Chapter 8 CAN Bus
CPT7 and CPT7700 Installation and Operation User Manual v12
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Once the receiver is "on bus", it must be taken "off-bus" using CANCONFIG for any further configuration
changes using J1939CONFIG.
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The receiver is fully "on-bus" only once the J1939 address has been successfully claimed. This is reported
as "CLAIMED" status by J1939STATUS log.
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No messages will be sent or received until the receiver is "online" and an address is claimed. Outgoing
messages are not buffered; they are discarded until the receiver is online.
8.2.2 Example of Enabling the CAN Bus
1.
LOG J1939STATUS ONCHANGED
2.
J1939CONFIG NODE1 CAN1 <addresses>
3.
CANCONFIG CAN1 ON 250K
4.
SAVECONFIG
< J1939STATUS NODE1 DISABLED 0 0xFE
< J1939STATUS NODE1 CLAIMING 1 <address>
< J1939STATUS NODE1 CLAIMED <attempt count> <address>
8.2.3 Example of Modifying the CAN Bus Parameters
1.
LOG J1939STATUS ONCHANGED
2.
CANCONFIG CAN1 OFF
3.
J1939CONFIG NODE1 CAN1 <addresses>
4.
CANCONFIG CAN1 ON
5.
SAVECONFIG
< J1939STATUS NODE1 DISABLED 0 0xFE
< J1939STATUS NODE1 CLAIMING 1 <address>
< J1939STATUS NODE1 CLAIMED <attempt count> <address>
8.2.4 Example of Detecting an Address Claim Failure and Reconfiguring
1.
LOG J1939STATUS ONCHANGED
2.
J1939CONFIG NODE1 CAN1 <addresses>
3.
CANCONFIG CAN1 ON
< J1939STATUS NODE1 DISABLED 0 0xFE
< J1939STATUS NODE1 CLAIMING 1 <address>
< J1939STATUS NODE1 FAILED <attempt count> 0xFE
4.
CANCONFIG CAN1 OFF
< J1939STATUS NODE1 DISABLED 0 0xFE
5.
J1939CONFIG NODE1 CAN1 <addresses>
6.
CANCONFIG CAN1 ON
< J1939STATUS NODE1 CLAIMING 1 <address>
< J1939STATUS NODE1 CLAIMED <attempt count> <address>
