Sierra Video 503108 RS-232 - Manual (Page 10)

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Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • www.sierravideo.com
503108 RS-232 INTERFACE
39. During the second half of the cycle (E pulse
going high) these lines become the data lines.
Pins 22 to 29 are 8 more address lines (non-
multiplexed) giving a total of 16 address lines for
a 64K address range. The decoder U10 uses the 4
most significant address lines to decode into
sixteen 4K spaces. They are:
0000-0FFF Processor Internal
1000-6FFF Unused
7000, 9000, B000 I/O Writes U6, U4, U2
8000, A000, C000 I/O Reads U5, U3, U1
D000 RAM U7
E000-FFFF EPROM U8
Address 0000-0FFF. These are used internally in
the processor for some RAM, reading the
thumbwheel, writing to the LED display, and the
serial port.
Address 7000-C000. These are the read/write
buffers to the outside world of the crosspoint
cards and the control panels. The processor
monitors these lines for crosspoints being set by
control panels. It also writes these lines to set
crosspoints.
COM Port number to use (1-4) 1
IRQ number of COM port (0 fro default, 1 - 7 IRQ1 - IRQ7) 0
Address of COM port (0 for default, else address in hexadecimal) 0000
COM port speed 9600
Dispay color useage Use special VGA palette (VGA required)
Select field
Space Next value
Bksp Back up
0-9AF Hexadecimal digits
RTRCTRL program V01.07 (C)1991-1994 Sierra Video Systems
ESC:Quit ENTER:Main Screen F9:Router Info S:Save Setup Info
F9 is mainly used as a diagnostic tool. The normal
exist from the setup screen is to press ENTER. At
this point RTRCTRL queries the router and
automatically sets up a status display screen.
RTRCTRL works with any Sierra Video Systems,
Inc. router. Depending on the size of the router,
RTRCTRL may or may not be able to fit the
entire router status on a single screen. If the router
has more outputs than will fit on the screen at one
time the display scrolls as needed to show the
desired output.
From the Main Screen the operator can return to
the Setup Screen, Router Info or exit RTRCTRL.
503108 CIRCUIT DESCRIPTION
The 503108 module is based on a Motorola
microprocessor, the MC68HC11 (U8). This is an
8 bit single chip device using a multiplexed data-
address scheme. The processor crystal is a 4.9152
MHz. This is divided by 4 to obtain an E pulse
frequency of 1.2288 MHz. During the first half of
a processor cycle (E pulse going negative) pins 30
to 37 are address lines. These lines are stored for
the duration of the cycle with the transparent latch
U9 by the address strobe from the processor, pin