777662-01 Datasheet, PDF (2/6 Pages) National Instruments Corporation – Digital Camera Image Acquisition

Digital Camera Image Acquisition
Digital Image Acquisition
The PCI-1424 can acquire four channels of 8-bit data; two channels of 10-, 12-,
14-, or 16-bit data; or one channel of 24- or 32-bit data. The PCI-1422 can acquire
two channels of 8-bit data or one channel of 10-, 12-, 14-, or 16-bit data.
These boards have a serial interface and four TTL or differential digital control
lines for camera control. You can also use the adjustable onboard region of
interest (ROI) window to minimize the amount of data transferred to PC memory.
Digital Transfer Rates
The base memory configuration for the PCI-1424 is 16. You can use onboard
memory to buffer large images before transferring them to PC memory, which
increases the overall throughput. The PCI-1422 can acquire data into onboard
memory at a rate of up to 80 MB/s and transfer data to PC memory at a rate of
100 MB/s. The PCI-1424 can acquire data at 200 MB/s into onboard memory.
Onboard Image Preparation
The PCI-1424 has four 8-bit or two 16-bit lookup tables (LUTs) for mapping the
data from one value to another in real time. The PCI-1422 has two 8-bit or one
16-bit LUT(s) for mapping the data from one value to another in real time.
In addition, setting a rectangular ROI window reduces the overall data
across the PCI bus because the pixels outside the ROI are not transferred.
You can reduce the amount of data transferred across the PCI bus by scaling
or decimating the data in hardware. You can scale the image by keeping every
second, fourth, or eighth pixel.
Digital I/0
Four general-purpose, bidirectional TTL digital I/O lines are available for
triggering image acquisition.
PCI-1424 Signaling
The RS422/TTL version of the PCI-1424 can drive and receive either TTL or RS422
level signals. The driver software can access these signal levels independently
for data, control, and enable lines on the 100-pin connector. The LVDS (also
known as EIA-644) version can drive and receive LVDS and TTL signals. The
benefits of LVDS include less power consumption, longer cable lengths, less
noise, and higher clock rates.
NI PCI-1422 Signaling
One version of the PCI-1422 can receive RS422 data signals. It can also drive
and receive RS422 or TTL control and enable signals. NI Vision Acquisition
Software can access these signal levels independently for data, control, and
enable lines on the 100-pin connector. Another version of the PCI-1422 is
capable of receiving data from LVDS cameras. LVDS, also known as EIA-644,
is a low-voltage differential signal protocol similar to RS422 but with lower
voltage levels.
Multiple-Channel Data Formatter
The multiple-channel data formatting circuitry is fully programmable, so
you can simultaneously acquire from multiple channels to build up to the
complete image.
Advanced Clock Generation
The PCI-1424 has two clock outputs for generating a frequency from 500 kHz up
to 50 MHz for digital cameras that require an external clock. The PCI-1422 has
two clock outputs for generating a frequency from 500 kHz up to 40 MHz.
RS232 Serial Interface
RS232 serial lines are available on the 100-pin connector to control digital
cameras that have a serial interface.
Camera Cables
National Instruments offers 2 m cables for digital cameras, including models
by Basler, DALSA, Hamamatsu, Roper Scientific, and Pulnix. Extension cables
are also available (see the cable section). Contact National Instruments for
additional cabling options or visit ni.com/camera.
Advanced Triggering to Work with DAQ and Motion
NI vision products are designed to work with National Instruments data
acquisition (DAQ) and motion products. The RTSI bus on the PCI-1422 and
PCI-1424 routes timing and triggering signals between boards. The buses can
synchronize video acquisition between several image acquisition devices or
between image acquisition, data acquisition, and motion control devices.
I/O Connector Signals
The 100-pin SCSI connector connects to all digital video data inputs, digital
enable inputs, camera control outputs, RS232 serial interfaces, and the external
trigger signals.
Digital Trigger Accessory
The NI D2504-1, which has four BNC connectors for digital trigger lines, is
for use with National Instruments digital camera cables.
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