Matrox Helios Series Installation And Hardware Reference page 56

56 Chapter 4: Matrox Helios hardware reference
Trigger
synchronize image acquisition with external events), quadrature input, field
polarity, timer clock input, or user-defined signals (for example, to synchronize
an application with a user-defined event).
The board supports auxiliary signals in different formats:
Auxiliary signals
LVDS camera control signals (output).
TTL auxiliary input or output signals.
Opto-isolated auxiliary input signals.
LVDS auxiliary input signals.
LVDS auxiliary output signals.
Note that the opto-isolated signals pass through an opto-coupler, a device that
protects the board from outside surges and different ground levels, and permits
total electrical isolation from the frame grabber.
You specify the purpose of the auxiliary signals in the DCF. You can then program
these signals using the MIL-Lite function MdigControl() with
, or
M_TRIGGER...
For each PSG, you can program two auxiliary signals as external trigger inputs.
For each PSG, you can also program two path-independent auxiliary signals as
trigger inputs.
Each PSG can operate in one of the two following trigger modes; the mode is
specified by the DCF:
• Next valid frame/field mode. In this mode, the board 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 board waits for the rising/falling
edge to capture a single frame.
- Edge-triggered continuous acquisition. The board waits for the rising/falling
edge to start a continuous grab.
M_GRAB_EXPOSURE...
# per path
4
2 (+2 depending on type of signal)
depends on type
(2 reserved for P0, 2 not specified)
depends on type
(2 reserved for P0, 2 not specified)
2
.
# total
8
6
4
4
4
,
M_USER...