Acquisition; Coaxpress Trigger Signals And Control Messages - Matrox Rapixo CXP Installation And Hardware Reference

Matrox Rapixo CXP acquisition 39
Matrox Rapixo CXP is also equipped with an overcurrent protection mechanism;
if this fails, there is also a resettable fuse that can sustain a current of 1 A.

Acquisition

Matrox Rapixo CXP accepts 8-, 10-, 12-, and 16-bit video data. All data is
transmitted in packets over a CoaXPress link.
The Matrox Rapixo CXP CoaXPress interface is responsible for decoding packets
from the video sources, as well as buffering incoming data before it is written to
memory. Video sources can be frame or line-scan video sources.

CoaXPress trigger signals and control messages

To communicate exclusively with the video source(s), Matrox Rapixo CXP
supports CoaXPress trigger signals going to the camera and control messages.
Trigger packets, which are sent to the camera, are virtually represented as trigger
signals. Control messages constitute the basic communication mechanism
between the video source(s) and the board.
For each video source connected to the board, Matrox Rapixo CXP supports a
CoaXPress trigger output signal. A CoaXPress trigger output signal can be sent
from the board to a video source to initiate image acquisition or to optionally
control the exposure time.
For data coming from the camera (downlink) at speeds of up to 6.25 Gbits/sec
(Quad CXP-6), the maximum trigger rate is approximately 150 KHz; for data
coming from the camera at speeds of 12.5 Gbits/sec (Quad CXP-12 and
Pro Quad CXP-12), the maximum trigger rate is approximately 300 KHz.
Depending on your camera, you might have the ability to double the trigger rate.
See your camera's documentation for more details.
To send a trigger output signal to the camera, you use the MIL-Lite function
MdigControl() with M_IO_SOURCE + M_TL_....
For more information on how to use the auxiliary input and output signals, refer
to the Auxiliary signals section, later in this chapter.