I see you found the Yardo site, created by a regular RCM participant
Nick M.

There is also more info about interfacing the Chinese scales in the
archived Files section of the Yahoo group CAD_CAM_EDM_DRO (membership
required).
I haven't looked at the more recent files, but the ones I did see had
full explanations of the scales' imbedded features and output signals.

Here's a link to a previous discussion on the topic

http://groups.yahoo.com/group/CAD_CA.../message/63433

WB
................

RoyJ wrote:
Someone posted a writeup (late '05???) on hacking into a digital caliper
to get a data output. I thought I bookmarked it but searching was to no
avail. Anyone got a link?