I would like to read linear distance measurement from my digital caliper.
Caliper itself has a simple connector, that has 4 contacts. Just 4 plain strips on the PCB. I found some photos here that explain more: http://www.steves-workshop.co.uk/tools/milldro/milldro.htm
strip 1 is: -V strip 2 is: data strip 3 is: clock (What is the use for clock?) strip 4 is: +V
What interface would this be and how is it operated?