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'[EE]: RS-232 connections'
2001\11\20@115645 by Bob Barr

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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

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2001\11\20@123315 by Martin Peach

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Not totally certain but I think DTR to DSR, DCD is not used.
In Windows you can use either CTS/RTS or DTR/DSR for hardware handshaking.
Often the PC's CTS is connected to its own RTS at the remote end of the
cable (to verify that a cable is plugged in) and DTR/DSR are usd to gate the
data flow.
/\/\/\/*=Martin

{Original Message removed}

2001\11\20@164319 by David Huisman

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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 removed}

2001\11\20@172937 by Bob Barr

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On Wed, 21 Nov 2001 08:38:36 +1100, you wrote:

>Bob,
>
>Try http://www.beyondlogic.org/serial/serial.htm
>
>It is very informative interface related site for Serial, Parallel,
>Keyboards etc etc
>

Thanks, this looks like an excellent link. Very complete and
straightforward,

Regards, Bob

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



'[PICLIST] RS-232 connections'
2002\01\04@114827 by Larry Williams
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use ground, txdata, rxdata only. on connector, tie rts,cts together.
dsr, dtr, and carrier detect together. on db25, thats 4 - 5, 6 -8- 20,
ground 7, tx 2, rx 3. pc sends on 2, receives on 3. I usually connect 1
and 7 both for ground(common)

Martin Peach wrote:
>
> Not totally certain but I think DTR to DSR, DCD is not used.
> In Windows you can use either CTS/RTS or DTR/DSR for hardware handshaking.
> Often the PC's CTS is connected to its own RTS at the remote end of the
> cable (to verify that a cable is plugged in) and DTR/DSR are usd to gate the
> data flow.
> /\/\/\/*=Martin
>
> {Original Message removed}

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