Pioneer DVD-V7200 Industrial DVD Player RS-232C - Manual (Page 85)

DVD-V7200 Internal Registers
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The function is identical to the Mark Time/Frame command (reference 8.14 above).
8.16 Mark Index
The register contains the index number as a marker.
The function is identical to the Mark Time/Frame command (reference 8.14 above).
8.17 Video Control
The player uses the register to control the Video ON/OFF switch.
8.18 Audio Control
The player uses the register to select the audio output.
8.19 Display Control
The player uses the register to control the Character Display ON/OFF switch.
The Character Display tracks on-screen information such as time/frame number,
title/track number, etc.
8.20 Registers
There are three (3) registers, A, B and C. The registers are reserved exclusively for CPU
internal operations.