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Configuration 3-10
© 2012 HMS Industrial Networks AB
Doc.Id. HMSI-168-25
J1939 I/O Configuration
The J1939 I/O configuration is used define the content and format of the I/O table.
Data from J1939 messages that are to be monitoring or transmitted are mapped to
locations within the Input or Output tables respectively.
Inputs Versus Outputs
The Input table holds data that is collected from the J1939 network and can be
read by the Modbus master. Input data points are associated with data from mes-
sages that are received on the J1939 network.
The Output table holds data that is written by the Modbus master and will be
transmitted on the J1939 network. Output data points are associated with data of
messages that will be transmitted on the J1939 network.
I/O Configuration Limits
The I/O configuration is limited as follows:
2048 bytes maximum in the Input table
2048 bytes maximum in the Output table
200 total data points in the configuration. This is the combined number of
input and ouput data points.
Up to 120 different PGN’s may be monitored by input data points
Up to 100 different PGN’s may be transmitted by output data points