Extron electronics HC 400 Series User Manual page 33

Digital I/O
Digital I/O (digital input/output) ports (see
M
the HCR 102 receiver to monitor devices to trigger events, connect switches, sensors,
LEDs, relays, or similar items to these ports, which can be configured as digital inputs
or outputs, with or without +5 VDC pull-up. These ports can trigger events or functions
(such as triggering relays, issuing commands, or sending an e-mail) that have been
configured using Global Configurator Professional or Plus. By default these ports are set
to digital input mode with pull-up disabled.
DIGITAL I/O
HCR 102
Rear Con gure each port as a digital input or output,
Panel with or without +5 VDC pull-up. Use these ports to:
1 2 G 3 4 G
• Monitor or trigger events and functions (toggle relays,
issue commands, send e-mail), once con gured.
• Trigger LEDs, incandescent lights, or other devices
that accept a TTL signal.
Ground
Switch,
G
4 Sensor
3
G
Indicator
2
LED
1
Figure 14. Digital I/O Port Wiring Examples
Digital input — To allow the HCR 102 to monitor external devices that do not use
RS-232 communication, connect a switch, motion sensor, moisture sensor, tally
feedback output, button pad, or a similar item to a digital I/O port and configure it for
digital input. When configured as a digital input, the port is set to measure two states:
high and low. The port accepts 0 to 25.3 VDC input.
Threshold voltages are not adjustable. The thresholds are:
2.0 VDC — port on, logic low
•
2.8 VDC — port off, logic high
•
There is also an internal, selectable, pull-up resistor connected to +5 VDC, which you
can use if the connected device does not provide its own power.
figure 7
Digital I/O (digital input/output)
Share the
same ground
among I/O
Wire
connections.
Nut
(Switches,
Device 4
sensors,
Device 3
LEDs,
relays, or
Device 2
similar
Device 1
items)
HC 400 Series • Hardware Features and Installation
on page 16) — To allow
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