From left to right the connectors are:
Coupler 1 input
Coupler 2 input
Power Monitor Alarm Connection (1/8” phone jack)
2.1 mm coaxial DC input connector (12 to 15 V DC @ 500 mA typ.)
PTT In (From your radio)
PTT Out (To your amplifier)
RS232* You may use this if you have an RS232 connector on your computer
USB* USB Mini B connector to connect to a USB port on your computer
*Note: You may not use both the RS232 and USB connections at the same time. Only connect one to your computer. The RS-232 port is
disabled by the firmware when the USB port is active.
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