Extron electronics IPL EXP I/O Series User Manual page 34

• Digital I/O digital output with pull-up enabled:
• When the port is configured for pull-up, switch 2 is closed, activating the +5.0 VDC pull-up resistor.
• When switch 1 closes, the port is on and the front panel LED (IPL EXP RIO8 only) is on.
• When switch 1 opens, the port is off, and the front panel LED (IPL EXP RIO8 only) is off.
• Example application, digital output with pull-up: controlling another device via its contact closure input
port
Connect the digital I/O port to the contact input port of another device, such as an Extron DTP transmitter.
When activated, the digital I/O digital output port momentarily shorts pin 1 to ground (pulsed contact
for 0.5 seconds), closes switch 1, which selects the input on the connected device.
+5.0 V
SW 2
CTL
SW 1
Figure 15.
Digital I/O Digital Output Application With Pull-up:
Contact Closure Input Selection on a Connected Device
1k ohms
Digital
I/O
Voltage
Protection
GND
DTP T UWP 232 D
R
IPL EXP I/O Series • Hardware Features and Installation 26