Extron Electronics MLC 104 Plus Series - Manual (Page 119)

5-15 MLC 104 Plus Series • Special Applications
PRELIMINAR
Y
5. If you want to use the MLC’s buttons to control Extron switcher inputs other
than the default inputs 1-4, remap the front panel buttons.
a.
Click the Front Panel tab.
b. Click an input button.
c. Select the desired switcher input number from the Switcher Input list
box. In the example shown above, a document camera is connected to
input 12 of the switcher.
d. Repeat steps 5b and 5c as desired to remap additional buttons to other
switcher inputs.
6. Complete the rest of the configuration as desired, then save the project and
build and upload the configuration to the MLC.
Using Digital Inputs
The MLC can monitor devices such as push buttons, switches, a motion sensor,
moisture sensor, tally feedback output, or a similar item via a digital input port.
When one of these ports is configured as a digital input, it is set to measure two
states: high and low. The port accepts 0 to 12 VDC input. The threshold voltages
are as follows: a voltage below 2.0 VDC is measured as logic low, and a voltage
above 2.8 VDC is measured as logic high. There is also an internal, 2k ohm,
+5 VDC, selectable, pull-up resistor for this circuit for contact closure detection.
The following examples tell how you can use these pins for digital input.
Using a motorized surface access enclosure to trigger digital
input
One application for digital input on the MLC is monitoring the up/open and
down/closed status of an Extron HSA 822M motorized surface access enclosure to
signal when to power on or power off a projector or display.
1. In the Advanced Configuration tab in the Global Configurator software,
configure the MLC’s digital I/O ports (ports 2
and 3 in this example) for digital input with pull-
up, as shown at right.
2. Set up a monitor for each port in the Monitor tab
of Global Configurator.
a.
Click the Monitor tab ( ), then
click Add Monitor (near the bottom of the GC window). The Monitor
Conditions Wizard window appears.
b. Type in the name of the first monitored condition: HSA in up position.