pciGrabber-4x4
102
PHYTEC Messtechnik GmbH 2008 L-720e_0
Configuring the Input Channels
void Set_ChannelEx(WORD nDevNo, WORD nChannel);
nChannel: Input channel to be configured (1…4)
This function is used to select the input channel. The signal is directed
by a multiplexer. The multiplexer is integrated into the video decoder.
Values:
VD-012:
Channel numbers 1-9 allowed
VD-012-X1:
Channel numbers 1-3 allowed
VD-012-X2:
Channel numbers 1-3 allowed
Note:
Configuring the input channels is not necessary when using S-Video
sources! The function
Set_S_VideoEx()
switches the channels
automatically.
Caution:
For the following reasons, when switching input channels, stop inhibit
times are to be take care of until an image for the new channel has
been digitized,.
•
Definition of the video signal normally lasts up to 4 fields before
synchronization is implemented and the color system functions
correctly.
•
Due to DC voltage decoupling between the Grabber and the
camera, different average DC levels on signal lines are present.
This can cause charge transfer effects while switching over.
•
The Grabber card’s AGC must first be configured to the new signal
level.
•
It is not possible to change channels from image to image. The
user should adhere to inhibit times of at least 80 ms. This is
dependant upon the signal sources connected.
