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

1.3 PCB Details

4 ST4000+ Autopilots Service Manual 83115-1

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

Pin No. Signal
PL1/1 +12V
PL1/2 0V in
PL1/3 SeaTalk
PL2/1 +12V
PL2/2 0V in
PL2/3 SeaTalk
P1 +12V
P2 0V in
P3 SCRN
P4 Bias
P5 F/GA
P6 F/GB
P7 Coil drive
P8 Rudder reference
supply
P9 Rudder reference
P10 Rudder reference 0V
P11 SCRN
C+ Clutch
C– Clutch 0V
MD1 MD1
MD2 MD2
NMEA in+ NMEA+
NMEA in– 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