Building a HP ProCurve DB9 Serial port adapter

For use with a standard Cisco Console Cable.

Grab a regular Cisco DB9 to RJ45 console cable and any DB9 to RJ45 modular adapter.

Close-ups of the cable pinouts – pictures were taken off a camera phone.

Modular Adapter Cable to Pin chart:

RJ45 Female (Cable Color) DB9 Serial Female1 – White 82 - Brown 63 – Yellow 24 - Green Unused – Clip or push aside5 - Red 56 - Black 37 - Orange 48 - Blue 7

Also, a handy bit on information for if you ever find yourself in the position of having access to one of the DB9-RJ45 adapters shown above but no rollover cable.

The cable layout of a Cisco DB9 to RJ45 console cable is as follows:

Pin 1 — Blue wire

Pin 2 — Orange wire

Pin 3 — Black wire

Pin 4 — Red wire

Pin 5 — Green wire

Pin 6 — Yellow wire

Pin 7 — Brown wire

Pin 8 — Grey/White wire

Using a cat5e cable with a modified female modular adapter. Wire the modular adapter as follows:

Blue cable to position 8

Orange cable to position 6

Black cable to position 2

Yellow cable to position 3

Brown cable to position 4

Grey/white cable to position 7

Red and green cables spliced together to position 5

Join the bare wires from each cable together and secure with insulation tape.

Other Serial Info:

Null Modem Pinout (http://www.lammertbies.nl/comm/info)

Connector 1 Connector 2 Function

2 3 Rx Tax

3 2 Tx Rx

4 6 DTR DSR

5 5 Signal ground

6 4 DSR DTR

7 8 RTS CTS

8 7 CTS RTS