4-26
Communication Interfaces
HPG 13150 400 V (A)
Dressler
®
HF-Technik GmbH
Prerelease version
CREATING AN IDEAL COMMUNICATIONS TRANSACTION
illustrates the steps in an ideal communications transaction
between a host computer and the HPG generator.
Figure 4-18. AE Bus communications transaction
T
0
: Host Transmits Message Packet
The host computer sends a message packet to the HPG generator. The
packet contains one of the following:
•
A command that requests data or status information
•
A command and data that change a parameter setting
•
An executable command
T
1
: Unit Verifies Host Transmission Packet
Once the HPG generator receives the host computer transmission message
packet, the HPG generator verifies that the message is intended for it and not
for another unit on the network. At this time, the HPG generator also analyzes
the checksum to verify that the message was received correctly.
Host
HPG generator
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