MBus Cable and friends (problems)

Hi, I have had a go at creating the MBus cable.
From what I can tell it is made correct.
When using Rolis Tools (1.8/1.9) and choosing auto detect
I recieve a "Read Error 995".
If I dont plug the cable into the phone it finds nothing
If I short circuit the MBus/Ground leads on the cable I get a "Write Error 995"
Could anyone help if possiable.
My phone is a 2100 and i have been connecting to the copper plates on the bottom of the phone (between the power input jack and ther headset input Jack.)
Also if anyone know, what power(voltage) should be comming out of the MBus cable, connecting my multimeter to the Mbus/ground I get an unsteady 4V.

Anouther note, if I connect the MBus cable (mbus/ground) to an LED and start logomanager, the LED phases on and off. Is this the program probing for a connection or is it a sign that my capacitors are fubar.

Please help,
James