NCS -C250C Instruction Manual page 10

7.1.2
Programming the microphone connectors is accomplished by setting the microphone
connector pin functions, selecting the impedance level and connecting a voltage
supply pin if using an electret microphone element
The diagram below shows the Microphone Setup Area of the main circuit board.
Refer to it for the following steps.
To program the functions of the pins on the microphone connectors, use the shunts
supplied in the accessory kit to jumper the appropriate microphone pin numbers to
the corresponding signals on the MIC CONN PIN jumper blocks.
For example, to program the microphone shown in the following chart, install the PIN
SELECT shunts as shown. NOTE: These shunts are shown in the factory default
positions.
NCS-C250C Instruction Manual Rev J
Programming the Microphone Connectors
.
Microphone Setup Area
Default Microphone Pin-out
MIC Shunt
Signal Name
Pin Row
------
Pin 1
------
Pin 2
------
Pin 3
J2
Pin 4 MIC Audio
J4
Pin 5
J3
Pin 6
------
Pin 7
------
Pin 8
Copyright © 2004-2010 New Communications Solutions, LLC
10
Mic Impedance and
Attenuation Jumper
Electret Voltage Jumper
N/C
N/C
N/C
GND
PTT
N/C
N/C