How to make a RS232 cable to the length you want
First you need a cable, I advise you to take the cable alarm, the length that I knew to do with this type of cable is a 30m (1181 inches)
Then you will need 2 sheets rs232 more commonly called female db9
When you open the files db9, they present as follows:
Take the right part, or you will have to intervene to weld, this small plate is numbered from 1 to 9, then take 3 wire cable whatever colour because it does not matter and cut other son flush because you will not utility.
Solder the wires 3 following the diagram below according to the numbers.
2 sur 3
3 sur 2
5 sur 5
You will get this:
Why are told that the cable is a crosstab, simply because the number 2 the first plate is welded with the number 3 the second plate and number 3 the first plate is welded with the number
2 the second plate.
Then you need to do that narrowed small box and you are ready to use it
For those who have no RS232 port on their computer:
You will need a USB converter rs232
It comes with a small disc called Driver, once configured on your PC, you can connect the cable manufactured rs232 male on your converter
Ps: Sorry for my english, is not verry good