Extron electronics IPL Pro CR88, Руководство пользователя

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IPL Pro Series • Hardware Features and Installation 18
Unidirectional Control and Communication Connections
E
Input (contact closure input) ports (see figure 7, on page 13) — To allow the IPL
to monitor devices to trigger events, connect a switch, sensor, or similar item to one of
these ports. Wire the ports as shown below.
3 4 2 1 G
7 8 6 5 G
INPUT
3
4
1
2
7
8
5
6
INPUT
Input (Contact closure input)
Each port senses external switch or contact closure by using a
1k ohm pull-up resistor in a TTL (5 VDC) circuit.
Use these ports to monitor or trigger events and functions
(toggle relays, issue commands, send e-mail), once configured.
Input LEDs
Light when the
corresponding
ports are active
(tied to ground,
logic low).
Rear Panel Front Panel
(Switches, sensors,
relays, or similar
items)
Share the same ground
among contact input
connections.
Switch,
Sensor
2
1
3
4
G
Heat
Shrink
Over
Shield
Wires
Ground
Device 4
Device 3
Device 2
Device 1
Wire
Nut
Figure 11. Wiring the Contact Input Ports
A 1k ohm pull-up resistor in a TTL (5 VDC) circuit senses external switch or contact
closure. After these ports have been configured, when the circuit between a signal
pin and a ground pin is closed, each port can trigger events (such as toggling relays,
issuing commands, or sending an e-mail).
•
When an external switch closes (shorts to ground, logic low), the port is on and the
front panel LED is on.
•
When the external switch opens (logic high), the port is off. The front panel LED is
off.
•
Example application: connecting a two-position switch
+5.0 V
1k ohms
SW 2
SW 1
Two-position
Switch
Contact
Input
GND
Voltage
Protection
CTL
Figure 12. Contact Input Application: Two-position Switch With Pull-up
Two-position switch is open: logic high, front panel LED is off.
Two-position switch is closed: logic low, front panel LED is lit.
Rev. E,
09/18:
Did minor
rewording
of the
contact
input
material,
added an
example
application
based
on tech
standards.