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Modbus Interface 4-5
© 2012 HMS Industrial Networks AB
Doc.Id. HMSI-168-25
Modbus Diagnostic Register
The Modbus diagnostic register is a bit string that indicates the current status of
the Modbus network interface and any faults that may have occurred.
J1939 Status Register
The J1939 status register is an enumerated value that indicates the current status
of the J1939 interface.
Bit
Description
0
The JMI has been initialized and is active in network activities.
1
The connection with the Modbus master is active.
2
The JMI is in Run mode. (The bit cleared indicates Idle mode)
3
A serial communication receive overrun error has been detected.
4
A serial communication parity error has been detected.
5
A serial communication framing error has been detected.
6
A CRC error on a Modbus message has been detected.
7-15 Not used.
Table 4-4 Modbus Diagnostic Register Bit Definitions
Value
Description
0
The JMI is offline. It is not participating in any J1939 network activ-
ity.
1
The JMI is online and is actively participating in J1939 network activ-
ity.
2
The J1939 network interface is initializing and has not yet joined the
network.
Table 4-5 J1939 Status Register Values