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FX
-J1939 User's Manual
3U
2. Parameter C "transmission type" for each Layer 2 message
The transmission type defines the transmit/receive message and transmission trigger event of the message
as follows.
Transmission
Type value
K0
K1
K2
K3
K4
3. Parameter D "cycle time" for each Layer 2 message
This parameter is used when the transmission type (event) is set to K2 or K3.
The cycle time is in units of 10 ms
Note
• The cycle time should be set in consideration of the PLC scan cycle and communications response time,
etc.
• If the cycle time is set to K0, the value is automatically corrected to K1.
Cycle time is 10 ms in this case.
66
Message Type
When BFM #20 bit 0 is set to ON, the Layer 2 message is always transmitted.
When BFM #20 bit 0 is set to ON, the Layer 2 message is transmitted.
However, if data has not been changed, it is not transmitted.
The Layer 2 message transmits with following condition.
•
With a cycle time set by parameter D
•
BFM #20 bit 0 set to ON
The Layer 2 message transmits with following condition.
However, if data has not been changed, it is not transmitted.
Transmit
•
With a cycle time set by parameter D
message
•
BFM #20 bit 0 set to ON
The Layer 2 message transmits with following condition.
•
Request via RTR frames
Request via RTR frames works for maximum 28 transmit messages.
•
Manual transmit trigger flags
The Layer 2 message transmits when the corresponding manual transmit trigger flag in BFM
#1280 to #1284 is set to ON.
7 Layer 2 Communication Mode (11/29 bit ID)
7.2 [BFM #1100 to #1267] Pre-defined Layer 2 Messages Parameter
For transmission type, refer to Section 6.2
Transmission Trigger Event
For the manual transmit trigger flag, refer to Section 5.20
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