assume maybe the timeouts are the problem? But I set it to:
    COMMTIMEOUTS timeouts;
    timeouts.ReadIntervalTimeout = MAXDWORD; // MAXDWORD
    timeouts.ReadTotalTimeoutMultiplier = 0;
    timeouts.ReadTotalTimeoutConstant = 0;
    timeouts.WriteTotalTimeoutMultiplier = 0;
    timeouts.WriteTotalTimeoutConstant = 0;
    and no success.
    I raised the thread priority from THREAD_PRIORITY_NORMAL up to THREAD_PRIORITY_TIME_CRITICAL but also no success.
    Anyone a Idea? I don't know how to speed up my reading.


    Thanks a lot in advance

    Hello,


    i assume that this is not a problem on the WCE side. What happens when you send the same data via a terminal program?
    Can you measure what happens on the data and control lines?

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Hello,


    yes you were right. It was indeed a problem of a very slow barcode scanner (especially the settings).
    The send/receive methods wasn't the big break.
    So the problem is solved...


    Thanks al lot anyway.