Extron electronics HC 404 User Manual page 22

Push button keypad
You can connect an external push button keypad to these ports. Extron offers a variety of
button panels such as the CCR Series products, but you can use any pushbutton switch or
keypad of your choice.
NOTE: The Extron CCR-4BLB AAP
closure connection and its own power connection. The tally connections are not
needed. Other devices might use both contact and tally connections.
1. Make the contact closure connections,
as shown at right. Wire a male
4-pole captive screw connector as
follows and plug it into the Contact
connector:
Contact closure input (2, 3,
•
or 4) pins — Insert the contact
connections to these pins as
desired. Momentary closure
of one of these pins to ground
selects the corresponding
input (2, 3, or 4). Selection
is triggered at the closure
(grounding) of the pin, not the
opening.
Ground (G) — Insert ground
•
wire to this pin.
2.
Make tally output connections,
as shown at right. To identify the
currently selected input when the
front panel buttons are not visible,
connect a device such as an LED
light to the Tally connector 2, 3, or 4
pin and the +V pin. When an input is
selected (by keypad or front panel),
the corresponding tally out pin is set to logic low, which completes a circuit and sends
power (+5 VDC) to the connected LED.
Wire a 4-pole captive screw connector as follows and plug it into the Tally connector:
Tally output (2, 3, or 4) — Insert connections to these pins as desired to control
•
the LEDs for in the contact closure push buttons. When an input is selected, the
LED for that input is active.
Voltage (V+) — Insert the power wire for the contact indicator device into the
•
opening for the +V pin. Some LEDs require a resistor connected in series at this pin,
so see the documentation from the manufacturer to determine what to use for your
device.
3. To test the connections, power on the system, then press the button on the keypad
to switch the connected input to the output after the system is powered on. The input
selection should change and the corresponding button should light.
contact closure remote requires only the contact
REMOTE
CONTACT TALLY
2 3 4 G 2 3 4 +V
G
Ground
4
Contact
3
2
HC 404 System • Hardware Features and Installation
NOTE: Some LEDs
HCT 103
require a resistor
Rear
Panel
connected in series
at the V+ pin.
Extron CCR Series
button panels do
not. See the
requirements from
the manufacturer
of the button panel
or LEDs you plan
to use.
Voltage
5 V 12 V 24 V
Resistor N/A 4.52 K 13 K
Rating
(ohms)
Tally
+V Voltage
Indicator
4
Tally out
(LED)
3
2
Tally Output
Contact
Closure
Switch
Contact Closure
14