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FX
-J1939 User's Manual
3U
7.
Layer 2 Communication Mode (11/29 bit ID)
This chapter describes the data transfer locations and setting of the Layer 2 communication (11/29 bit ID)
mode. In this mode up to 42 predefined messages can be sent/received.
Moreover, Layer 2 messages can be sent via CIF.
In 11 bit ID mode (BFM #21 = K11), the module sends and receives only CAN messages with an 11 bit
identifier. In 29 bit ID mode (BFM #21 = K29), the module sends and receives only CAN messages with a 29
bit identifier.
Note
• To ensure that the FX
necessary to set BFM #20 bit 0 to ON before reading the received message (FROM) and after writing the
transmitted message (TO) to the module.
• To activate the Layer 2 communication (11/29 bit ID) mode, write into BFM #21 the value K11 or K29, and
reset the module.
• BFMs (#40 to #48, #500 to #973, #1300 to #1799, and #3000 to #3879), which are active in J1939
communication mode, are not active and not accessible.
7.1
[BFM #100 to #399] Sending/Receiving Pre-defined Layer 2 Messages
The data transfer locations of the Layer 2 communication (11/29 bit ID) mode are as follows.
Note
The following settings of each message have to be defined in request configuration mode, before requesting
online mode.
• The CAN-ID LW, CAN-ID HW and transmitting data byte number (in RTR/new/DLC) in the following BFMs
• Layer 2 message configuration in BFM #1100 to #1276
Set the parameters (transmitting/receiving message, etc.) for each message.
BFM No.
BFM #100
BFM #101
BFM #102
BFM #103
BFM #104
BFM #105
BFM #106
7.1 [BFM #100 to #399] Sending/Receiving Pre-defined Layer 2 Messages
-J1939 module can handle the Layer 2 message in a consistent way, it is
3U
For Layer 2 message configuration in BFM #1100 to #1267, refer to the Section 7.2
Name
High Byte
*1
11/29 bit CAN-ID low word
CAN-ID 1 LW
*1
11/29 bit CAN-ID high word
CAN-ID 1 HW
*1
Status/Control Flags
RTR/new/DLC
2nd data byte
4th data byte
*1
Data bytes
6th data byte
8th data byte
7 Layer 2 Communication Mode (11/29 bit ID)
For BFM #20 bit 0, refer to Section 5.3
For module reset, refer to Section 5.7
Description
Message
No.
Low Byte
DLC
1st data byte
3rd data byte
5th data byte
7th data byte
Initial
Read/
Stored to
Value
Write
Flash ROM
*2
HFFFF
R/W
*2
HFFFF
R/W
*2
H0
R/W
H0
R/W
-
H0
R/W
-
H0
R/W
-
H0
R/W
-
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