[lug] PC to PC serial cable?

[George Sexton]

The one I use is

1 (CD) -> (6 & 4 DSR & DTR)
2 (RD) -> 3 TD
3 (TD) -> 2 RD
(4 & 6 DTR & DSR) -> 1
5 (SG) -> 5 SG
7 (RTS) -> 8 CTS
8 (CTS) -> 7 RTS
9 (not connected)



-----Original Message-----
From: lug-admin at lug.boulder.co.us [mailto:lug-admin at lug.boulder.co.us]On
Behalf Of Scott A. Herod
Sent: 22 February, 2001 4:32 PM
To: lug at lug.boulder.co.us
Subject: Re: [lug] PC to PC serial cable?


Well, my cable didn't show anything, so I went by Radio Shack as someone
suggested.  If you're interested, here's the pinout their null-modem
cable uses:

1 - 4
2 - 3
3 - 2
4 - ( 6 and 1 )
5 - 5
6 - 4
7 - 8
8 - 7
9 - not connected

( Of course using the radio shack cable sees nothing either unless I
plug it into two linux boxes.  The Windows to Linux connection gives
nothing, and I know my code is reading data.  Why am I not surprised? )

Scott

"Scott A. Herod" wrote:
> 
> Hi,
> 
>   I'm trying to create a PC to PC serial cable ( 9 pin )and I've found
> discussions in a couple of HOW-TOs
> 
> http://www.redhat.com/mirrors/LDP/HOWTO/Text-Terminal-HOWTO.html
> 
> and
> 
> http://www.redhat.com/mirrors/LDP/HOWTO/Serial-HOWTO.html
> 
> Most of the stuff there is completely Greek to me, plus the connectors
> I currently have access to don't quite match those described.
> 
> I've got two connectors which accept Cat5 cable in one end and
> are DB9 on the other end.  Can someone explain how the pin connection
> should go?  I've only got 8 wires of course.  Is the pin-out:
> 
>    2  <--  3   Transmit
>    3  -->  2   Receive
>    5  <->  5   Ground
>    8  <--  7  Req. to Send
>    7  -->  8  Clr. to Send
> 
> Are the others left unconnected?  Should I snip them or is it safe to
> have
> them pass through?  If the latter, which pin should I leave off?
> 
> Thanks,
> 
> Scott
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