> -----Original Message-----
> From: Brian Guralnick [mailto:[EMAIL PROTECTED] 
> Sent: Friday, July 11, 2003 7:49 PM
> To: Protel EDA Forum
> Subject: [PEDA] OT: DB9 RS-232 serial port on peripherals.
> 
> Hi,
> 
>     I was wondering what the pinouts of a peripheral's female 
> RS-232 DB9 connection.  Basically, a device to be controlled 
> by a standard PC.  I'm having a bit of a conflict concerning 
> the crossing of the RX & TX lines.

Brian

Depends if you want to use a cross wired cable or not.

2 footprints I have used on some IC eval board designs, as control
source & target peripheral, for use with a straight wired cable from PC
to the target board, I have uploaded to
http://www.proteluser.com/download for you, file name DB9 lib.rar

You can see the different pinouts even if you cannot use them.

My basic understanding is that for serial connection between male -
female the cable should be straight wired, the connector
pinout/footprint is different between connectors.

For male-male the cable should be crossed and the connector
pinout/footprint is the same on each device.

I am sure if I got it wrong someone else will correct me :-)

Hope you do not mind the direct email as well, I have been having
trouble posting to this list.

Best Regards

John A. Ross

RSD Communications Ltd
8 BorrowMeadow Road
Springkerse Industrial Estate
Stirling, Scotland FK7 7UW

Tel     +44 [0]1786 450572 Ext 225 (Office)
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