cat 5 to serial wiring

inode

hi,

i wondering does anyone known the exact wiring for a cat 5 to a serial connection. like were each colour goes etc. i have a souldering iron and souldering wire.

cheers

JohnnieM

inode wrote:

hi,

i wondering does anyone known the exact wiring for a cat 5 to a serial connection. like were each colour goes etc. i have a souldering iron and souldering wire.

cheers

You can get modular rj45 connectors .use a patch cable plus two connectors....pretty handy..
or i just googled this
http://www.jneuhaus.com/serial/index.html

niallb

Hold on a sec.
There's no such thing as a standard RJ45 to serial cable.
There are a couple of almost standards.
Cisco's one is popular.

What pieces of equipment are you trying to connect?
I presume one end is a PC/terminal or a modem?

The nice thing about the connectors JohnnieM linked to
is that you get to plug them in whatever way you need them.
The links on that page should get you fixed up, but ideally
find the manuals for the equipment you need to connect.

If you name the equipment, I'll do my best to come up
with the full pinout for you.
Best of luck,
NiallB

inode

hey,

its for a clocking in system called timeclox. it is hard wired on the clocking in system and is being wired up to the office to go into the computer through a serial connection. the guy who installed it left a serial connection for us to connect. i might just ring the company tomorrow to get all the info.

thanks all

niallb

So does that mean you have a 9 pin serial port looking at you from the clock?
If so it gets easy, because that at least has been standard for years.
I'm not sure where the cat5 comes in.
How far is it from the clock to the PC?
Does the PC have a serial port?

Sorry for all the questions,
but they come before answers :-)

NiallB

inode

at the clock end it is hardwired. the cat5 then goes up to the office (about 6 metres). the pc has a serial port.

niallb

Thanks.
If it's hardwired in, you'll need the clock manual to know what pin is which,
and need to find out from whoever installed it what colours they used.

Ring the company. They'll sort you out faster than anyone else can.
They're the only ones with the info you need!
They really shouldn't have left it like that in the first place
unless there was a problem getting into the room with the PC.

You shouldn't really need a soldering iron.
A crimp onto the end of the cat5, and an adapter
like those described above would be better.

If you're handy with a soldering iron, fire ahead,
but keep the temperature down and tin well.
It's not hard to melt up a serial plug if you're not
used to working with them.

Get the plug gripped horizontally, and tin all the terminals.
Just touch the tip of the iron to the end of the concave piece
on the back of the pin, and let the solder flow down and completely fill the hollow.
Repeat for each pin, and turn over for the other side.

Trim off the ends of the cat5 and spread out the colours you want
so that they match up with the pins you need to connect to.
Strip about 3mm and tin lightly with solder until gleaming.
You may find it easier to strip a longer piece and tin more,
but trim back with a snips afterwards to about 3mm.
Double check your colours match your pins, and again
do one side at a time. Start with pins 1-5 (they're marked in tiny writing).
Place the wire on the solder in the pin and touch briefly with the iron.
Remove the iron when the wire sinks into the solder. Let it solidify
before doing the others. When they're done, move to the other side.
You may only need to do 3 or 4 pins.

Keeping the serial connector tightly mounted is the most important thing
while doing this. A vice is ideal, but in a pinch, plugging it onto the
end of a cable and jamming that in a drawer has been known to work well :-)

Make sure to attach any cable tension pieces that came with the plug.
You don't want anything pulling directly on your soldering.

Good luck,
NiallB

inode

thanks NiallB. will be up there friday afternoon and will ring company. will post up the outcome

WizZard

Do ring them. The guys there will sort you out in a few minutes.

inode

got it all sorted. all that hate to be wired was 5 3 and 2. the colours were brown orange and brown white.

Capt'n Midnight

inode wrote:

got it all sorted. all that hate to be wired was 5 3 and 2. the colours were brown orange and brown white.

where did the third wire (ground) go ??

re brown: before gigabit/PoE brown would have been the less used pair.
10/100 uses green/orange
2 wire phone usually uses blue