Pcb Details; Input/Output Signals (Refer To Figure 2. Circuit Diagram) - AUTOHELM ST4000+ Service Manual

1.3 PCB Details

Input/Output Signals (refer to Figure 2. Circuit Diagram)

Pin No.
PL1/1
PL1/2
PL1/3
PL2/1
PL2/2
PL2/3
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
C+
C–
MD1
MD2
NMEA in+
NMEA in–
4 ST4000+ Autopilots Service Manual 83115-1
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Signal
+12V
0V in
SeaTalk
+12V
0V in
SeaTalk
+12V
0V in
SCRN
Bias
F/GA
F/GB
Coil drive
Rudder reference
supply
Rudder reference
Rudder reference 0V
SCRN
Clutch
Clutch 0V
MD1
MD2
NMEA+
NMEA–
ST4000+ Autopilots
Description
Nominal 12V dc
0V
Intermittent streams of (nominal) 12V pulses
Nominal 12V dc
0V
Intermittent streams of (nominal) 12V pulses
Nominal 12V dc
0V
0V
Nominal 2.5V dc (VRESET)
+2.5V dc
+2.5V dc
AC signal, 17 cycles at 7.9kHz, driven twice
every 1/16 second
Nominal 5V supply to rudder reference
0 to 5V dc (nominal) rudder reference output
0V
0V
+12V if Autopilot engaged; otherwise 0V
0V
When Autopilot engaged and depending on
direction of drive, intermittent variable length
pulses, nominal 12V; otherwise 0V
When Autopilot engaged and depending on
direction of drive, intermittent variable length
pulses, nominal 12V; otherwise 0V
Intermittent streams of (nominal) 12V pulses
0V