Vivotek SUPREME use IP FE9582-EHNV User Manual page 331

400 Bad Request
415 Unsupported Media Type
8.21 RemoteFocus
(capability_image_c<0~(n-1)>_remotefocus=1)
Note: This request requires Administrator privileges.
Method: GET/POST
Syntax:
http://<servername>/cgi-bin/admin/remotefocus.cgi?function=<value>[&direction=<value>]
[&position=<value>][&steps=<value>][&iris]
PARAMETER VALUE
Request is rejected because some parameter values are illegal.
Returned, if forcechk appears,when minsft is not achievable or the timeshift
feature of the target stream is not enabled.
DESCRIPTION
VIVOTEK
User's Manual - 331