Matrox Rapixo CL Pro, Установка и справочник по оборудованию, Страница: 50 / 96

50 Chapter 4: Matrox Rapixo CL Pro hardware reference
When an auxiliary input signal is received in TTL format directly, it will be
clamped at a maximum of 5.7 V and at a minimum of -0.7 V to protect the input
buffer. Typically, the signal should have a maximum of 5 V and a minimum of
0 V. A signal over 2 V is considered high, while anything less than 0.8 V is
considered low.
The opto-isolated auxiliary input signals pass through an opto-coupler, a device
that protects the board from outside surges and different ground levels, and allows
the frame grabber to be totally isolated. The voltage difference across the positive
and negative components of the signal must be between 4.71 V and 9.165 V for
logic high, and between -5.0 V and 0.8 V for logic low.
You can set the direction of an auxiliary I/O signal using the MIL-Lite function
MdigControl() with M_AUX_SIGNAL_MODE .
You can set up the auxiliary signals in the DCF. Alternatively, for most commonly
used functionalities, you can configure the auxiliary signals using the MIL-Lite
function
MdigControl() (for example, with M_IO... , M_GRAB_TRIGGER... ,
M_TIMER..., or M_ROTARY_ENCODER...
).
Timers
Matrox Rapixo CL Pro has up to eight 24-bit timers (2 per acquisition path),
which operate on a specified clock source. Timer output signals allow you to
control the exposure time and other external events related to the video source
(such as a strobe). A timer output signal can be output on any of the auxiliary
output signals or auxiliary I/O signals in output mode.
The timers can use one of the following as a clock source:
• A 125 MHz internal clock source.
• A clock based on the output of another timer set in continuous mode.
• A clock based on the HSYNC or VSYNC signal of your camera.
• A clock based on the pixel clock signal of your camera.
To route a timer output on an auxiliary signal, use the MIL-Lite function
MdigControl() with M_IO_ M_AUX_IOn set to M_TIMERm . To
set up a timer, use MdigControl() with M_TIMER_... .