Extron electronics IPCP Pro 250 User Manual page 26

Digital I/O (digital input/output) ports — These ports work the same way the flex
I
I/O ports work, but they do not offer analog input, and thresholds are not adjustable.
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.
Rear Panel
DIGITAL I/O
1 2 3 4 G
Heat
Shrink
Over
Shield
Wires
Switch,
G
4 Sensor
3
2
1
Figure 16.
Digital input — To allow the IPCP 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.
Unlike flex I/O ports, for digital I/O ports, threshold voltages are not adjustable.
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.
Digital output — To power LEDs, incandescent lights, or other devices that accept a
TTL signal, or to provide contact closure control for projector lifts, motorized screens,
room or light switches via an Extron IPA T RLY4 or similar device, you can use one or
more of these ports as a digital output. When a port is configured for digital output, it
offers two output states: on and off.
When the port is set to an "on" state, (the circuit is closed), the I/O pin is connected
•
to ground. Output voltage is less than 0.5 volts.
When the port is set to the "off" state (the circuit is open), the output pin is not
•
connected. If the application calls for TTL compatibility, the digital output circuit can
be set up to provide a 2k ohm pull-up resistor to +5 VDC.
•
•
Each I/O port is capable of accepting 250 mA, maximum.
eBUS port —This port is reserved for future use.
J
Digital I/O (digital input/output)
Con gure each port as a digital input or output,
with or without +5 VDC pull-up.
Use these ports to:
• Monitor or trigger events and functions (toggle relays, issue
commands, send e-mail), once con gured.
• Power LEDs, incandescent lights, or other devices that accept
a TTL signal.
Ground
Share the same ground among
Wire
digital I/O connections.
Nut
Device 4
Device 3 (Switches, sensors,
LEDs, relays, or
Device 2
Device 1
Digital I/O Port Wiring Examples
If the pull-up resistor is disabled, voltage output is determined by an external
source device.
If the pull-up resistor is enabled, voltage output is 4.3 VDC.
IPCP Pro Series • Hardware Features and Installation
similar items)
Front Panel
I/O
1 2
3 4
Digital I/O LEDs
Light when the corresponding
ports are active.
20