Bob,

Try http://www.beyondlogic.org/serial/serial.htm

It is very informative interface related site for Serial, Parallel,
Keyboards etc etc

Regards

David Huisman

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Bob Barr
Sent: Wednesday, 21 November 2001 3:51
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: RS-232 connections


I'm interfacing a device to the RS-232 port on a PC and would
appreciate suggestions regarding the required connections.

I've got a 9-pin female connector on the device and I'm using a
straight-through female-to-male cable from the PC to the device.

So far, I have ground, device Txd and device Rxd on pins 5, 2, and 3
respectively. I can communicate to and from the device with ProComm.
So much for the easy part. :=)

My real issue is looping back the handshake lines to most easily
interface to a PC. I'd like to avoid forcing any changes to the PC's
default handshake settings.  For this application, I don't need any
hardware handshaking so I'm planning to jumper the appropriate pins
together at the device.

I'm fairly certain that RTS and CTS (pins 7 and 8) need to be
connected. Should I also make a connection between DCD, DTR and DSR
(pins 1, 4, and 6)? (DCD to DTR looks most likely but I'm not at all
sure about that.)

Any suggestions?

Thanks, Bob

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.