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FX
-J1939 User's Manual
3U
BFM No.
BFM #387
BFM #388
BFM #389
BFM #390
BFM #391
BFM #392
BFM #393
BFM #394 to #399
*1.
For details, refer to "When transmitting messages" and "When receiving messages" mentioned shortly
hereafter.
*2.
These BFM will be stored into the Flash ROM when the save command is executed.
1. When transmitting messages
The CAN-ID, Status/Control Flags and data bytes of each message are as follows.
1) CAN-ID
The destination of the message is specified by the 32 bit CAN-ID parameter. Valid values are as follows:
- 11 bit mode: 0 to H000007FF
- 29 bit mode: 0 to H1FFFFFFF
2) Status/Control Flags
Setting is as follows.
High Byte/Low Byte
High byte
Low byte
*3.
Bit 12 specifies whether strict DLC check is used for RTR frames. If Bit 12 is OFF, only the CAN-ID
of an inbound RTR frame is checked for a match with a user message. If Bit 12 is ON, the CAN-ID
and the DLC of the RTR frame must match the user message to cause a response. Otherwise,
BFM #1270 to #1272 flag to be set. Bit 15 and Bit 12 can not be set ON at the same time.
*4.
Bit 15 defines if the message is transmitted as a data frame (Bit 15 OFF) or a Remote Transmit
frame (Bit 15 ON). Bit 15 and Bit 12 cannot be set ON at the same time.
3) Data bytes
Store the data to transmit. The data length of the transmit data is set by DLC.
62
7.1 [BFM #100 to #399] Sending/Receiving Pre-defined Layer 2 Messages
Name
High Byte
*1
11/29 bit CAN-ID low word
CAN-ID 42 LW
*1
11/29 bit CAN-ID high word
CAN-ID 42 HW
*1
Status/Control Flags
RTR/new/DLC
2nd data byte
4th data byte
*1
Data bytes
6th data byte
8th data byte
Reserved
*3
Bit 12
ON:
Strict DLC check for RTR
*4
Bit 15
OFF: Send data frame
*4
Bit 15
ON:
Send RTR frame
Number of data bytes to transmit (K0 to K8)
7 Layer 2 Communication Mode (11/29 bit ID)
Description
Message
Low Byte
DLC
1st data byte
3rd data byte
5th data byte
7th data byte
For save command, refer to Section 5.5
For function mode, refer to Section 5.4
Description
*3*4
Initial
Read/
No.
Value
Write
HFFFF
R/W
HFFFF
R/W
H0
R/W
H0
R/W
H0
R/W
H0
R/W
H0
R/W
-
-
Stored to
Flash ROM
*2
*2
*2
-
-
-
-
-
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