14
(Tx Key)
SD-160 transmitter.
This line has an internal pull up resistor to
+5V. Pulling the line to 0V turns on the
transmitter.
Note : If you installed option modem
board, you can select RS-232 signal level
by Jumper (CON407) on the digital
board.
0V = Tx
o/c = Rx
RS-232 level (option)
+12V = Tx
-12V = Rx
4
Ground
Ground connection to chassis of the radio.
0V (Chassis)
5
Serial Data Out
(TXD)
Serial data output for radio control or
program.
It uses asynchronous data format.
TTL level
O/P
6 Busy
(CD)
Logic level output from the SD-160 to
indicate whether a carrier is present or not
Note : If you installed an option modem
board, you can select RS-232 signal level
by Jumper (CON407, ) on the digital
board.
TTL level
0V = carrier
5V = no carrier
RS-232 level (option)
+12V = carrier
-12V = no carrier
O/P
7 Microphone
filtered
audio IN
This signal is injected to the MOD at the
point through audio-amplification, pre-
emphasis and high pass filtering where sub-
audio tone is mixed with audio.
Audio
1KHz audio at 60%
peak system deviation
input level =
6 to 8Vrms
I/P
8
Serial data IN
(RXD)
Serial command or data input for radio
control or program. It uses asynchronous
data format.
TTL level
I/P
9
Speaker filtered OUT Audio output from the audio amplifier.
It’s filtered by tone-filter, de-emphasis
circuit.
Audio
1KHz audio at 60%
peak system deviation
produces Nominal
1Vrms @ 8
Ω
O/P
10
Serial data IN for
option modem
The Serial data to be transmitted is input to
this pin. It’s only available when option
modem board is installed. Inputted data are
modulated by modem IC and then injected
to MOD.
It uses asynchronous data format.
RS-232 level
I/P
11
Serial data Out for
option modem
The recovered asynchronous serial data
output from the receiver. It’s only available
when option modem board is installed. It
uses asynchronous data format.
RS-232 level
O/P
12
Serial data busy for
option modem
(reserved)
To eliminate data loss according to buffer
overrun of slave MCU’s memory, it indicates
buffer status.
RS-232 level
O/P
13
GPS data input
Data input for initial setting of GPS module.
It follows NMEA 0183 format and uses
asynchronous data format.
TTL level
I/P
14
DGPS data input
Data input for DGPS Correction of GPS
module. It follows NMEA 0183 format and
uses asynchronous data format.
TTL level
I/P
15
GPS data output
Position data output from the GPS module.
It follows NMEA 0183 format and uses
asynchronous data format.
TTL level
O/P
Table 5.1. Pin Description for DB-15 female connector of SD-160
