9 Command Interface
9.3 Send PGN
74
FX
3U
-J1939 User's Manual
9.3
Send PGN
This command can be used to transmit a J1939 message frame with a certain PGN and destination address.
This command is prohibited in Layer 2 communication Mode.
*1.
PGN to be transmitted is specified in the 18 bits, bit 0 to 17, in BFM #1001 and #1002 as shown
below.
*2.
If a PDU1 formatted PGN (the destination address is included in the PGN low byte) is transmitted:
-
The destination address in BFM #1004 must match the address set in the PGN low byte (BFM
#1001).
-
The low byte of the PDU1 PGN is set to H00 and the target address is set in BFM #1004.
If an invalid value is set, BFM #1004 will display the address to show the mismatch between PGN-
destination and BFM #1004 destination. If BFM #1004 is set to H00, and the BFM #1001 low-byte is
set to a value other than to H00, BFM #1004 will display HFFFF (instead of H0000).
*3.
The valid range of the message priority, the first three bits in the 29 bit ID, is between K0 to K7.
K0 is the highest priority.
*4.
Specifies the destination node address. Valid range of the destination node address is between K0 to
K253, K255 (broadcast). Destination address must be different from the FX
3U
-J1939 address (BFM
#28).
*5.
Sum of the data buffer and extended data buffer. Valid range of the number of data bytes to be
transmitted is between K0 to K122.
*6.
Data buffer (standard frames up to 8 bytes)
*7.
Extended data buffer
When more than 8 bytes must be transmitted, the first 8 bytes are located in BFM #1006 to #1009,
and bytes 9 to 122 are stored in BFM #1010 to #1066. If the data exceeds the standard length of 8
bytes, the data will be segmented and transferred in several frames.
BFM No.
Description
TO (Write Access)
FROM (Read Access)
High Byte
Low Byte
BFM #1000
Command:
H1000
H1001:
Message written to transmit buffer
For other response codes,
refer to Section 9.8
BFM #1001
PGN bit 15 to 0
*1*2
H0000
BFM #1002
PGN bit 17 and 16
*1*2
BFM #1003
Priority
*3
BFM #1004
Destination address
*2*4
BFM #1005
DLC (Data Length Count)
*5
BFM #1006
2nd data byte
*6
1st data byte
*6
Not used
BFM #1007
4th data byte
*6
3rd data byte
*6
BFM #1008
6th data byte
*6
5th data byte
*6
BFM #1009
8th data byte
*6
7th data byte
*6
BFM #1010
10th extended data byte
*7
9th extended data byte
*7
...
...
...
...
...
...
BFM #1066
122nd extended data byte
*7
121st extended data byte
*7
BFM #1002
BFM #1001
Bit 2 to 15 (Bit 18 to 31)
Bit 1 (Bit 17)
Bit 0 (Bit 16)
Bit 8 to 15
Bit 0 to 7
PGN
Not Used (Set bit 2 to 15 to OFF.) EDP (Extend data page)
DP (Data page)
PF
PS
