OK, I see.

So, if you want to move the trackbar to position $28 you will use

Code:
HserOut [$01,$05,$00,$00,$28,$2C]
and the slider will goto position $28.

But I guess you have to set beforehand the two ends of the trackbar? I mean the zero can be 100 and the maximum position 200, or whatever.

Can you try and see if you can move the trackbar just by sending straight in values? and the CRC computed by hand.

Then you may do more complicated things.

Ioannis