18
5.2 VPW 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 VPW 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
When in VPW mode of operation the interface is always listening to, or monitoring, the external
network. All bus traffic is reported to the control computer by the interface. Transmit operations
occur only when initiated by the control computer.
5.3 PWM 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 PWM 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 PWM mode are quite different than in VPW or UBP modes. There are essentially
two modes of operation while PWM mode.
5.3.1 PWM Active Node
One mode is where the AVT-718 is an active node. As such it is capable of receiving and
transmitting network messages. Note that only messages destined for the AVT-718 will be
received from the network, acknowledged to the network, and forwarded to the host computer.
Upon entering PWM mode or resetting the HBCC device the HBCC is set up with node address
of $F1 (for node-to-node messages) and the functional message table is set for OBD-II messages:
$4A, $4B, $5A, $5B. These settings can be altered by the user. Consult the two documents:
“HBCC Initialization Parameters” and “HBCC Interrupt Register Definitions” for more details
on how to change the configuration of the HBCC.
5.3.2 PWM Passive Network Monitor
A second mode of operation is “network monitor” mode. In this mode the AVT-718 becomes a
passive network node and cannot transmit any network messages. The AVT-718 will see all
network messages, including acknowledgments, and forward all information to the host
computer.
When in PWM mode:
◊
Enter “network monitor” mode by sending the command:
83 01 02 16
◊
Exit “network monitor” mode by sending the command:
83 01 02 72
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