Welcome to the forums! You're right, form 1784 does not address quad counters. However, form [1823 does. There's a little on them in [URL="http://www.opto22.com/documents/1465_OptoMMP_Protocol_Guide.pdf"]1465](http://www.opto22.com/documents/1823_Using_Quadrature_Counters_Technical_Note.pdf) as well.
But to answer your question, for a simple quad counter, you would just use these commands in PAC Control (should be very similar in OptoControl).
Get & Clear Counter
I hope that helps!