CODEWITHSUNDEEP
javavirtual-serial-port
josepmra
josepmra

Reputation: 627

Error Win XP setting serial port state

I have the following code fragment to show a HELLO WORLD by a USB Device (Display Posiflex PD-2800 for POS).

I use the GiovynetDrive library to manage a virtual COM port.

The code runs perfectly (assuming the COM3 is available).

    SerialPort = new SerialPort();
    Parameters settings = new Parameters(); 
    settings.setPort("COM3");
    settings.setBaudRate(Baud._19200);
    Port = new Com(settings);   //<<--Seting crash when restart
    Port.sendString("HELLO WORLD");
    Port.close();

My problem is that when I turn off the computer, it doesn't turn off the device (USB power). This cause that the next startup, the code throws the Exception: 

    java.lang.Exception: Error setting serial port COM3 state.
    at giovynet.nativelink.SerialPort.openPortC(Native Method)
    at giovynet.serial.Com.<init>(Com.java:48)
    .........

This forces me to unplug and plug the USB device and then it works well again.

I think this behavior of the S.O. is configurable, but I don't know as.

UPDATE:

When the USB device is in the restart pending state, I can make a print test without problems using a text only printer (generic driver of the S.O.). Then I can see the print test by my viewer but from my java code still not working until I unplug it.

The S.O. is Windows XP and the USB root HUB (of the device management) have unabled the option "Allow the computer turn off the device to save energy".

Upvotes: 0

Views: 315

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