RF Neulink NL5000-T - Manual (Page 10)

10
3 CS2-Most significant bit of the channel select lines. Active high 5 volt
TTL/CMOS level. Internal 10 kΩ pull-up to +5 volts.
Channel CS2 CS1 CS0
1 0 0 0
2 0 0 1
3 0 1 0
4 0 1 1
5 1 0 0
6 1 0 1
7 1 1 0
8 1 1 1
0 = Logic low
1 = Logic high
Note: Due to the internal pull-up resistors, the unit defaults to channel 8 if the
channel pins are left open (unconnected).
4 MIC IN-Microphone input. This input accepts microphone type input signals
for transmit. The signal is amplified, passed through the clipper and the clipper
filter and then to the RF board. This input can be programmed to be disabled
(muted) if desired.
5 CSN-When enabled through programming, this input selects between channels 1
and 2. This input is TTL/CMOS level type input with a logic low required for
channel 1 and a logic high required for channel 2. Internal 10 kΩ pull-up to +5
volts.
6 RAW SUPPLY- The positive supply voltage for the unit is supplied through this
pin. The actual supply voltage required depends upon model type. Ensure that
the correct supply voltage per the given model is used.
7 AUX IN-This is the broadband input for modulation. The gain through this
input to the modulator is programmable, as is the use of pre-emphasis. This
signal passes the clipper and clipper filter.
8 AUX OUT-This is the broadband output of the receiver. The gain from the
receiver to the output is programmable, as is the use of de-emphasis. The choice
of AC or DC coupling from the RF board discriminator is also programmable.
The coupling at the output of this pin is AC coupled, however. It can be
converted to DC coupling with internal hardware modifications.
9 PGN IN/OUT-Connect via RF Neulink NL5000T-PCPK PC Programming Kit
to computer for programming the unit.
10 CTS-Clear-To-Send output from the unit which indicates that the unit is
transmitting a carrier at the correct frequency and power level and is ready to
accept an input signal to be transmitted. This output would normally become
true in response to a PTT RTS (see pin 14 description below) activation. The
polarity of this output can be programmed. The output is active low 5 volt logic
with an internal 10 k ohm pull-up to 5 volts. It can source up to 10 mA when
low.
11 RX MON-This input breaks the squelch on the receiver i.e. allows for
monitoring the channel even when a signal not strong enough to break squelch is