Vertex Standard VXR-9000EV Service Manual page 4

DSUB 25-pin Accessory Connector
Pin 10, 13, 15, 16, 17, 18, 19, 21:
P I/O "0" ~ "7"
ROGRAMMABLE
The VXR-9000 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). Each port
activates while the repeater is operating
in the "Remote" mode. See Tables on the
next page for detail regarding the input and output sig-
nals.
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.
B-2
Pin 22: RXD LOW
[ A
NALOG
( 300 ~ 3,000 Hz )
Pin I/O Port
This pin is an output for low speed receiving data signals
10 6
(typically 1200 bps), with the data being extracted after
13 7
15 4 the de-emphasis and low pass filter stages.
16 3
17 2
Pin 23: RXD HIGH
18 1
[ D
IGITAL
19 0
( Max.: 5 kHz )
21 5
This pin is an output for high speed receiving data signals
(typically 9600 bps), with the data being extracted imme-
diately after the discriminator (prior to any de-emphasis).
Pin 24: TXD LOW
[ A
NALOG
( 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
[ D
IGITAL
( 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.
O DATA C
UTPUT FOR OMMUNICATIONS
O DATA C
UTPUT FOR OMMUNICATIONS
I DATA C
NPUT FOR OMMUNICATIONS
I DATA C
NPUT FOR THE OMMUNICATIONS
]
]
]
]