Vertex Standard VXR-9000E Operating Manual page 10

DB-25 Connector Port
p 10, 13, 15, 16, 17, 18, 19, 21:
in
Programmable I/O "1" ~ "8"
The VXR-9000E provides eight ports
(PIO) that can be programmed for
various input or output signals, or
for control functions. Each port may
be programmed as to its function, its
status (input or output), and its logic
(for output ports only).
p 11: NSQ DET
in
This is an open-collector, active-low output capable
of sinking about 10 mA. It indicates that the receiver
squelch is open. If the squelch control is properly set,
this indicates a carrier on the receiver channel.
12: EXT PTT
p
in
This input is internally pulled up to 5 VDC. When
pulled low by an external device, it keys the repeater
transmitter while the repeater is operating in the
"Remote" mode. Avoid voltage in excess of 5 V on
this pin, or internal damage to the microprocessor
on the repeater CNTL Unit may result.
14, 20: GND
p
in
Chassis ground for all logic levels and power supply
return.
8
p 22: RXD LOW
in
[ Analog Output for DATA Communications ] ( 300 ~ 3,000 Hz )
Pin I/O Port
This pin is an output for low speed receiving data
10 7
13 8 signals, with the data being extracted after the de-
15 5
emphasis and low pass filter stages.
16 4
17 3
23: RXD HIGH
p
in
18 2
[ Digital Output for DATA Communications ]
19 1
21 6 This pin is an output for high speed receiving data
signals, with the data being extracted immediately
after the discriminator (prior to any de-emphasis).
24: TXD LOW
p
in
[ Analog Input for DATA Communications ] ( 300 ~ 3,000 Hz )
This pin is intended to be used as a low speed data
signal input to the repeater. This digital data signal
is injected before the transmitter pre-emphasis and
limiting stages, so excess signal input levels are
clipped.
p 25: TXD HIGH
in
[ Digital Input for the DATA Communications ]
This pin is intended to be used as a high speed digi-
tal data signal input to the repeater. This digital data
signal is injected after the transmitter splatter filter
stage.
VXR-9000E FM R O
EpEatER pERating
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anual