DB-15 Pin Interface Connector
The table on the following pages indicates the DB-15 Pin descriptions with input and
output levels.
Pin No.
Function
Description
Signal Type
I/O
1
Link option
default
Data modulation IN.
(used with an external
modem)
AC coupled signal directly injected
to MOD through data low pass
fi
lter
without pre-emphasis.
Analogue Input signal
1KHz audio at 60% peak
dev. input level =
100 to 120mVrms
I/P
1
Link option
DC data
modulation In
DC coupled direct FM signal
without
fi
ltering (POCSAG)
Analogue Input signal
1.9V dc offset
450~550mV @60% dev
I/P
1
Program
option
TTL input
(POCSAG)
DC coupled direct signal designed
to work with TTL signals. Frequency
and Deviation
adjustable to application
TTL Levels
I/P
1
Program
Opt & H/W
changes
AC coupled direct FM
modulation
AC coupled direct FM signal,
without
fi
ltering.
Program to TTL
Analogue Input singnal
350mV @ 60% dev
adjustable
I/P
1
Link option
DC data modulation
Input
DC coupled direct FM signal,
without
fi
ltering
1.9V dc offset
450~550mV @60% dev
I/P
2
Un
fi
ltered Data OUT
(RX disc)
Discriminator Audio, unprocessed
AF signal(prior to tone
fi
ltering and
de-emphasis
Output signal
1KHz audio at 60% peak
dev. produces
200 to 300mVrms
O/P
3
PTT In
(Tx Key)
Signal, which keys the transmitter,
when operating as a dumb radio.
Note: If the option module is installed,
RS232 levels must be selected on
CON407. See Module manual.
TTL level
0V = TX, open cct = RX
RS232 level (option)
+12V = Tx, -12V = Rx
I/P
4
Ground
Ground connection
0V (Chassis)
5
Program Data Out/
Serial Data Output
Programming data output / Serial
data output.
TTL level
(programming cable has
RS232 converter)
O/P
6
Busy
(CD)
Logic level output to indicate
presence of a carrier.
Note: If the option modem is installed,
RS232 levels should be selected on
CON407. See Module manual.
TTL level
0V = carrier,
5V = no carrier
RS232 level (option)
+12V = carrier
-12V = no carrier
O/P
7
default
Audio IN
(Mic) / Monitor
Audio signal that is
fi
ltered (high pass
and pre- emph) then follows same
route as data mod through LPF.
Mic activated by being at 0V (also 0V
activates monitor). 5V default (pull up
resistor), assumes data input when
PTT is active.
1KHz audio at 60% peak
system deviation
input level = 6 to 8mV
rms(AC coupled)
I/P
DATA MOD IN
1
2
3
4
5
6
7
8
9
10
Data OUT (AF)
PTT IN
GND
SERIAL OUT (PROG.)
BUSY
MIC IN (AF)
SERIAL IN (PROG.)
SPK OUT
RS232 DATA (OPT)
11
12
13
14
15
RS232 DATA OUT (OPT)
SERIAL BUSY OUT (OPT)
GPS DATA IN (OPT)
+VE IN /
GPS DATA OUT (OPT)
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