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MLC 104 IP Plus Series • Operation, Features, and Cabling
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•
Digital output
— To power an LED, incandescent light, or other device that
accepts a TTL signal, or to provide contact closure control for a projector lift,
motorized screen, room or light switch via an Extron IPA T RLY4, 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. The I/O port is capable of
accepting 250 mA, maximum. 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.
MLC 104 IP Plus Series
+12 V
SW 1
I/O
GND
2k ohms
SW 2
+5.0 V
CTL
The MLC 104 IP Plus cannot
provide TTL level outputs like
some of the IP Link interfaces.
Switch 2 cannot be enabled when
I/O pin is used as an output.
When used as a digital output, a
digital output pin on the MLC may
not work with certain devices
requiring contact closure control.
Although the illustration at right
shows a short to ground when
switch 1 is enabled, the actual
circuit does not provide a
completely grounded output.
For any devices requiring contact
closure control, it is
recommended that relays be
used.
Pin 1,
2, or 3
of the
Digital
I/O Port
Digital
I/O
Port
GND
+
MLC 104 IP Plus Series
+12 V
390
ohms
LED
+5 V
External
Source
Digital
Output
GND
CTL
The digital output
pin drives an LED
using an external
+5 VDC source.
The LED lights
only when the
I/O pin is set to
“on” (switch 1 is
closed).
SW 1
NOTE:
The digital I/O pin is capable of sinking a maximum of 250 mA from
12 VDC, max.
Содержание MLC 104 IP Plus Series
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