Christie GraphXMASTER RPMS-D100U User Manual page 12

SOURCE SETUP
Figure 2.13. Connecting to the RS-232 input connector
When connecting multiple projectors in a network with serial communication,
connect the controlling source to the RS-232 IN connector of the first projector in the
network. Then take another serial communication cable and connect one end to the
RS-232 OUT connector and the other end to the RS-232 IN connector of the next
projector. Continue this pattern of connection with all projectors. The last projector in
the network will only have a connection to the RS-232 IN.
Figure 2.14. Looping RS-232 cables between multiple projectors
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RPMS, CS50 & CS70-D100U/UF User's Manual