J1939 Interface; Address Management - HMS Anybus X-gateway User Manual

J1939 to modbus interface

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Chapter 6

The JMI address management is responsible for bringing the module online on the

J1939 network with a unique network address in accordance to the J1939-81 spec-

ification. The address management will claim a configured address, if possible,

and protect it against lower priority contending address claims. If a configured

address is unable to be uniquely claimed, or is lost due to a higher priority con-

tending claim, the module will be taken offline.

This manual will not discuss the address management protocol in detail; readers

should reference the J1939-81 specification for complete details. The scope of this

section is to explain how the configuration of the address list affects address man-

agement.

Single Configured Address

If a single address is configured in the address list, the module will attempt to

claim that address. If the configured address is successfully claimed, the module

will join the J1939 network using that address. If the address cannot be claimed,

the module remains offline.

Multiple Configured Addresses

If more than one address is configured in the address list, the module will attempt

to claim addresses in the order they appear in the list until it is either successful, or

it runs out of addresses. Once an address is successfully claimed, the module will

join the J1939 network using that address. If an address cannot be claimed, the

module moves to the next address in the list and attempts to claim that address. If

no addresses in the list can be claimed, the module remains offline.

J1939 Interface

J1939 Interface 6-1

Doc.Id. HMSI-168-25

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