J1939 Interface 6-2
© 2012 HMS Industrial Networks AB
Doc.Id. HMSI-168-25
Address Loss
If the module loses its current network address to a higher priority contending
address claim, it will cease all network activity using that address. If the address
list is configured with a single address, the module will remain offline after an
address loss. If the address list has multiple addresses, the module will attempt to
claim the next address on the list. If no addresses in the list can be successfully
claimed, the module will remain offline.
Invalid Addresses
If the address configured is invalid (outside of the range 0-253), the module will
remain offline and not attempt an address claim.
Request for Address Claimed
The JMI will respond to a Request for the Address Claimed PGN (0x00EE00)
sent both destination specific and broadcast. The response is dependent on the
current address management state, and is discussed below.
•
If the module has successfully claimed an address and is online, the
response will be an Address Claimed message with the current address.
•
If the module is offline because it has lost its address to a higher priority
claim and cannot successfully claim another address, the response will be
a Cannot Claim Address message.
•
If the module is in the process of attempting to claim an address, it will
not respond to the request.
•
If the module is offline because it has not yet attempted to claim an
address, or the configured address is invalid, it will not respond to the
request.
Communications Methods
The J1939 network interface supports reception and transmission of the following
J1939 message types in accordance to the J1939-21 specification.
•PDU1 destination specific
•PDU1 broadcast
•PDU2 (broadcast)
