On 2012-08-16 at 12:56 -0400, Lawrence K. Chen, P.Eng. wrote:
> Along these lines....who makes an inexpensive ethernet to serial console
> adapter?
>
> Planning to replace my current servers with a couple of headless/fanless mini
> PCs (one in my network closet and one in my Home Theatre rack). At work we
> use Digi CM's...though their pretty pricey, plus I only need a couple single
> serial port adapters.
You need to be a little more specific: you mean to use cat5 cabling as
the wiring for serial between a DE-9 adaptor and something else, or a
DE-9 on both ends, or something else?
For instance, a monoprice.com USB-serial adaptor is product id 3726,
$5.54 for one, $5.27 each for two to nine. That's USB A Male to "DB9M",
which is labelled "DB9 male connector" (I guess they really mean DE-9).
If you have those, then you can use some RJ-45/DE-9 adaptors yourself,
just buy a bag of adaptors and choose how to wire them. DB9F (pid 1152)
start at $0.61 each and go down from there, same price for DB9M (1151).
I've done this, it works.
So if you buy parts for just one, that's $6.76 plus tax and shipping,
not including the cat5 cabling.
Attached are my notes from when I last made these up, quite a few years
ago. Plain text, will need a monospace font for the diagrams to work
(and it's UTF-8, to capture the drawing characters I used at the time).
As a sysadmin, I've mostly dealt with the software layers, thanks to a
hardware hex, so there are plenty of people on this list who can correct
any misunderstandings and fill in gaps in knowledge about
standardisation in what I wrote. Seriously, if there's any kind of
standard for colour-coding for serial-over-cat5-wiring then use that,
instead of the scheme I derived with logical approximations.
All LOPSA members hereby granted permission to rip the UTF-8 RJ-45 art
out of this document for use elsewhere, without attribution, so that you
can use the only really good part of the doc in something better. :)
Hand-crafted.
-Phil
Serial is RS-232.
DE-9 adaptors; D for D-subminiture (from Cannon), E is the size.
DB-25, DE-9.
RS-232 over DE-9 : EIA/TIA-574
RS-322 over RJ45 : EIA/TIA-561
RJ-45
=====
Looking from front, cable trailing away behind viewable area,
or from top, latch underneath.
8 1 1┌─────────┐8
┌─┬┬┬┬┬┬┬┬┬─┐ ┌┴─────────┴┐
│ │││││││││ │ │ ┌┬┬┬┬┬┬┬┐ │
│ └┴┴┴┴┴┴┴┘ │ │ │││││││││ │
│ Front │ │ └┴┴┴┴┴┴┴┘ │
│ ┌─────┐ │ │ │
└──┤ ├──┘ │ Top │
└─┬─┬─┘ ├───────────┤
└─┘ │ │
latch └───────────┘
cable
Not aware if cat5e pin↔colour combinations are standardised.
1 Orange/White DSR/RI
2 Orange DCD
3 Green/White DTR
4 Blue SGND
5 Blue/White RD
6 Green TD
7 Brown/White CTS
8 Brown RTS
DE-9
====
1 DCD in
2 RD in
3 TD out
4 DTR out
5 SGND -
6 DSR in
7 RTS out
8 CTS in
9 RI in
DE-9 / RJ45 adaptors
====================
As purchased from monoprice.com; not aware of colour standards.
Looking in, 8 on left, 1 on right, blank spot to right of 1.
Left → Right
8 White
7 Brown
6 Yellow
5 Green
4 Red
3 Black
2 Orange
1 Blue
Serial Passthrough
==================
This is the "pdp passthru", as it's my own; there is no standard for serial
passthru, but as long as the same is used at both ends, there's no problem.
I prefer to use null-modem dongles to handle the 146 bridging.
I map the pins between standards to preserve line meanings.
I do not map RI (Ring Indicator).
┏━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━┓
┃ DE-9# ┃ Adaptor ┃ Signal ┃ RJ45 ┃ RJ45 ┃
┃ ┃ Colour ┃ ┃ Pin ┃ Colour ┃
┣━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━┫
┃ 1 │ Orange │ DCD │ 2 │ Orange ┃
┃ 2 │ Green │ RD │ 5 │ Blue/White ┃
┃ 3 │ Yellow │ TD │ 6 │ Green ┃
┃ 4 │ Black │ DTR │ 3 │ Green/White ┃
┃ 5 │ Red │ SGND │ 4 │ Blue ┃
┠───────┼─────────┼────────┼──────┼──────────────┨
┃ 6 │ Blue │ DSR │ 1 │ Orange/White ┃
┃ 7 │ White │ RTS │ 8 │ Brown ┃
┃ 8 │ Brown │ CTS │ 7 │ Brown/White ┃
┗━━━━━━━┷━━━━━━━━━┷━━━━━━━━┷━━━━━━┷━━━━━━━━━━━━━━┛
# vim: set expandtab :
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