User's Manual

12
6888882V04
D
MIC AUDIO
Input audio signals generated by the microphone (600 
impedance; 6 mV tone is required for full output power)
E
AUDIO OUT
Receive audio output to external speaker
F
SWA+
Supply voltage output to microphone (13.8 VDC nominal)
Data Connector
The data connector is a circular 3-pin connector located on the rear panel. This connector is used
to connect external equipment (for example, a PC running MicomNet) to the internal modem.
When your unit supports encryption, the connector is also used to load encryption keys from a
PC running the MKL key loader software.
The following table lists the functions of the data connector pins.
Connector View
Pin
Designation
Description
Red Mark
1
3
2
1
RXD
Data receive input (RS-232 levels) for connection
to the transmit output (TXD) of external
equipment
2
TXD
Data transmit output (RS-232 levels) for connection to
the receive input (RXD) of external equipment
3
GND
Ground
Headphone Jack
The headphone jack is a standard 1/4” audio jack.
Telegraphy (Morse) Jack
The telegraphy (Morse) jack is a standard 5.3 mm audio jack.