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RS-232/Remote Control, cont'd
Windows-Based Program Control
The Signal Enhancement Control Program is Windows
compatible and provides remote control of the following:
• Input selection
• Video adjustments
Installing the software
The program is contained on a single 3.5" diskette and can be
run from the floppy drive, or it can be installed and run from
the hard drive.
To install the software on the hard drive, run setup.exe from the
floppy disk and follow the screen instructions.
By default, the Windows installation creates a C:\S_ENHANC
folder and places two icons (Signal Enhancement Products
Control Program and Signal Enhancement Products Help) into a
group named "Extron Electronics".
Using the software
1.
To run the software, double click on the Signal
Enhancement Products Control Program icon
in the Extron Electronics program group.
2.
Click on the comm port that is connected to the CD 900's
RS-232 port.
3.
Extron's Signal Enhancement Products Control Program
window (figure 11) displays the current input selection by
marking it with a red dot and shows both slider controls
and numeric values for the picture controls.
Figure 11 — Signal enhancement program
window
Using the help system
For information about program features, you can access the help
program in any of the following ways:
CD 900 Decoder • RS-232/Remote Control
4-6
• From the Extron Electronics program group, double-click on
the Signal Enhancement Products Help icon.
•
From within the Windows-based signal
enhancement program, click on the Help entry on the task
bar.
• From within the Windows-based signal enhancement
program, press the F1 key.
Contact Closure Control
The RS-232 connector provides a way to select an input to the
CD 900 using a remote contact closure device and indicate the
selected input on the contact closure device. Contact closure
control uses pins on the RS-232/Remote connector that are not
used by the RS-232 interface. The contact closure pin
assignments are shown in the table on page 4-2.
To select a different input number using a contact closure
device, momentarily short the pin for the desired input number
to logic ground (pin 5). To force one of the two inputs to be
always selected, leave the short to logic ground in place. The
short overrides front panel input selections.
The tally pins can be used for remote indication of the selected
input. Tally #1 or tally #2 indicate the selected input number
with a logic low (0 volts). If an input is not selected, the
associated tally pin is at logic high (5 volts).
Figure 12 can be used as a guide to design and build indicator
circuits for the tally pins. Since there is no voltage source on the
RS-232 connector, an external voltage source is required.
Recommended relays
Manufacturer
General Low current
Aromat
DS2
TQ
ITT/Panasonic R-Z-5C A5W
Omron
G5Y
G6H
Incandescent indicator circuits
+5V (PIN 13)
N/C
1N916
Tally pin
External power
Using a relay
and external power
Figure 12 — Remote indicator circuits
CD 900 Decoder • RS-232/Remote Control
LED indicator circuit
External power
LED
Tally pin
330 Ohm
External power
Resistor value
depends on current
requirement of the lamp
330 Ohm
External
power
Tally pin
Using an opto-isolator
and external power
4-7
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