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Electronics => Electronics => Topic started by: karmax on October 14, 2008, 03:27:18 AM

Title: rs 232 cable
Post by: karmax on October 14, 2008, 03:27:18 AM

hi guys... i want to connect rx and tx pin of my rf module withmy rs232 wire but its pack it has 9 wire.
red
grey
black
yellow
orange
blue
green
violet
light pink

i want to know which is transmission and which is receving wire.. please reply

Title: Re: rs 232 cable
Post by: izua on October 14, 2008, 03:55:58 AM

rs wires coloring varies widely.
tx pin is 2, rx pin is 3, gnd is 5. put a ohmeter on your wire and at the other end.

Title: Re: rs 232 cable
Post by: BuddingContraptionist on October 14, 2008, 07:07:27 AM

true rs232 has only tx, rx, and ground when you don't do any flow control.  if you turn on flow control it uses the other wires as a handshaking mechanism, check this out:

http://www.internet-remotecontrol.net/pccompci/rs232-cable-technology.html (http://www.internet-remotecontrol.net/pccompci/rs232-cable-technology.html)

Title: Re: rs 232 cable
Post by: Admin on October 15, 2008, 09:46:11 PM

Trace the wires to the connector:

(http://www.arduino.cc/playground/uploads/Learning/rs232_pinout.gif)