Basic Camera Operation
STV674/502V-R01
3.2 Tethered
Operation
When the flash board is plugged in to USB, the firmware delays USB enumeration until the
firmware has completed its “boot up” sequence. It can enumerate in either NMS mode or Webcam
mode.
NMS mode
When connected to the PC, the flash board is set by default to NMS mode, it enumerates to use the
standard USB mass storage drivers provided by the OS.
Webcam mode
The flash board enumerates as a webcam when the
MODE
button is held down while the device is
plugged in to USB. The user must hold the
MODE
button until both LEDs have a red display.
As the webcam is a ‘Composite USB Device’, when it has successfully enumerated, it appears in
Windows Device Manager in two separate locations:
1
In the “Imaging Device” key as “NMS Video Camera (webcam)”.
2 In the “Sound, video and game controllers” key as “USB Audio Device”
Webcam mode requires ST drivers to be installed to provide the video functionality (See
). The audio functionality is provided by the standard Windows audio drivers.
