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9 Command Interface
9.4 Request PGN
75
FX
3U
-J1939 User's Manual
1
Introduc
tion
2
Specifi
cations
3
Inst
allati
on
4
Wi
rin
g
5
Al
lo
ca
tion of
Buf
fer
Memor
ies
6
J1939 C
omms
Mode
7
La
ye
r 2
C
omm
uni
cation
M
ode
8
PL
C RUN>
S
TOP
Me
ssag
es
9
Co
mmand
Interface
10
Comm
uni
cation
Setti
ngs
Proc
edure
9.4
Request PGN
This command can be used to request a J1939 message frame with a certain PGN from the network.
This command is prohibited in Layer 2 communication Mode.
This command is supported in the FX
3U
-J1939 firmware Ver. 1.10 or later.
Note
It is not possible to request PDU1 PGNs with a different DA than the current FX
3U
-J1939 node address (BFM
#28). The PS byte of the requested PDU1 PGN must be set to H00.
e.g. FX
3U
-J1939 BFM #28 = H80
*1.
PGN to be requested is specified in the 18 bits, bit 0 to 17, in BFM #1001 and #1002 as shown below.
*2.
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.
*3.
Destination node address. Set HFF to this BFM to send a broadcast request. Valid range of the
destination node address is K0 to K253, or K255 for broadcast. Destination address must be different
from the FX
3U
-J1939 address (BFM #28).
*4.
The number of data bytes received (sum of the data buffer and extended data buffer).
*5.
Data buffer (standard frames up to 8 bytes)
*6.
Extended data buffer
When more than 8 bytes of data are received, 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 received in several frames.
BFM #1001/#1002
BFM #1004
Description
HB100
H00 to H7F,
H81 to HFD
Valid setting, FX
3U
-J1939 will send a request for PGN HB100, expecting a response with PGN
HB180 (HB100 + BFM #28 value).
HFF
Valid setting, FX
3U
-J1939 will send a Broadcast request for PGN HB100, expecting a response
with PGN HB1FF (HB100 + HFF).
HB101 to HB1FF
x
INVALID setting for PDU1 Format PGN request.
BFM No.
Description
TO (Write Access)
FROM (Read Access)
High Byte
Low Byte
BFM #1000
Command:
H1200
H1201:
Reception complete
For other response codes,
refer to Section 9.8
BFM #1001
PGN bit 15 to 0
*1
Received PGN bit 15 to 0
BFM #1002
PGN bit 17 and 16
*1
Received PGN bit 17 and 16
BFM #1003
Priority
*2
Received priority
BFM #1004
Destination address
*3
Received source address
BFM #1005
Not used
DLC (Data Length Count)
*4
BFM #1006
2nd data byte
*5
1st data byte
*5
BFM #1007
4th data byte
*5
3rd data byte
*5
BFM #1008
6th data byte
*5
5th data byte
*5
BFM #1009
8th data byte
*5
7th data byte
*5
BFM #1010
10th extended data byte
*6
9th extended data byte
*6
BFM #1011
12th extended data byte
*6
11th extended data byte
*6
.....
.
.....
.
.....
.
BFM #1066
122nd extended data byte
*6
121st extended data byte
*6
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) PDU Format (PF) PDU specific (PS)