6 J1939 Communication Mode
6.2 [BFM #500 to #973] Configuration Area
52
FX
3U
-J1939 User's Manual
- Overview Tx Message valid and invalid settings
*1.
Address HFE is an invalid address for all user messages.
- Additional notes for PDU1 format
If the same PDU1 PGN is configured with multiple destination addresses, the following cases need to be
taken into account:
a) Tx user messages can be either addressed to several explicit destination addresses OR to broadcast
the address HFF.
b) In general, a PDU1 PGN in a RX user message should use the FX
3U
-J1939 address (BFM #27) as
the destination.
e.g. BFM #27 = H80, PGN = HB100 >> filter PGN = HB180.
c) The Destination address of a RX user message can be set to a destination address other than BFM
#27. (The FX
3U
-J1939 is listening to a message targeting a different node.) As mentioned in the table
"Overview Rx Message valid and invalid settings" this setting is valid only for messages with max. 8
data bytes.
RX user messages can be addressed to both explicit destination addresses AND to broadcast
address HFF at the same time, as long as the DLC is 8 byte or less.
2. Priority
Set the priority of the message.
Setting range: K0 to K7 (where K0 is the highest priority)
For default priority of each PGN, refer to the related SAE J1939 Specification
Format
Destination
DLC
Mode
Description
PDU1
BFM #27
0 to 250
J1939
communication
Setting Invalid
HFF
Setting Valid (Transmit Broadcast messages)
Any other address
(not BFM #27, not HFF)
*1
Setting Valid
PDU2
-
0 to 250
Setting Valid
Direction
Configured User Messages
(all messages same DLC, e.g. all DLC = 8byte)
Description
TX
HB101, HB102, HB103
valid
Requests from node 1 to 3 will be answered. Requests
from any other node will result in a NAK message if PtP,
or a timeout if request was sent broadcast.
HB101, HB102, HB103, HB1FF
invalid
The broadcast message (HB1FF) will overwrite the data
written to node 1-3 (HB101 to HB103).
HB1FF (no other HB1xx message configured)
valid
Only broadcast requests are answered, PtP requests
will be answered by NAK.
RX
HB101, HB102, HB103, HB1FF
valid
Messages transporting the specified PGNs are stored,
any other (HB104 to HB1FD) are ignored.
The first 3 user messages will store the PGNs HB101 to
HB103 but no broadcast messages, while the last slot
stores only broadcast messages.
