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DOC: 1310B
REV: 10-12
LC372SR SOUND REINFORCEMENT MODULE
INSTALLATION INSTRUCTIONS
Pin
Function
CAT5 Color Code
5
+48V DC
Blue/W
6
Data TX –
Green
7
–48V DC (Ground)
Brown /W
8
–48V DC (Ground)
Brown
Table 4 -
Power and Network RJ45 Connector Wiring
7. Aux Audio Input
This connector provides an input for a balanced or unbalanced stereo (or mono) audio source. Both inputs are
summed to mono and are controlled through the software. This input is ideal for connecting an audio source to
the system when it is permanently installed in the room.
8. Speaker Out
This connection is for the output of the power amplifier and used to connect to the local room loudspeaker or
loudspeakers. This output is for 25V loudspeakers and has a maximum power output of 30W.
NOTE:
It is possible to use 70V loudspeakers with the 25V amplifier output, but the power factor for the transformer tap
will be 1/8 of the listed tap setting. For example, a 70V loudspeaker tapped at 100W will only draw a maximum of 12.5W
when connected to the 25V amplifier output.
9. Line Out
This is a balanced line level output that can be used to connect to an external audio amplifier, hearing assistance
system, or a recording device. The mix is the same as what is available at the speaker output, however this output
does have its own output level adjustment.
10. Mute
This is used to attach an external mute switch to the device. When a closure is present between the pins, all
messages, live announcements, intercom calls, and bells will be muted in the room. Emergency messages will
override the mute if it is active. This function is to give teachers the ability to place the system into a
do not disturb
mode for student testing or other special situations.
11. Power
This terminal is not currently used and reserved for future implementation.
12. Relay Output Jack
The LC372SR has four Form C relays that are terminated at this connector. Relays 1 and 2 provide a momentary
contact closure used to synchronize the clock in the room to the system time. The exact time and duration for
this closure is globally configured in the control software at the headend. The functions of Relays 3 and 4 are
configured in the software.
Relay 1
AUX AUDIO INPUT
+ - S + - S
+ - S + -
V
M
SPKR
OUT
LINE
OUT
MUTEPOWER
FORM C RELAY OUTPUTS
NC
NO
C
NC
NO
C
NC
NO
C
NC
NO
C
ETHERNET/
IED MIDSPAN
Model# LANcom LC372SR
HANDSET
INTERFACE
AUX
INPUT
CALL SWITCHES
REMOTE MIC
IR RECEIVER INPUTS
Relay 2
Relay 3
Relay 4
Figure 4 -
Relay Connector
