Commission a PJLink connection before building the show
Check network access, authentication, and power-state behavior on the actual projector.
Establish the control connection
The PJLink specification defines the projector or display as the server and the controller as the client, using TCP port 4352 for control. Maintain a device inventory with its IP address, exact model, supported PJLink class, and network standby settings. Read the server greeting and follow the specification’s authentication procedure before issuing commands.
Begin with state queries
Use a documented status query such as the power-state query before testing commands that change operation. Parse the reply and report the actual state rather than assuming that a successful TCP connection means the projector is ready. Keep controller logs useful by recording commands, replies, timing, and model information without exposing passwords.
Test transitions
JBMIA’s application guide notes that standby responses may be slower, certain commands may be unavailable in standby, and connectivity can change during power transitions. Configure bounded timeouts and retries around observed behavior. Avoid issuing a stream of commands while a projector is warming up or cooling down.
Make the result repeatable
Check query behavior after a cold start, standby, power-on, and power-off. Confirm whether other controllers compete for connections. Treat the vendor’s implementation notes as part of the integration specification, and preserve a short acceptance log for each installed model.
Primary references
Read these alongside the exact device documentation. The workflow above is an editorial synthesis, not a report of a completed hardware test.