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6 J1939 Communication Mode
6.2 [BFM #500 to #973] Configuration Area
55
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
Transmission Type K2 and K3
Transmission type K2 and K3 are time controlled.
If the transmission was triggered by remote request or manual/PLC trigger, the interval timer is restarted, and
the next transmission will be suspended for the set interval to avoid unnecessary data traffic caused by
remote requests or manual triggers.
• Transmission type = K2
When the time interval elapses, the message is always sent.
• Transmission type = K3
When the time interval elapses, the message is sent. However, if data has not been changed, it is not
transmitted.
The user interval set for the message is restarted every time the message is transmitted.
In case the transmission is triggered by a request message from the network or manual trigger (BFM #1280 to
#1284), the next transmission after externally/manual triggered message will not be sent in the former interval
"*1," but in the new interval related to the external/manual trigger event.
BFM #20 bit 0
BFM #100 to #103
Data
Data message 1
(internal)
H0000
H0000
H5555
Configuration mode
Online mode
H5555
HAAAA
HAAAA
Transmit interval
BFM #25 bit 4
Transmission
Type K2
H0000
H0000
H5555
HAAAA
H5555
HAAAA
Transmission
Type K3
H0000
H5555
HAAAA
Transmit interval
Transmission
Type K2/K3
user interval
user interval
user interval
external/
manual trigger
*1
*1
*1