Simrad SP270 Installationshandbuch Seite 82

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Simrad SP270
38
851-160572 / B
1 Locate the 9-pin D-connector, the connector housing and
the shrink tube in the spare parts box, and make the
plug-connections. The cable screen should be connected to
the connector housing.
2 Locate the DIL switch S1 on the Control Unit Board (refer
to figure 20), and set the switches according to the table
below.
Gyro
DILswitchS1
1 2 3 4 5 6 7 8
100 pulse per nautical mile Off Off On Off Off Off Off Off
200 pulse per nautical mile Off Off Off On Off Off Off Off
400 pulse per nautical mile Off Off On On Off Off Off Off
3 Do not insert the Control drawer unit before mentioned in
a later chapter.
Figure 24 shows the pulse log interface circuit on the Control
Unit Board.
PULSEREF
9
6
3
1N4148
D11
(CD1875)
100k
100k
10k
100k
10k
+12V
R39
R41
4
5
IN-
IN+
12
2
3
U87
R78
1k
TP5
+12V
+5V
LM339
R42
R40
R45
PULSE+
PULSE-
Figure 24 Pulse log interface
When the system is started up, an oscilloscope can be connected
to the test point TP5 to check if the pulse log signal is coming
through the comparator U45 (TP4 is GND). If the signal is not
coming through the comparator, try to adjust the 10-turn
potmeter R45. In case of noise problems, R45 can be adjusted
for noise limitation.
Connecting a speed log with serial line output
The Sonar Control Unit can read the speed log data (and/or the
course gyro data) from a serial line with on of the following
outputs (tick off for the type which will be connected):
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