As DCS-942L IP cam is compatible with "NVSCGI APIs" (search this string on a search engine and you will find some useful PDF docs), many features of this IP Cam may be enabled or disabled using any web browsers, for example we can manage the motion detect.
So to get informations about the current settings of motion detect, we have to write the following phrase/string on any browser:
http://[IPCamAddress:port]/config/motion.cgi
it shows some parameters related to motion detect (eventually if browser asks you to save a file, save it on desktop and open it using a text editor). Logically the IP cam will ask you admin's user-id and password.
To disable motion detect, we have to write:
http://[IPCamAddress:port]/config/motion.cgi?enable=no
To enable it again:
http://[IPCamAddress:port]/config/motion.cgi?enable=yes
To set some parameters such as sensitivity and pir we have to use following parameters:
http://[IPCamAddress:port]/config/motion.cgi?sensitivity=[number]
http://[IPCamAddress:port]/config/motion.cgi?pir=[yes/no]
To set several parameters, we have to use digit "&" inside string - for example
http://[IPCamAddress:port]/config/motion.cgi?sensitivity=[number]&pir=[yes/no]
I suggest you to read the documentation because using "NVSCGI APIs" it is possible to manage the IP cam everywhere and quickly.
Hope this may help you.