Printer Cable FREE cabling and networking Helpdesk
 Question by Ron posted 13 Feb 2001
 Printer Cable
I Want To Extend My Printer Cable!
I Going To Use Two RJ45 To DB25 Adapters ( Male & Female) & A RJ45 To RJ45 Patch Cord.
How Many Pins Do I Need & What Pin # Do I Use (Colors Of Wires)
 Answer by Dmitri Abaimov posted 14 Feb 2001
Dear Ron,

Please make sure you're extending Serial printer connection since for the parallel cable there are just not enough conductors in four-pair cable.

If you're extending a serial cable, the confusing thing is that there is no standard pin layout at RJ45 end. In fact, whatever colors you'll use, you'll be right as far as both ends are done with the same colors. Note: if that's not a null-modem cable

As a reference, you can take a pin layout of Avaya 355-type adapter which is successfully used for maybe 20 years by now:


1 RI 22
2 DCD 8
2 DSTR 6
3 DTR 20
4 GRD 7
5 RD 3
6 TD 2
7 CTS 5
8 RS 4

Dmitri Abaimov, RCDD

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