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MAIN PCB
+12V
RED
(V1)
D1
0V
BLACK
D2
SeaTalk
DATA
YELLOW
SeaTalk
CABLE
RESET
W'DOG
R-C TIMING
COMPONENTS
12V
12V HELD
REF
PL2
1
0V
0V
2
8V
8V
3
NC
4
ANEMOMETER
OUTPUT
PL1
1
8V
8V
2
SINE
3
COSINE
4
0V
0V
ROUND PCBS
PL1
0V
8V
R2
SINE
O/P
IC3
COSINE
R1
ANEMOMETER
Figure 3 Block Diagram
Signal flow is left to right except where indicated
16 ST80 Active Wind Service Procedures 83067-1
D3
D4
REGULATOR
D5
SeaTalk DATA IN
P3.1
SeaTalk DATA OUT
P3.0
RESET
RST
IC5
W'DOG
P1.4
POWER FAIL
P3.5
ASIC
SCL
P1.1
IC6
SDA
P3.3
EEPROM
XTAL
XL1
12MHz
CRYSTAL
+
a
P3.2
IC3
+
VTEST
d
P3.4
+
SINE
b
P1.5
+
COSINE
c
P1.0
COMPARATORS
MICROPROCESSOR
PL1
8V
IC1
IC2
0V
WIND VANE
ST80 Active Wind Transducer
IC1
12V
0V
REGULATOR
12V
0V
REGULATOR
(ALTERNATIVE FIT)
REF TO IC3a, IC3d
+5V
R8
+
IC7
OUT1
R9
IC4b
OUT2
0V
(MSB) BIT1
P3.7
BIT2
P3.6
BIT3
P2.7
BIT4
P2.6
BIT5
P2.5
BIT6
P2.4
BIT7
P2.3
BIT8
P2.2
BIT9
P2.1
(LSB) BIT10
P2.0
D/A CONVERTOR
SeaTalk BUS
PL1
PL2
RED
BLACK YELLOW
+12V
0V
SOLDERED CONNECTIONS
IC3
ANEMOMETER
MAIN PCB
PCB INTERCONNECTION
12V
12V HELD
D6
+5V
0V
IC2
+8V
(IC9)
IC8
+
VREF
0V
R11
IC4a
R10
PL1
PL1
SeaTalk
IC1
IC2
WIND VANE
D2713-1
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