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'[EE:] RS232 RJ12 pinout'
2004\04\20@145156 by Colin Constant

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When you bring an RS232 port out to a RJ12 plug or jack, is there any
standard pinout?  The DB9 to RJ12 adapters seem all to be configurable, so I
guess you could do what you want with the jack on the target, but I was just
wondering if there's any "normal" way to do it.

Thanks,
Colin

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2004\04\20@152458 by William Chops Westfield

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On Tuesday, Apr 20, 2004, at 11:50 US/Pacific, Colin Constant wrote:

> When you bring an RS232 port out to a RJ12 plug or jack, is there any
> standard pinout?

no.  :-(

Actually, there are/were SEVERAL standards, all different, which is
almost worse...

BillW

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2004\04\20@152844 by Doug Hewett

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May I suggest 2 and 3 for Tx and Rx, respectively, relative to a DTE?
(No suggestion for common.)

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Subject: Re: [EE:] RS232 RJ12 pinout

On Tuesday, Apr 20, 2004, at 11:50 US/Pacific, Colin Constant wrote:

> When you bring an RS232 port out to a RJ12 plug or jack, is there any
> standard pinout?

no.  :-(

Actually, there are/were SEVERAL standards, all different, which is
almost worse...

BillW

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2004\04\20@154915 by David VanHorn

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At 12:29 PM 4/20/2004 -0700, Doug Hewett wrote:

>May I suggest 2 and 3 for Tx and Rx, respectively, relative to a DTE?
>(No suggestion for common.)

Center two ground, TX and RX on the sides, and HS out and HS in outermost, so that both transmitters are on one side, and both receivers are on the other!

I've used this plan many times, I call it the highway model.

Crossover cables work, and a single line phone cable plugged into it is busied out, but does no harm to anything..

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2004\04\20@181000 by Bruce Partridge

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> > When you bring an RS232 port out to a RJ12 plug or jack, is there any
> > standard pinout?
>
> no.  :-(
>
> Actually, there are/were SEVERAL standards, all different, which is
> almost worse...
>
> BillW
>

Thats the great thing about standards.  They are so popular that there are
lots of them :-)
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2004\04\20@182435 by redtock8

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part 2 22780 bytes content-type:image/gif; (decode)

2004\04\21@012222 by William Chops Westfield

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On Tuesday, Apr 20, 2004, at 12:49 US/Pacific, David VanHorn wrote:

Well, cisco use the following on their terminal servers and console
ports and other things with rs232 on rj45...

CTS
DSR
RD
Rd GND (on some platforms Rx is differential receiver.  Otherwise gnd)
GND
TD
DTR
RTS

Which end is which depends :-)

The theory goes as follows:

1) In theory, you can plug in a 4 wire rj11 and get your basic three
   wire connection.  With 6 wires in the middle, you get that plus modem
   control.  Add the two output pins for HW flow control as well.  When
   we first put this together, HW flow control was somewhat less common
   that the need for modem control.  (Hmm.  That was the cisco-500,
   circa 1991.  Just about the time v.32 modems were showing up.)

2) Reverse DTE/DCE-ness by using a "flipped" cable (unfortunately common
   in the telco world.)  The symmetry makes it easier to remember, too.

3) IIRC, the center 6 pins are compatible with an old DEC standard.

4) All the inputs on one side, all the outputs on the other.  Goes with
   the 'easier to remember' part.

On the minus side, I'm told that if you plug these into standard
building wiring, inappropriate signals end up in the same twisted pairs.

There's a good resource at http://www.conserver.com/consoles/

BillW

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2004\04\21@013711 by David VanHorn

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At 10:23 PM 4/20/2004 -0700, William Chops Westfield wrote:

>On Tuesday, Apr 20, 2004, at 12:49 US/Pacific, David VanHorn wrote:
>
>Well, cisco use the following on their terminal servers and console
>ports and other things with rs232 on rj45...
>
>CTS
>DSR
>RD
>Rd GND (on some platforms Rx is differential receiver.  Otherwise gnd)
>GND
>TD
>DTR
>RTS


That's the idea!

All M-M cables are then crossovers (assuming F on the equipment)
All extension cables are M-F

Everything works, if it fits.
:)

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2004\04\21@015202 by William Chops Westfield

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Hmm.  This is pretty good too.

http://yost.com/Computers/RJ45-serial/

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2004\04\21@020238 by William Chops Westfield

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On Tuesday, Apr 20, 2004, at 22:37 US/Pacific, David VanHorn wrote:

>> Well, cisco use the following on their terminal servers and console
>> ports and other things with rs232 on rj45...
>

> That's the idea!
>
> All M-M cables are then crossovers (assuming F on the equipment)
> All extension cables are M-F
> Everything works, if it fits.
>
Yep.  You got it.  Oh, I left out the advantage that this means to
connect from one device to another you just use a "standard" crossover
cable and, as you say, everything works.

It was later that we discovered that not all of the rj45 cables that we
had (and sold) were crossover cables :-(  And the rj45/db25 adaptors
with ambiguous naming, resulting in the products that shipped with
non-crossover 'console cables' and the 'wrong' adaptors (combined, they
worked just fine.  Till you started mixing with the other products.)
And then there was the DCE incident, but fortunately that didn't make
it out the door...

USB is SOOO nice.  I wish it was easier to use.

BillW

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2004\04\21@041009 by Alan B. Pearce

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BillW wrote about Cisco routers

>3) IIRC, the center 6 pins are compatible with an old DEC standard.

IIRC Wyse also used this arrangement, again for a similar reason. I think it
was the WY60 and similar terminals had these connectors.

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2004\04\30@213558 by Colin Constant

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Thanks guys.
Colin


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