Parker Hannifin Corporation
– GS100 User Manual
17
Data field structure
The Data Field is structured as Little Endian within the bytes, and Big Endian for the Data Field.
DATA FIELD
BYTE 1
BYTE 2
BYTE 3-7
BYTE 8
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6
…
1 0 7 6 5 4 3 2 1 0
Table 7.4:1 Data Field Structure
Communication Message Types
The GS100 uses two communication message types: Global and Specific Address.
Global Message:
This is the operational “Broadcast mode” message for all the axis tilt information
and pitch and roll information on the sensor. In these messages the unit broadcasts the outgoing
data on the J1939 at 50 ms intervals.
Specific Address Message:
This is the “Command mode” message for the sensor. In these
messages the GS100 receives write and query messages to its node address from the J1939 bus.
Ensure there is no loss of power while making programming changes with the GS100 in service
mode
Adjustable User Parameters
The sensor has ability to change parameters over CAN that can be used to tune the sensor in different
application scenarios. More detailed information and example usages are discussed in following
chapters.
•
Broadcast Message PGN (Default is FF75)
•
Number of Samples taken to calculate Speed (can choose between 1-15 but the default is 8
samples)
•
Message Data Rate (It can be varied from 10 ms to 2000 ms, default is 50ms)
•
Source Address (Default is 0x80)
•
CAN Baud Rate (125 kbps, 250 kbps, 500 kbps, and 1000 kbps. Default is 250kbps)
The following Tables will describe the CAN message information in detail and some application CAN
examples are provided at the end.
