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5 Allocation of Buffer Memories
5.22 [BFM #3000 to #3879] Configuration of Remote Address to ECU Name Assignment
46
FX
3U
-J1939 User's Manual
5.22
[BFM #3000 to #3879] Configuration of Remote Address to ECU Name
Assignment
When the remote nodes of a J1939 network support dynamic address allocation, it is possible that a remote
node changes its current node address due to an address conflict. Additionally, a configuration tool could
send a "commanded address" message, which would also cause the remote node to change its address.
This could cause a problem if the source/destination node address, configured in the FX
3U
-J1939, is not used
by the expected node anymore.
To avoid this, the FX
3U
-J1939 supports the following table where the remote source/destination node address
used in the FX
3U
-J1939 configuration can be assigned to the unique ECU name of the Remote node.
If the FX
3U
-J1939 receives an address claim message from one of the ECUs listed in this ECU Name list, it
checks if the node address has changed. The FX
3U
-J1939 will adjust its internal configuration to ensure that
communication will not fail after an address change (the destination address of TX PGNs or the source
Address of RX PGNs is adjusted).
For the Industry Group, Vehicle System, Vehicle System Instance, Function, Function Instance,
ECU instance, Manufacturer Code and Identity Number, refer to Section 5.17
e.g.
• The FX
3U
-J1939 is configured to exchange PGN 45312 with node 130.
(ECU name HD0FE.FF00.FFFF.FFFF).
• Node address 130 is claimed by a different ECU.
• ECU (ECU name HD0FE.FF00.FFFF.FFFF) claims node address 131.
• Now the FX
3U
-J1939 checks the Table in BFM #3000 to #3879.
(Where ECU name HD0FE.FF00.FFFF.FFFF is assigned to node address 130)
• The FX
3U
-J1939 adjusts the configuration to ensure PGN 45312 is from now on exchanged with node 131.
Note
If not using the remote node address to ECU name assignment, set K-1 to Node address.
BFM No.
Description
Bit Length
Default Value
Remote ECU
BFM #3000
Node address
*1
8 bit
K-1 (Not used)
1st remote node address to
ECU name assignment
BFM #3001
Arbitrary address capable field
1 bit
K0
BFM #3002
Industry Group
3 bit
K0
BFM #3003
Vehicle System
7 bit
K0
BFM #3004
Vehicle System Instance
4 bit
K0
BFM #3005
Function
8 bit
K0
BFM #3006
Function Instance
5 bit
K0
BFM #3007
ECU instance
3 bit
K0
BFM #3008
Manufacturer Code
11 bit
K0
BFM #3009
Identity Number (LW)
21 bit
K0
BFM #3010
Identity Number (HW)
K0
BFM #3011
Node address
*1
8 bit
K-1 (Not used)
2nd remote node address to
ECU name assignment
BFM #3012
Arbitrary address capable field
1 bit
K0
BFM #3013
Industry Group
3 bit
K0
BFM #3014
Vehicle System
7 bit
K0
BFM #3015
Vehicle System Instance
4 bit
K0
BFM #3016
Function
8 bit
K0
BFM #3017
Function Instance
5 bit
K0
BFM #3018
ECU instance
3 bit
K0
BFM #3019
Manufacturer Code
11 bit
K0
BFM #3020
Identity Number (LW)
21 bit
K0
BFM #3021
Identity Number (HW)
K0
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