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problem in USB to serial converter with isolation

Discussion in 'General Electronics Discussion' started by PRIYADHARSHINI, Jul 23, 2014.

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    Feb 6, 2014
    i m using usb to RS-232/485 to acquiring the Data..when i connect the converter to the PC
    it indicate the port number in Device manager.but when i am trying to connect it through moDbus poll it inDicates that "port not available".what is the reason for this issue?
  2. Ehsan


    Jun 12, 2014
    Check the COMx port number in the device manager, It's not always COM1. Sometimes it is COM4 or other numbers. Download a program like 'putty' ( ) and try to connect to the converter through a Serial Session. Press keyboard keys to see if the converter LEDS blink or not.

    If it does not show any activity it might be a wrong driver for the converter, change the driver then. Change your OS ( if it is Win7 then use Win XP or even Linux), and your PC if possible.
  3. Gryd3


    Jun 25, 2014
    If you don't want to spend a lot of time with an OS installation, grab a linux distribution and make a 'Live CD' or USB device with it... It's as easy as downloading the ISO and burning to disk. This will allow you to reset your computer with the CD/DVD in the drive to boot from to try linux. If you dont like it shutdown the computer and take the disk out and your back to your original system.
    Windows can be finicky sometime with certain drivers like this. MAC and Linux can shine a little brighter here.
    Ehsan likes this.
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