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Parameter Groups contain information on parameter assignments
within the 8 byte CAN data field of each message as well as repetition rate
and priority.
The following is an example of a parameter group definition as listed in
SAE J1939/71:
Figure 4-1: Example of a parameter group definition of SAE J1939/71
4.2.3 Suspect Parameter Number (SPN)
A Suspect Parameter Number (SPN) is a number assigned by the
SAE to a specific parameter within a parameter group.
SPN that shares common characteristics are grouped into Parameter
Groups (PG) and they will be transmitted throughout the network using the
Parameter Group Number (PGN).
To follow up on the previous example (PGN 65262), the parameter
Engine Coolant Temperature is described by SPN 110 as following Figure:
GW-7228 J1939/Modbus RTU Slave Gateway User's Manual (Ver 1.3, Apr/2011) ------------- 33
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