Sierra Video Tahoe Series 16 - Manual (Page 49)

Sierra Video Systems
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Theory of
Operation
Introduction
The Tahoe 16 Series routing switchers can be configured using three different modules,
video, audio, and the processor modules. Your router includes a combination of all or
some of these modules. Schematics and circuit descriptions for each module are
described in the following section.
Module Description Part Number
Serial Control Module 504001
16x16 Video Crosspoint Module 504044
16x16 Audio Crosspoint Module 504045
*
Schematics are at the end of this chapter.
Serial Control Module 504001
The 504001 is a plug-in circuit module used as a controller for a variety of Sierra Video
Systems routing systems. The processor chosen for the 504001 is the Motorola
MC68302 microprocessor running at 16.5 MHz. This processor has 3 serial control
channels built in.
The 504001 controls the switching matrix by means of a parallel interface. This interface
is designed to have the proper timing characteristics required by the switching matrix.
Serial channel #1 is designed to connect to a RS-485 panel network. Up to 64 control
panels can be “daisy-chained” on this network. A variety of different panel types can be
used, and are available from Sierra Video Systems. The RS-485 network can be
operated at either 9600 baud or 31250 baud. The factory default baud rate is 31250.
Serial channel #2 is the Terminal port, and can be either RS-232 or RS-422, depending
on the board stuffing options. This port conforms to SVS Terminal Protocol and can be
addressed using the windows program “Hyper Term”.
Serial channel #3 is the Host port. The Host port can also be RS-232 or RS-485
depending on the board stuffing options. This port conforms to SVS Host Protocol as
Chapter 6