WSDA
®
-2000 User Manual
o
Broadcast Messages:
With this message format, the receiving system will need to be programmed to understand the
user defined payloads for each PGN sent. Specifically, the user will need to inform the receiving
system which order the data values are stored in the payload and how many bytes each data
value is made up of.
The destination will need to understand the LORD Sensing Wireless Sensor Networks Data
Communications Protocol for Low Duty Cycle (LDC), Synchronized Sampling, and Histogram
packets (
see Data Alias Definitions on page 29
). Since J1939 only supports payloads of 8 bytes,
sensor data packets will be broken up into multiple J1939 packets as required. In this scenario 7
bytes of sensor data packets are sent with a 1 byte J1939 sequence number to indicate its
position in the string of sensor data. This is done automatically and will appear seamless on the
receiving end.
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