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Chapter 5---Electronics
Figure 5-6 Power On timing sequence.
Normal Operation Functions
During normal projector operation, the System Controller PCB receives commands through the remote control, tethered remote control, or a PC. Commands issued from the IR remote controls are received through IR Detectors located on the front and rear of the projector. Commands issued from a PC, Laptop, or Tethered Remote Control are received through the RS-232 serial interface ports.
The two RS-232 ports, labeled Terminal-in and Control-out, are functionally almost identical. Both ports can be used to interface with computers, switchers, or other remote controlling devices using a null modem cable. The difference is, importing and exporting of configuration data can only be performed through the Terminal-in. The dipswitch on the back of the System Controller PCB controls the baud rate (see Figure 7-2).
The System Controller PCB enables the Video Processor PCB to select between an internal and external source through the OVERLAY signal. The System
Model 250 Service Manual |