Switches / Lights Connector
Pinout
Pin 1
Talk button
Pin 2
Cough button
Pin 3
NC
Pin 4
Override button
Pin 5
Private button
Pin 6
Ground
Pin 7
Ground
Pin 8
Ground
Pin 9
Ground
Pin 10
Ground
Pin 11
Talk LED
Pin 12
Cough LED
Pin 13
NC
Pin 14
Override LED
Pin 15
Private LED
The LED output pins p12 VDC through 160Ω current
limiting resistors when they are turned on. When turned off,
they are floating. LED indicators should be connected between
these pins and ground pins on this connector.
The switch inputs have internal pull-ups to +3.3 VDC
and are ESD protected. When a pushbutton input is needed,
normally-open switches should be connected between one of
these inputs and a ground pin.
SPEAKER Connector
This amplifier output is a standard ¼" TRS phone connector. It
is used to connect a 4Ω minimum loudspeaker to the NM 1 for
monitoring the selected CobraNet audio channel. The NM 1
power amplifier can deliver 1 watt continuously into an 8Ω load
with a pink noise signal that has a 15 dB crest factor (see data
sheet for detailed specifications). The output configuration re-
quires that the positive and negative signals must remain isolated
from the chassis and from ground. The plug used
must
be TRS;
use of a TS (i.e. mono) phone plug shorts the power amplifier
and causes a malfunction.
The threaded metal bushing allows use of a ¼" phone plug
with a threaded locking ring (e.g., Switchcraft Number 298).
The connector sleeve is connected directly to chassis ground;
the tip is the positive signal; the ring is the negative signal.
MIC INPUT Connector
The balanced microphone input is an industry standard XLR-3
type connector (see the NM 1 Data Sheet for specifications).
Gain is adjusted via SNMP control. IEC 61938 P48 compliant
48V phantom power is provided.
Connect pins 2 and 3 to the balanced output of the micro-
phone. Pin 1 is directly connected to the chassis; for best noise
immunity, the microphone cable should have a braid or double
wound shield. If a cable such as Belden 1800F is used that has
both a wire shield and a drain wire, then all the shield wires and
not just the drain wire should be connected to pin 1 of the XLR
connector.
–
+
Figure 1. Speaker wiring
(–)
(+)
3
1
2
CASE
OPTIONAL
Figure 2. Mic wiring
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
1
2
3
SysName
87
6
5
4
3
2
10
F E D C B A
9
87
6
5
4
3
2
10
F E D C B A
9
87
6
5
4
3
2
10
F E D C B A
9
4
NM 1
Rane Corp.
Made in U.S.A.
87
6
5
4
3
2
10
F E D C B A
9
SysName Switches
On the rear panel are four rotary switches that are used to create
a four digit identifier that becomes part of the SNMP variable,
sysName. sysName is then used to uniquely identify a CobraNet
device on the network. The condition of being unique requires
that each device on the network have a different setting. Looking
at the unit with the switches facing you, as in the above diagram,
the identifier reads from left to right.
Thus, setting the switches to 1, A, 3, 7, respectively, sets the
sysname variable to “NM1-Sw1A37.”
Mounting
The NM 1 is equipped with mounting ears to solidly attach it to
a surface if needed. Rubber feet are also included for tabletops.
SNMP
If you are new to SNMP or would like an easy overview, see the
RaneNote "SNMP: Simple? Network Management Protocol at
www.rane.com/note161.html
.
Software
Refer to the NM 1 Data Sheet for software information.
Summary of Contents for NM 1
Page 1: ...NM 1 NETWORK MIC PREAMP...
