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Scanner Interface
A.2 Video Interface
This chapter describes the video interface, which transfers the scanning data from the scanner to the host
computer.
A.2.1
Video Interface Signals
Host
computer
(1)
VCL
This signal is a sampling clock for the video data V0 to V7.
(2)
HGATE
This signal indicates that the main-scanning video data is valid.
(3)
VGATE
This signal indicates that the subscanning video data is valid.
(4)
V0 to V7
These signal lines carry the scanning video data. Logical "0" indicates a black dot.
(5)
FAIL
This signal indicates that a device error (MPU ROM/RAM error) has occurred in the scanner.
Appendix A-4
VCL
HGATE
VGATE
V0 to V7 (8 lines)
FAIL
Figure A.2.1 Video interface signal lines
Scanner
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