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how to make a null-modem-cabel

Null Cable Modem 
The cable null-modem you servants in order to load and to unload the software al/dal decoder (programming) and to make other things, type to see the dump of boot of the DB entering in telnet... the etc etc The cable null modem is finished from two connectors female 9 or 25 poles DB-9; this cable is called also Lap-Link, in used how much for the transfer given from PC PC with the famous software. Not used other cables, or cables that you are not sure are effectively wire to you correctly, in how much you could damage decoder and seriale of the PC.

This is the piedinatura for the version 9 pin - 9 pin:
1+6 < - - - > 4 
2 < - - - > 3 
3 < - - - > 2 
4 < - - - > 1+6 
5 < - - - > 5
 7 < - - - > 8 
8 < - - - > 7 

This is the piedinatura for the version 9 pin - 25 pin
(for old the PC with seriale to 25 pin)
1+6 < - - - > 20
 2 < - - - > 2 
 3 < - - - > 3 
 4 < - - - > 6+8 
 5 < - - - > 7 
 7 < - - - > 5 
 8 < - - - > 4 

Not used converters, reducers or others marchingegni that not null-modems to the seriali of the PC and the decoder... to times adapt your cable, in order not to spend 10 euro, is only risked to make damages.