5.2.4 Voltage Regulation
Input voltages (+15V, -15V and +5V) are converted into several positive and negative voltages
required by the CCD and in the video processing circuits.
5.2.5 Timing
This logic block on the CCD and Video board performs the following functions:
• Generation of CCD timing signals
• Generation of Video & handshaking timing signals
• Asynchronous Reset function
• Mode control function
• Exposure control function
5.3 DIGITAL I/O BOARD
5.3.1 LVDS Version: TTL to LVDS Drivers
The Digital Video Data is latched and converted to an LVDS format (on the I/O board) for
transmission as a balanced, differential signal along the cable which consists of shielded twisted
pairs.
5.3.1.1 RS232 Interface
This is made up of a microprocessor-based circuit, which communicates via an on-board UART
with the serial port of a PC.
5.3.2 Fire Wire Version
5.3.2.1 Isochronous Data
The digital video data is latched and converted to an isochronous IEEE 1394 A (Fire Wire) format
for transmission as a serial data stream on a standard Fire Wire interface cable.
5.3.2.2 Asynchronous Data
Camera control commands from the host PC are sent via the Fire Wire interface cable in the form
of asynchronous data. The data is received and translated into internal camera control signals that
are used to set gain, offset exposure etc. in a variety of camera modes.
5.3.3 CameraLink Version
The Digital Video Data is latched and converted to an CameraLink format (on the CameraLink
board) for transmission as a balanced, differential signal along the cable which consists of shielded
twisted pairs. Command and control data (including asynchronous reset signals, under frame
grabber/software control) are also sent in accordance with the CameraLink specification.
NOTE: The command set for LVDS & CameraLink versions of the camera are identical.
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