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USB to Serial RS-232 cable help

  • 22-02-2011 9:48pm
    #1
    rustybays
    Closed Accounts Posts: 1 ✭


    Hi all
    im trying to programme variable speed drives with laptop software through a USB to RS232 serial converter . i loaded the cable software and the laptop reconises it when connected but when i connect to the unit im tring to programme the software tells me that the cable is damaged etc . i bought another cable to see if it worked but had same results . i have checked the comm number matched the stop bit parity etc . Does any one have any ideas i would much appreciate the help
    Tagged:


Comments

  • #2
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 92,625 Mod ✭✭✭✭Capt'n Midnight


    which OS ?

    which usb chipset ? lusb will list it in linux, with windows you have to go into properties in device manager and look at the ID's - probably a prolific like this 067b:2303 Prolific Technology, Inc.. PL2303 Serial Port
    http://www.dealextreme.com/p/usb-to-rs232-serial-port-adapter-transparent-green-24512
    (you can pay many, many times this for ones with the same chipset :( )


    which pins do you need ? many are just 2,3 and 5 so won't do hardware handshaking, just xon-xoff at best , what settings does the equipment have ?

    FIFO buffers can be a problem

    also old dos/windows 9x programs that expect to see a serial port at a fixed address usually fail to recognise USB ports

    voltages can be a problem what was serial 3-15V depending on who you believe, 5V from usb just may not be enough , I had a serial mouse that would work on a desktop but on a laptop I had to wire up a 9v battery to it


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