Sensoray 611 - Manual (Page 4)

4
Special handling instructions
The circuit board contains CMOS circuitry that is sensitive to Electrostatic Discharge (ESD).
Special care should be taken in handling, transporting, and installing circuit board to prevent ESD
damage to the board. In particular:
• Do not remove the circuit board from its protective anti-static bag until you are ready to
install the board into the enclosure.
• Handle the circuit board only at grounded, ESD protected stations.
• Remove power from the equipment before installing or removing the circuit board.
Introduction
The 611 PCI frame grabber allows the capture of monochrome and color images from a variety of
analog video sources into computer memory (RAM). The 611 is designed to work with standard TV
signal sources, compatible to the following video standards:
§ color: NTSC-M, NTSC-Japan, PAL-B, PAL-D, PAL-G, PAL-H, PAL-I, PAL-M, PAL-N, SECAM;
§ monochrome: CCIR, RS-170.
The 611 digitally locks to the incoming video signals providing a stable output regardless of the signal
source. The input’s 4:1 multiplexer allows the selection between four composite or three composite
and one Y/C (S-Video) analog video inputs, which makes it possible to connect up to four video
sources to the frame grabber. The signal components (luminance and chrominance) are digitized with
two separate 8-bit A/D converters. Low-pass filtering and double over-sampling of the input signal
provide precise digitization with no aliasing artifacts. The digital signal is then scaled and/or cropped to
the desired dimensions, if necessary. The scaled image is transferred to the host RAM using the PCI
bus mastering mode, which requires minimum CPU attention. An on-board FIFO provides necessary
buffering, minimizing the probability of image loss.
An 8-bit general purpose I/O port allows interfacing of the 611 to external hardware, which could be
used, for example, for triggered image acquisition.
System Requirements
The 611 is designed to work with 32-bit, 33 MHz, 5 V PCI bus. An important system requirement is
fast PCI-to-DRAM transfer. Some systems may not provide bandwidth sufficient for image transfer,
which may result in image corruption.