VXR-9000 UHF Service Manual
DSUB 25-pin Accessory Connector
B-2
Pin 10, 13, 15, 16, 17, 18, 19, 21:
PROGRAMMABLE I/O “1” ~ ”8”
The VXR-9000 provides eight ports (PIO)
that can be programmed for various in-
put or output signals, or for control func-
tions. Each port may be programmed as
to its function, its status (input or output),
and its logic (for output ports only). See
Tables on the next page for detail regard-
ing the input and output signals.
Pin 11: NSQ DET
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 indi-
cates a carrier on the receiver channel.
Pin 12: EXT PTT
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 dam-
age to the microprocessor on the repeater CNTL Unit may
result.
Pin 14, 20: GND
Chassis ground for all logic levels and power supply re-
turn.
Pin 22: RXD LOW
[
A
NALOG OUTPUT FOR DATA COMMUNICATIONS
]
(
300 ~ 3,000 Hz
)
This pin is an output for low speed receiving data signals
(typically 1200 bps), with the data being extracted after
the de-emphasis and low pass filter stages.
Pin 23: RXD HIGH
[
D
IGITAL OUTPUT FOR DATA COMMUNICATIONS
]
(
Max.: 5 kHz
)
This pin is an output for high speed receiving data sig-
nals (typically 9600 bps), with the data being extracted
immediately after the discriminator (prior to any de-em-
phasis).
Pin 24: TXD LOW
[
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 (typically 1200 bps). This digital data
signal is injected before the transmitter pre-emphasis and
limiting stages, so excess signal input levels are clipped.
Pin 25: TXD HIGH
[
DIGITAL INPUT FOR THE DATA COMMUNICATIONS
]
(
0 ~ 5 kHz
)
This pin is intended to be used as a high speed digital
data signal input to the repeater (typically 9600 bps). This
digital data signal is injected after the transmitter splatter
filter stage.
CHANNEL STEERING CHART
OPERATING
CHANNEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
Bin CH
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
OPERATING
CHANNEL
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
Bin CH
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Pin I/O Port
10 7
13 8
15 5
16 4
17 3
18 2
19 1
21 6
To Next Page
Loading...
Need help?
General
