CyQ 521B: Bridge interface option:
An S video cable jack is used to provide a precision 5 vdc excitation
on 2 pins while the other two pins are connected as a differential input
to the AD. May also be used as a single ended 0-5 volt AD. $50
CyQ 521D: Digital Input output option: A stereo
jack on the back of the case provides for a dry contact input (or HCMOS)
and an HCMOS (0-5 volt) output. The input may be used to commence
data transmission. $50