wiring cat5e rj45 vto rs232 (25 pin)

You mean RS-232, not rj232.  The one to choose depends on the cables to the printer - is it a 25-pin or 9-pin serial cable?  The difference between the straight and the null versions is the null version is a null modem cable with the transmit and receive pins reversed on the other connector, to allow you to connect two PCs together.  The straight version is what you use to connect a PC directly to a printer.  Cisco rollover cable refers to the cat5 cable and is like a null modem cable for cat5, used to connect PCs to router console ports.  It has the ends reversed: http://pinouts.ru/NetworkCables/rj45_rollover_pinout.shtml

If everything is using straight cables, choose the DB-25 straight or DB-9 straight, depending on the connector of the serial cable.

sorry i should have included more details.

both are 25pin rs232 (sorry for the typo!)

so i plan on plugging on into the pc 25 pin printer port, cat5e to the printer and convert back to 25pin rs232 again into the printer.

so just to check it will be the straight version i take it then?

many thanks for your quick replies, too.

Matt.

Selvol

ok thanks for that. do you know of a colour coding diagram too so i know which wires are which.

sorry for the hassle.

many thanks,

matt.

Hold on a sec!  Did you say you are plugging the computer end into the 25 pin PRINTER port?  That port is not a serial port - its a parallel port.  You will need to install a 25 pin serial card into the computer if you wish to use the printer's serial port (or do you already have one installed?).  

ok sorry thanks for that yes i was going about it completely wrong.

ok we have 9 pin serial on the machine and i have bought a convertor for the pc connection as an interim solution (i have ordered 2x rj45 to rs232 9pin).

so as i have 2x rj45 to 25pin rs232, i will attach the convertor and connect to the 9pin serial on the pc. I will then cat5e to the printer where i will convert back to 25 pin rs232 using the second convertor.

many thanks for all your help!.

matt

You should confirm whether the printer has a serial or parallel port.  You should also use a straight converter if you have a serial port, not the crossover model selvol posted - crossover cables are for connecting PCs to other PCs, not PCs to printers.

ok thank you.

i have tested the printer on the serial port with no problems using a short 25 pin rs232 (printer side) to 9 pin (computer side).

ok so regards this for converting to cat5e etc. if the printer is operating rs 232 serial and running through to 9 pin on the serial.

will it just be the  DB9 Straight and DB 25 straight using the link i posted?

Yes, you'll need a DB9 Straight for the PC to connect to the cat5e cable, then a DB25 straight from the cat5e to the printer.

Hi i connected as mentioned above and the printer is now not available. It works when i use a standard cable but not the cat5e.

i followed the db straight for both the 25 pin and 9 pin colour from the link i was given.

i there something wrong with this?

just to add to what i said before.

if i look at the pins available on the working serial lead pin 5 isnt in use. does this help?

Try it with a cat5e patch cable, just to be sure the wire in the wall isn't doing something.

Which connector doesn't have pin 5 in use?
http://pinouts.ru/SerialPorts/Serial9_pinout.shtml

or

http://pinouts.ru/SerialPorts/RS232_pinout.shtml

sorry for the delay.

at the moment i'm trying the connection with a short existing (and working) cat5e cable to ensure that there is nothing wrong with this. I do have a length of cat5e cable ready for when we wire it through the wall.

on the cable that came with the printer the 25pin rsr232 end doesnt have anything on pin 5, if this helps.

also thanks for the links callandor. however i dont know which colour code refers to which wire (i.e. which colour wire is RTS, etc) . do you know of a link which gives this info?

hi sorry for the multiple comments, i've just checked the wiring of the cable ive been testing (its an out of the box one i had lying around) and it follows the cat5e patch i.e.

http://www.lanshack.com/make-cat5E.aspx

i.e. 568-b (sorry)

The DB-25 Straight connector on http://vegan.net/tony/serialp3.php shows pin 5 is connected - are you saying the cable for the printer doesn't have it connected?  If the same cable works on a direct connection, then it's not needed.

Hi thanks for the comment again.

yes the (HP) serial cable that came (and works with the printer) doesnt have a pin coming out of pin five, it does have pins for 1-4 7, 8 + 20.

I think I see the problem - these extenders need the same adapters on each end of the cat5e, or the pins won't match up.  I foolishly assumed they used the same pins whether you were using a DB9 or DB25 - my fault.  You need two DB9/cat5e adapters, then a DB9/DB25 converter (or two DB25/cat5e adapters and a DB9/DB25 converter).  Sorry I didn't see that earlier.

thank you for that.

ok so just to check  they would be the db9 straight?

finally. i cut into the mould on the 25pin side of the working cable to see the colour code. these were;

1 - black
2 - brown
3 - red
4 - black (also??)

7 - orange
8 - green
20 - yellow

does this help?

many thanks

Matt.

ok (thank you so much for this help youve been a life saver!!), so in theory, as long as the colour codes match up the other side it should work? (i take it the wires are all the same)

so for example if  were to wire the red cable on the 9pin side into point 1 (i.e. ground) then on the 25 pin side the red cable should be pin 5?

again many thanks for youre help.

Matt.

hi also to add i have tried using two 9 pin female serial to rj45 with a 25 pin male to 9 pin male convertor, again this hasnt worked?

i tried this with two seperate cat5e cables (all pre bought and used) and all patch-b is there anything else i can try?

could the printer be interfacing in a different way i.e. db9 null? or is this not possible?

many thanks for all your help.

matt

http://www.tek-tips.com/viewthread.cfm?qid=776332&page=58

is the solution here worth a try? or will my 220D be different?

>so for example if  were to wire the red cable on the 9pin side into point 1 (i.e. ground) then on the 25 pin side the red cable should be pin 5?

Yes, but stay with the DB-9 Straight layout, where pin 1 id CD, not ground.   Pin 5 is ground, which should be connected to green, and on the other end green should be connected to pin 7 of the 25-pin connector.

>hi also to add i have tried using two 9 pin female serial to rj45 with a 25 pin male to 9 pin male convertor, again this hasnt worked?

This should have worked - the null cables are for connecting PC to PC, not PC to printer.  You may need to check what each pin is connected to in the 25 pin male to 9 pin male convertor - see my post http:#a25072524, which lists which signals are on which pins.

just to confirm using the combination from the link above sorted the problem! and it works!. thank you very much for all you're help! it was invaluable.