Specifications

38 Chapter 5: Matrox Orion hardware reference
Trigger
Matrox Orion accepts an external trigger input which allows
image acquisition to be synchronized to external events
(MIL-Lite MdigControl()). The trigger initiates the capture of
the next valid frame or field.
Direct TTL trigger Trigger signals can be received directly (pin 20 on the expanded
video I/O connector) in TTL format. The amplitude of the TTL
level signal must not exceed 5 V. A signal over 2 V is considered
high, while anything less than 0.8 V is considered low. The
transition of 0.8 V to 2 V is considered to be the rising edge.
The trigger signal’s pulse width must be greater than one pixel.
The pulse width is determined by the following:
For example, if the pixel frequency is 24.54 MHz, the minimum
pulse width is 1/24.54 MHz x 2
≈ 82 nsec. Therefore, the
minimum pulse width must be greater than or equal to 82 nsec.
▲ Caution The direct TTL trigger input is not protected or conditioned.
Use it with caution.
Opto-coupled trigger Trigger signals connected to the OPTOTRIG+ (pin 35) and
OPTOTRIG- (pin 34) input pins, pass through an opto-coupler,
a device that protects the board from outside surges. The
voltage difference across OPTOTRIG+ and OPTOTRIG- must
be between 4.05 V and 9.16 V for high level voltage, and
between -5.0 V and 0.8 V for low level voltage.
Minimum pulse width
1
pixel frequency (MHz)
-------------------------------------------------------2×=