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MLC 104 IP Plus Series • Operation, Features, and Cabling
23
RIght Side Panel
1 2 3
GROUN
D
+V OU
T
CM
GROUND
IR OU
T
GROUN
D
SC
P
GROUND
Tx
Rx
DISPLAY
RS-232/IR
A B C D E
COMM LINK
A B
MLS
RS-232
POWER
12V
DIGITAL
I/O
IR IN
Tx
GROUN
D
Rx
+12V IN
PRESS TAB WITH
TWEEKER TO REMOVE
LAN
SS TAB WITH
ER TO REMOVE
PRE
TWEEK
LAN
GR
OUN
D
A B
MLS
MLS
RS-232
POWER
POWER
12V
Tx
G
R
OU
N
D
R
x
+12
V
IN
+V
OU
T
CM
G
ROU
ND
IR
OU
T
G
R
OU
ND
SC
P
Tx
R
x
DISPLAY
DISPLAY
RS-232/IR
A B C D E
A B C D E
COMM LINK
IR
IN
Ground
Digital I/O
Digital I/O (digital input/output) ports
Configure each port as a digital input or output, with or w5 VDC pull-up.
Use the ports to:
• Monitor or trigger events and functions (issue commands, send email), once configured.
• Power an LED, incandescent light, or other device that accepts a TTL signal.
(switch, sensor,
LED, relay, or
similar item)
Switch,
Sensor
Figure 13.
Digital I/O Port Wiring Example
•
Digital input
— To allow the MLC 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 this port (pin 1 and ground) and
configure it for digital input. When configured as a digital input, the port measures
two states: high and low. The port accepts 0 to 12 VDC input. Threshold voltages
are <2.0 VDC = logic low, >2.8 VDC = logic high. There is also an internal, +5 VDC,
selectable, pull-up resistor for this circuit. Below are some examples of how to use
digital input.
1 2 3
GROUND
DIGITAL
I/O
MLC 104 IP Plus
Right Side Panel
Ground
Digital Input
+12 VDC
Ground
Digital Input
Sleeve (Gnd)
Ring
(signal)
Tip (+12 V)
3.5 mm
Stereo Plug
To/From
a Sensor
or
Switch,
Sensor,
or
Similar
Item
Digital Input
The port senses an external switch or contact closure by using a 2k ohm pull-up
resistor in a TTL (+5 VDC) circuit. Threshold voltages are <2.0 VDC = low,
>2.8 VDC = high.
Use the port to monitor or trigger events and functions (toggle relays, issue
commands, send email), once configured.
Figure 14.
Wiring for Digital Input
figure 13
Summary of Contents for MLC 104 IP Plus Series
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