Spending so much time sat in front of a PC, I am used to the way it is now and am reluctant to change it, I changed keyboard a few years ago and got RSI in my little finger from stretching to find the Ctrl Key which was further away than I was used to!
I will find a way around it now I know it is nothing stupid I am doing and nothing I can do about it in Mach3. I had not thought about setting up a different user account in XP, that may be the best way forward.
The Calipers output a wierd binary encoded absolute position see
http://www.yadro.de/digital-scale/protocol.html The ones I am using on the mill give the 2 * 24 Bit protocol.
The YADRO Hardware interface reads the values from the scale and send them to the serial port when requested.
My software (and the YADRO DOS Software) calculates the actual position from the binary data stream.
I am currently assuming I will need to write some software to be interface between a Mach3 Macro and the YADRO interface so that the macro can populate the DRO's in Mach3
Simon