User manual: Installation and Operation of Direction Finder System RHOTHETA RT-600 / SAR-DF 517
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5.2 Interface
External connections (optional / at Sub-D 9-pol. Connector X4 male)
Dimming:
Pin 8
external voltage input for
variable dimming of
legends.
(optional)
Analog input signal for variable control of the legends illumination.
Input voltage range is freely adjustable in the range of 1.5 … 28 V in the
setup menu. Refer to chapter “Setup Page”.
Default setting 8 …28 V. (8 V = Off, 28 V = max. dimming for legends)
Input Impedance: > 50 k
Ω
Pin 6
night status line for LCD
dimming (optional)
Low-active (as example switch to ground).
At input voltage < 2,5 V
DC
the LCD dimming operates in night/NVG
mode. Maximum brightness ca. 4% of day/default mode brightness.
Input Impedance: > 50 k
Ω
Pin 4
NVG status line for LCD
dimming (optional)
Low-active (as example switch to ground).
At input voltage < 2,5 V
DC
the LCD dimming operates in night/NVG
mode. Maximum brightness ca. 4% of day/default mode brightness.
Input Impedance: > 50 k
Ω
Audio/LF:
Pin 7
Audio output signal
AC coupled voltage source with very low inner resistance.
Maximum output voltage ca 8 V
PP
= 2,83V
RMS
at maximum Volume.
Maximum output power ca. 2 W with 4
Ω
speaker.
If a headphone is connected ([32…600]
Ω
/ 100mW), we recommend
using a resistor (18
Ω
/ 0.25 W) between audio output and headphone
to prevent damage of the headphone.
Serial interface RS232: (9600 baud, 8 data bits, 1 stop bit, no parity)
Pin 3
TXD
Serial output (ca. ±10 V)
Pin 2
RXD
Serial input (ca. ±10 V)
