RF Neulink NL5000-T - Manual (Page 11)

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present. Input levels are TTL/CMOS; polarity may be programmed. Internal 10
kΩ pull-up to +5 volts.
12 AUDIO OUT-This is the output of the audio power amplifier. This output can
drive up to ½ watt in to an 8 ohm load. This output can be enabled and its gain
controlled by programming.
13 DCD-Carrier detect output. This output becomes true when a signal strong
enough to exceed the programmed squelch threshold is present. This output is
not affected by the RX MON input. The polarity can be programmed. The
output is active low 5 volt logic with an internal 10 kΩ pull-up to +5 volts. It
can source up to 10 mA when low.
14 PTT/RTS-Push to Talk/Request to Send. This input commands the unit to
transmit. Input levels are TTL/CMOS; polarity may be programmed. Internal
10 kΩ pull-up to +5 volts.
15 GND-System ground. All signals and voltages are referenced to this input. The
negative side of the power supply should connect here.