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geekhack Community => Keyboards => Topic started by: Infinite north on Fri, 23 July 2010, 21:13:32

Title: RJ45 to ps/2
Post by: Infinite north on Fri, 23 July 2010, 21:13:32

Does anyone know the wire layout for RJ45 to ps/2? I am using an old ps/2 cord and the wiring on that end is easy enough but I am not sure where to put what for the RJ45 end.

Title: RJ45 to ps/2
Post by: Superfluous Parentheses on Fri, 23 July 2010, 21:40:53

Quote from: Infinite north;205834

Does anyone know the wire layout for RJ45 to ps/2? I am using an old ps/2 cord and the wiring on that end is easy enough but I am not sure where to put what for the RJ45 end.

Are you talking about an IBM Model M (SDL) connector (which AFAIK are NOT RJ45 but look similar) or something else?

I don't think there are established standards for these kinds of connectors. Model M types of different sub-models are generally interchangeable but other manufacturers may or may not use completely different wiring. So, well, please be more precise.

edit: RJ45 connectors have a single tab on the top, while model M connectors have a tab on each side.

Title: RJ45 to ps/2
Post by: Infinite north on Fri, 23 July 2010, 23:24:58

I am talking like a cat5/6 connector. is there are any known standard for this conversion or am I just going to have to play with it? I picked up an Access Is board without a cable.

Title: RJ45 to ps/2
Post by: Findecanor on Sat, 24 July 2010, 03:23:12

RJ45 is the name of a telephone standard that uses a 8P2C connector, but I suppose that your connector has more than two connected wires.

Title: RJ45 to ps/2
Post by: Stone on Sat, 24 July 2010, 05:55:12

Are you sure the board puts out PS/2 compatible serial signals? If not you'll need something like a kbdbabel (http://www.kbdbabel.org/) converter, not a simple wire->wire convertor. You should be able to look up its datasheet here (http://www.access-is.com/datasheets.php).

There are a load of VT220 terminal keyboards at my work which I've had my eye on in the past (nice and clicky!) but they all use a unique protocol over a telephone-style connector.

Stone

Title: RJ45 to ps/2
Post by: ch_123 on Sat, 24 July 2010, 06:13:33

Quote from: Stone;205902

There are a load of VT220 terminal keyboards at my work which I've had my eye on in the past (nice and clicky!) but they all use a unique protocol over a telephone-style connector.

Must be clones. The original DEC ones are the single worst keyboard to be unleashed on mankind.

Title: RJ45 to ps/2
Post by: Infinite north on Sun, 25 July 2010, 17:07:38

I have laid out how the wires connect to the port keyboard side, but I am still at a loss as to what is what. the only wire that I am sure of is the ground (labeled scrn) but it looks like it shares a connection with the other black wire.

I flipped the bottom image so they line up the same.

(http://geekhack.org/attachment.php?attachmentid=11857&d=1280095321)
(http://geekhack.org/attachment.php?attachmentid=11858&d=1280095331)