There's good documentation of the OSC command here: https://www.neptunesystems.com/downloads/docs/Comprehensive_Reference_Manual.pdf
Basically it's: OSC <timeoff>/<timeon>/<timeoff> THEN ON
So if you want it to run 5 minutes every two hours, starting at the top of the hour, you'd do:
(off for the first zero minutes of the hour, on for 5, off for another 115).
If you want it to run 5 minutes every two hours, starting at the bottom of the hour, you'd do:
(off for the first 30 minutes of the hour, on for 5, off for another 85).
Basically it's: OSC <timeoff>/<timeon>/<timeoff> THEN ON
So if you want it to run 5 minutes every two hours, starting at the top of the hour, you'd do:
Fallback OFF
Set OFF
OSC 0:00/5:00/115:00 Then ON
Set OFF
OSC 0:00/5:00/115:00 Then ON
(off for the first zero minutes of the hour, on for 5, off for another 115).
If you want it to run 5 minutes every two hours, starting at the bottom of the hour, you'd do:
Fallback OFF
Set OFF
OSC 30:00/5:00/85:00 Then ON
Set OFF
OSC 30:00/5:00/85:00 Then ON
(off for the first 30 minutes of the hour, on for 5, off for another 85).