GW-7228 Quick Start v1.2 2011/05
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J1939 I/O Configuration
The following figure is a PGN definition about Electronic Transmission
Controller, we want to receive the Transmission Output Shaft Speed from the
transmission and send the Transmission Input Shaft Speed to the transmission via
the GW-7228. The following table shows the current planning.
Figure 8: Example of a parameter group definition of SAE J1939/71
Table 1: Configuration data of J1939 and Modbus
Parameters
PGN
Data
Length
(bytes)
Byte Order
In J1939
Data Field
Byte Order
in
MODBUS
MODBUS
Address
Send
Input Shaft
Speed
61442(Dec)
F002(Hex)
2
5
0
40001
Receive
Output Shaft
Speed
61442(Dec)
F002(Hex)
2
1
0
30001
Note:PGN/Data Length(Bytes)/Byte Oder in J1939 Data Field
=> Transmission manufacturers provide the information required
Byte Order in MODBUS
=> User-defined Modbus address
