20
seconds the AVT-718 will automatically transmit a Mode 1 PID 0 request (this is an
OBD-II query). This is known as the “Keep Alive” message and is used to keep the
communications link open or active. The “Keep Alive” message can be changed or
disabled by the user.
2. Issue the $61 04 command. This will shut the K-line relay and connect the AVT-718 unit to
the network K-line. Unless changed by the operator (using the 53 03 xx yy command) the
AVT-718 defaults to the K-line baud rate of 10.4 kbps. Any network traffic will be received
by the AVT-718 unit and forwarded to the host computer.
5.5 CAN Mode
Consult the latest version of the “Master Commands and Responses” document for detailed
information on the commands supported by the AVT-718 while in CAN mode of operation.
The latest version of the “Master Commands and Responses” document can be obtained from our
web site at:
http://www.avt-hq.com
Operations in CAN mode are quite different than any other mode. The user is also referred to the
document “A Discussion about CAN” for detailed information on CAN operations and the
construction of packets between the AVT-718 and the host computer.
5.6 UBP Mode
Consult the latest version of the “Master Commands and Responses” document for detailed
information on the commands supported by the AVT-718 while in UBP mode of operation.
The latest version of the “Master Commands and Responses” document can be obtained from our
web site at:
http://www.avt-hq.com
Operations in UBP mode are very similar to operations in VPW mode.
Upon entering UBP mode, the AVT-718 will monitor for transmitted messages. If no transmit
activity is sensed within 4.5 seconds the AVT-718 will automatically transmit a “Keep Alive”
message. The “Keep Alive” message can be changed or disabled by the user.
5.7 Match Function - Message Filtering
A coarse filtering mechanism for messages received from the bus is provided by the AVT-718
Interface unit firmware. The match function is not applicable to CAN mode of operation. If the
match table is cleared (on power-up, reset, or $31 $7B command) all messages received from the
network are passed to the host.
Refer to the “Master Commands and Responses” document for updated information about the
Match Function. New capabilities include:
•
‘Pass to host’ on match and ‘discard’ on match functions.
•
Capability for 2-byte logical “AND” matching.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
