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Bruce boy

KSI POS keyboard cable help

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Posted · Original PosterOP

Hey i recently was diggin threw my garage when i found a POS keyboard, KSI-1392.

I would like to use it but i don't have a cable, and i'm scared to buy the wrong one. The port on the keyboard looks to be an RJ45.


I e-mailed the company and they havent replied for now 3 months.


I found this PDF for the keyboard which states that it's PS/2.

If anyone can help me please


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ps/2 uses 6-7 wires... see https://pinouts.ru/Inputs/KeyboardPC6_pinout.shtml


7th would be the round metal of ps/2 jack.


Maybe they simply wired these 6-7 wires to that rj45 plug - you could open the keyboard and use a multimeter to see which pin his VCC (probably 5v) and which is ground (check continuity with minus/gnd of psu or case) then it's a matterof figuriing data an clk pins... may be written on circuit board by the jack


you can buy ps/2 extension cables and cut one jack and crimp rj45 plug : https://www.digikey.com/products/en?dc=42192

or various ps/2 cords: https://www.digikey.com/products/en/cable-assemblies/circular-cable-assemblies/448?k=ps%2F2&k=&pkeyword=ps%2F2&sv=0&pv2380=6&sf=0&FV=ffe001c0&quantity=&ColumnSort=0&page=1&pageSize=25


or plain cable: https://www.digikey.com/product-detail/en/storm-interface/1200-001003/MGR1603-ND/455968




also rj45 may be a mix of ps/2 and serial ex 4 wires for ps/2 (5v, gnd, data, clock) and 2+ wires for serial (transmit, receive)


Pin Function Dir Description
1 DATA <-> Key Data
2 n/c or DATA2 for dual PS2 - Not connected
3 GND --- Gnd
4 VCC --> Power , +5 VDC
5 CLK --> Clock
6 n/c or CLK2 for dual PS2 - Not connected
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