Vivotek SUPREME use IP FE9582-EHNV User Manual page 333

steps 1 ~ <motor_max>
iris N/A
Motor's moving steps.
It works only if function=zoom | focus and direction=forward |
backward.
<motor_max> is refer to remote_focus_focus_motor_max or
remote_focus_zoom_motor_max which replied from
"function=getstatus"
Open iris or not.
It works only if function=auto | scan.
VIVOTEK
User's Manual - 333