usb to serial converter problem

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jmgv26

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Nov 4, 2007
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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:
 
Joined
Apr 10, 2000
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9,288
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.
 

Frank4d

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Sep 10, 2006
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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.
 

jmgv26

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Nov 4, 2007
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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
 

Frank4d

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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?
 

jmgv26

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Joined
Nov 4, 2007
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3
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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