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FX
-J1939 User's Manual
3U
7.2.1
Pre-defined Layer 2 transmit messages
This subsection describes parameters A to D for the transmit message.
Parameter
Layer 2 message number parameter A
Layer 2 message number parameter B
Layer 2 message number parameter C
Layer 2 message number parameter D
1. Parameter A and B for each Layer 2 message
A message buffer in BFM #100 to #393 is assigned to a Layer 2 transmit message by writing HFFFF in
parameter A, and writing H7FFF, H6FFF or H5FFF in parameter B.
For unused Layer 2 messages, set parameter A and B to HFFFF.
Note
The Layer 2 implementation of the FX
(parameter B = H7FFF or H6FFF). If the configuration violates this rule, the first 28 transmit message
configurations remain as they are, and RTR handling is disabled for any further transmit messages as
parameter B is forced to H5FFF.
• When using the auto RTR response
Set H7FFF to parameter B for the Layer 2 message.
The FX
-J1939 automatically responds to Remote Transmit Requests (RTRs) if the 11/29 bit CAN-ID
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(e.g. setting in BFM #100 and #101) matches the ID in the RTR message.
Reception of the RTR message is not displayed in the Layer 2 RTR Flags.
• When using the manual RTR response
Set H6FFF to parameter B for the Layer 2 message.
The FX
-J1939 will not automatically respond to Remote Transmit Requests, but the reception of the
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RTR message is displayed by the Layer 2 RTR Flag.
• When using the disable RTR handling
Set H5FFF to parameter B for the Layer 2 message.
The FX
-J1939 will discard any incoming RTR telegrams matching the CAN-ID of this Layer 2 message.
3U
7.2 [BFM #1100 to #1267] Pre-defined Layer 2 Messages Parameter
Description
Constant HFFFF
H7FFF (auto RTR response)
H6FFF (manual RTR response)
H5FFF (disable RTR handling)
HFFFF (message disabled)
Transmission type
Cycle time in [10 ms]
-J1939 can handle up to 28 transmit messages with RTR handling
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For Layer 2 RTR flags, refer to Section 7.3
For Layer 2 RTR flags, refer to Section 7.3
For Layer 2 RTR flags, refer to Section 7.3
7 Layer 2 Communication Mode (11/29 bit ID)
Default Value
HFFFF
HFFFF
H0000
H0000
1
2
3
4
5
6
7
8
9
10
65
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