Chapter 1: St40 Speed Instrument; Input/Output Signals; Self-Testing - Raymarine ST40 Service Manual

Chapter 1, ST40 Speed Instrument
Chapter 1:

Input/output signals

Self-testing

ST40 Instruments Service Manual 83149-2
ST40 Speed Instrument
STALK (Yellow)
BATT- (Screen)
BATT+ (Red)
Connections to ST40 Speed instrument
Signal Description
STALK Intermittent streams of (nominal) 12 V pulses
BATT- 0 V
BATT+ Nominal 12 V dc supply
12V Approximately 11.2 V dc out
SPD With transducer attached, spinning paddle-wheel produces pulses
approximately 11.2 V in amplitude @ 5.5 Hz/Knot.
SCREEN 0 V
TEMP With transducer attached, voltage here is dependent on
temperature. Approximately 1.8 V at 0 degrees C.
OVANA 0 V
Refer also to the ST40 Speed circuit diagram.
Each ST40 instrument has built-in self-test functions to aid fault diagnosis.
To self-test an ST40 Speed instrument:
• Press the and keys simultaneously for 4 seconds, to access self-test mode,
then within 2 seconds, press the
self-test stage 1.
Raymarine
Limited
and keys together momentarily, to start
12V (Red)
SPD (Green)
SCREEN (Screen)
TEMP (White)
0VANA (Brown)
D4804-2
2-1