Okay, here's what I've been able to dig up off the Internet about the RS-232 commands used to control the Pioneer LD-V1000 LaserDisc. While my unit is a LD-V2000, I suspect the commands should fundamentally be the same.
I'll need to hack to together a patch cable to connect a PC serial port to the DIN plug on the LD before I can try this. The old terminal program in Windows should be useful for feeding the commands to the deck.
Info follows:
Credit for the following goes to an original post from: Jim Jackson
Communication protocol:
* Computer activates CTS (pin 5) of RS232 port.
* Then sends a command sequence and expects 'R' and carriage return (CR).
* ASCII digits used for addresses, etc. Returns frame# as ASCII digits.
* Player is string oriented and reverse-polish (arg then verb).
COMMANDS CHARS HEX DECIMAL COMMENT
----------------------------------------------------------------------------
Door Open OP open the door
Reject RJ stop disc rotation
Start SA start disc rotation
Play PL (address)PL
Pause PA
Still ST still frame
Step Forward SF
Step Reverse SR
Scan Forward NF
Scan Reverse NR
MultiSpeed FWD MF (address)MF
MultiSpeed REV MR (address)MR
Speed SP integer SP
Search SE address SE
Stop Marker SM address SM
Frame FR set frame mode
Time TM set time code mode
Chapter CH set chapter mode
Audio Control AD integer AD
0=off,1=Ch1,2=Ch2,3=stereo
Video Control VD integer VD 0=off,1=on
Display Control DS integer DS 0=off,1=on
Clear CL clear entry or mode
Frame # ?F get frame number
Time code # ?T get time code number
Chapter # ?C get chapter number
Player active? ?P P00=door
open,P01=park,P05=still
Disc status ?D 5 bytes and CR returned
(and a few others....)
SERIAL PORT CONNECTION:
Computer Player
---------- --------
TxD 2 3 RxD
RxD 3 2 TxD
CTS 5 4 DTR
GND 7 1 GND