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usb to serial converter problem

Discussion in 'Hardware' started by jmgv26, Nov 4, 2007.

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  1. jmgv26

    jmgv26 Thread Starter

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    I used a usb to serial port converter in my Toshiba Satellite laptop (don´t have a serial port), Windows Vista recognize it as a device and ready to use it. WHen I connceted a device with a null modem serial cable, it doesn´t work.

    What will be the problem and its solution if any?

    Thanks:confused:
     
  2. Alex Ethridge

    Alex Ethridge

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    I've found these USB to RS232 converter devices just don't work some of the times with certain devices connected and I haven't found a solution yet.

    I hope you have better luck than I have.
     
  3. Frank4d

    Frank4d Retired Trusted Advisor

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    Try using just three wires (TXD, RXD, and Ground) if the device at the end of the cable will work without the handshaking signals.
     
  4. jmgv26

    jmgv26 Thread Starter

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    Thanks Alex, I'll hope so.

    Frank could you be more especific on how to do your suggestion.

    Regards to both of you. :D
     
  5. Frank4d

    Frank4d Retired Trusted Advisor

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    An RS-232 nine pin connector has these signals:
    pin 1 - data carrier detect (DCD)
    pin 2 - receive data (RXD)
    pin 3 - transmit data (TXD)
    pin 4 - data terminal ready (DTR)
    pin 5 - ground
    pin 6 - data set ready (DSR)
    pin 7 - request to send (RTS)
    pin 8 - clear to send (CTS)
    pin 9 - ring indicator (not generally used)

    Many serial devices will work with only three pins (2,3, and 5) wired, so you just need an adapter that has three wires. In a null modem cable, pins 2 and 3 are crossed. Of course, some devices won't work but many do. What device are you connecting?
     
  6. jmgv26

    jmgv26 Thread Starter

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    Frank:

    I´m trying to connect a captive works satellite receiver using a null modem cable to the usb to serial converter.

    W Vista recognize the converter but the receiver connection doesn´t work.

    Thanks again for your help.:(
     
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