Matrox Electronic Systems II - Manual (Page 56)

56 Chapter 5: Matrox Meteor-II hardware reference
RGB 8:8:8 (24-bit), RGB 5:6:5, YUV 4:2:2, and YUV 4:1:1 output
pixel formats. Note that YUV 4:2:2 output pixel formats are
grabbed as YUYV.
The video decoder on all form factors also features automatic
gain control (AGC). However, you can disable this feature
(MIL-Lite MdigControl() with
M_GRAB_AUTOMATIC_INPUT_GAIN set to M_DISABLE ) and
adjust the gain manually (MdigControl() with
M_GRAB_INPUT_GAIN ).
UART
Matrox Meteor-II /Standard for PCI and CompactPCI feature
a Universal Asynchronous Receiver/Transmitter (UART) that
provides an RS-232 serial interface. For example, this allows
you to remotely control a camera or a motion control unit, or
remotely communicate with a program logic controller (PLC).
The UART is programmed using the MIL-Lite command
MdigControl() with the
M_UART... control types.
Trigger
Matrox Meteor-II /Standard accepts an external trigger input
which allows image acquisition to be synchronized to external
events. The trigger is synchronous to the incoming video stream
and it is received through an opto-coupler that helps isolate the
rest of the circuitry from surges. Matrox Meteor-II /Standard
operates in next valid frame/field mode. When in this mode, the
digitizer waits for the next valid frame or field (as specified by
the DCF file) before commencing the grab. This trigger mode
functions in one of three ways:
■
Edge-triggered monoshot acquisition: The VIA (Video
Interface Asic) waits for the rising/falling* edge to capture a
single frame.
■
Edge-triggered continuous acquisition: The VIA waits
for the rising/falling* edge to start a continous grab.
■
Level-sensitive "continuous" acquisition: The VIA grabs
continuously while the level of the trigger is high/low*.
* The polarity of the active and inactive levels of the trigger
signal are software programmable.