As a follow up, I found in the OptoMux Digital User Manual, 4th Edition, 1984, the following on the OptoClock:
“OPTOCLOCK is OPTO 22 PB4MDC - a 4-point digital controller with a real-time clock and integral RS-232 to RS-422 converter.”
Thus, I am going to conclude that the OptoClock is combination of the AC7 (RS-232 to RS-422 converter), a B1/PB4H combo, and a real-time clock. Given that conclusion, I will go to say that the OptoClock likely supports the same OptoMux commands as the B1, but also something for setting and reading the real-time clock.
From the OptoMux Analog User Manual, 3rd Edition, 1984, in the Introduction section, the OptoMux family is defined as the following devices:
PB4MD -> 4-point digital controller
PB4MDS -> 4-point digital controller with onboard power supply
PB16MD -> 16-point digital controller
PB16MDS -> 16-point digital controller with onboard power supply
PB4MDC -> 4-point digital OptoClock
PB4MA -> 4-point analog controller
PB16MA -> 16-point analog controller
David
Attached: photo of OptoClock information.
