Pendant - Update

Just found a PS2 / 5 pin DIN convertor and done a pin out.
On the PS2 plug it has 6 pins but the DIN only has 5.
The black earth lead isn't connected on the 5 pin,not even to the case, should
it be ?
The other pins are, looking at the front of the DIN plug with the pins at the
bottom.
3 o'clock not connected
5 o'clock black
6 o'clock yellow
8 o'clock red

Actually the 5 and 8 o'clock pins are equally spaced so they are more like 5.30
and 7.30
Okay guys which are the clock and data pins.
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Regards,
John Stevenson
Nottingham, England