Hi Steve,

Thanks for the input.

Your suggestion would be a fair piece of work on this end. The circuit is hardwired into a circuit board and would require cutting and jumping several lines.

The Optrex manual says when connecting a 4 bit bus, use the higher order bits, 4 thru 7. The lower four should be tied to ground.

See table 1.3 on page 11:

http://www.optrex.com/SiteImages/Lit...mcman_full.pdf

Still... if you have reason to believe that your suggested fix will work, I'll get cuttin'.

Could you please take a look and elaborate on your suggestion.

Thanks,

Ross