4
1: Installation
The Crescent A100 uses pin 12 for the speed out pin. Pin 12 will output a
square wave with a 50% duty cycle. The frequency of the square wave
varies directly with speed. 94 Hz represents a speed of 1 meter per
second, or a 28.65 pulse per foot traveled.
CAN
The Crescent A100 features Controller Area Network (CAN) to handle
communication between CAN-based devices.
The Crescent A100 supports a selection of NMEA 2000 messages that
can be broadcast on a CAN bus. Table 1-1 provides a listing of the
NMEA 2000 commands that are used.
Note:
Pin 12 does not have any form of isolation or surge
protection. You are STRONGLY encouraged to incorporate
some form of isolation circuitry into your supporting hardware if
you wish to utilize the Speed Radar Pulse output.
Table 3-1: NMEA 2000 commands
PGN 129029
GNSSPositionData
PGN 129025
GNSSPositionRapidupdate
PGN 129026
NMEACogSogData
875-0163-000 (Crescent A100).book Page 4 Tuesday, November 13, 2007 11:29 AM
Summary of Contents for Crescent A100
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