Pioneer CLD-V5000 Programmer's Reference Manual page 88

Two or more CLD-V5000 players can be connected via the RS-232 ports for
continuous sequential playback of discs. The following explains how to set up two
or more CLD-V5000 players for sequential playback.
1. Connections
The following figures show the RS-232C pin connections for sequential playback.
Figure 1 shows a two player connection for sequential playback. Figure 2 shows
how three or more players can be connected.
Two CLD-V5000 players connected for sequential playback
Player 1
3 RxD
Three or more CLD-V5000 players connected for sequential playback
Monitoring the AUX terminal on the players can indicate which player is
in play mode. The AUX signal can be used as a control signal for an
Audio/Video selector. (See Figure 3, below.)
Player 1 AUX 1
Player 2 AUX 1
Player 3 AUX 1
Appendix E CLD-V5000 Notes
CLD-V5000 Sequential Playback
Player 1
GND 1
TxD 2
RxD 3
Fig. 1
Player 2
TxD 2 3 RxD
GND 1
Fig. 2
Fig. 3
TP 121
Player 2
1 GND
2 TxD
3 RxD
TxD 2
3 RxD
GND 1
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Player 3
TxD 2
GND 1
E-1