Group,
Does anyone remember the correct pin-out of a db-25 adapter attached to a
dumb terminal connected to a Digiboard port through a null (straight
through) patch cable? I think pins 2, 3, 7 and (perhaps) 20 should be
connected but I don't remember which color goes with what pin.
Rob

I believe this is the correct pin out, but would not bet my life on it:

RJ45 to DB25 adaptor
2 - green
3 - red
7 - black

Give that a try.

"Robert S. Lobel" <RobertLobel (AT) COX (DOT) net> wrote

color doesnt matter as long as you are consistent

db25 to db25

you may need to cross 2 & 3 depending on the digi

I alway used

2 to 2

3 to 3

4 & 5 jumpered, dont need to wire to digi end


8 to pin 8

6,8,20 jumpered together on crt end and maybe digi

pin 7 to 7

works on about 98% of configurations I ran across way back when

Rich

Robert S. Lobel wrote:

I hate to disagree Richard since I am a 'get along' kind of guy, but color
does matter. These RJ45 to DB25 adaptors are color coated by pin. According
to this chart I just pulled from a very old reference folder:

10 pin RJ45 (Digi)
1 - RI
2 - DSR
3 - RTS
4 - ground
5 - transmit
6 - receive
7 - signal ground
8 - CTS
9 - DTR
10 - DCD

So to a standard DB25 device using xon-xoff handshaking, the pin outs would
be 5-3, 6-2, and 7-7. I believe 5 is green, 6 is red, and 7 is black. I
could have red and green reversed.


"Richard Wilson" <rwilson (AT) lakeside-systems (DOT) com> wrote

Hi
Reliance on colour is very dangerous as no two builders used the same
method. The only safe way is to grab the trusty multi-meter and check pin
to pin in a moulded cable. Otherwise just take the cover off and look - one
benefit - arguably the only benefit - of shortsightedness is that I can just
take off my glasses and read the numbers on a DB25 as clear as a bell.
Careful, TX/RX is different on a DB9 to DB25 on standard RS232 and Apple of
course never had any standards at all.
The answer from Rich is fine for DB25 to DB25
Digis had several different setups which exact one are you using?
Peter McMurray
"Jeffrey Kaufman" <jkaufman (AT) keydata (DOT) us> wrote

Thanks for your input. The Digi I am working with has a modular RJ45
interface. Therefore we have a DB25 (terminal) to RJ45 (Digi) connection.
Any ideas?
Rob
"Jeffrey Kaufman" <jkaufman (AT) keydata (DOT) us> wrote

On May 1, 1:00 am, "Robert S. Lobel" <RobertLo... (AT) COX (DOT) net> wrote:
Scroll down to the bottom of this page. It should help.

TinyURL
http://tinyurl.com/2bgcnc

Original URL
http://www.technick.net/public/code/...inconser_rs232

--
Kevin Powick

That table is perfect. I was wrong about the ground. It should be 4-7.

RJ45 - DB25
5 - 3
6 - 2
4 - 7


"Kevin Powick" <kevin (AT) powick (DOT) ca> wrote

On May 1, 9:13 am, "Jeffrey Kaufman" <jkauf... (AT) keydata (DOT) us> wrote:
Also, since you're likely to be using CAT-5 (twisted pair) cables to
make your serial connection, it can help if you run transmit & receive
(2 & 3 on the DB25 side) on separate pairs on the cable. Jeff's
diagram should keep you out of trouble if you follow it since RJ45
pins 5 & 6 (white/blue & green) are not paired. But if you get
creative with your cabling, don't run white/orange & orange (for
example) to pins 2 and 3 on the DB25 side.

Luke Bucklin

On Apr 30, 10:00 pm, "Robert S. Lobel" <RobertLo... (AT) COX (DOT) net> wrote:
Rob,

I always used to "roll my own" but now I just buy the RJ45-DB25 (or
DB9) adapters from digi. They are reasonably priced, basically
guaranteed to work, and available for terminals, modems, and printers.
Call Digi tech support, tell then exactly what Digi product/version
you have (the RJ pin-outs vary amongst Digi products) and what you you
need to connect to, and they can sell you the exact adapter you need.

/Scott Ballinger
Pareto Corporation
Edmonds WA USA
206 713 6006