Christie roadie 25k User Manual page 39

INSTALLATION AND SETUP
Figure 2.33. Typical RS422 Network
You can also connect by RS232 or RS422 (see Figure 2.34), in which case either
type of serial communication must also reach the other type of port. You must enable
this joining of network ports in the Communications menu—set the "Network
Routing" option to "RS232 and RS422 Joined". Serial messages will reach all serial
ports.
Figure 2.34. Examples of Joined RS232 and RS422 Networks
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Roadie 25K User's Manual