Page 16 AN-X4-AB-DHRIO (DH+) Nov 2022
Data Highway Plus Configuration
Use the web interface to set the AN-X baud rate, station number, and how much data the AN-X can
send when it gets the Data Highway Plus token.
The baud rate can be one of 57.6, 115.2 or 230.4 kbits/second.
The station number can be from 0 to 77 octal.
AN-X can send multiple messages when it gets the Data Highway Plus token.
When AN-X gets the Data Highway Plus token, it always sends at least one message if it has
any messages in its queue.
If there any more messages in the queue after it sends the first message, it can send up to
a maximum of the number of bytes configured in Token Bytes (less the number of bytes in the first
message).
For example, if Token Bytes is set to 250, when AN-X gets the token, it can send the first message in
its queue, for example, a write message that is 100 bytes long. It can then send further messages from
its queue up to a maximum of 150 bytes in total (250 – 100 bytes). It takes the messages in the order
in which they are found in the queue.
The range of Token Bytes is 0 to 300 bytes. The default is 250. A value of 0 disables sending
additional messages on the token.
Setting Token Bytes can improve the performance of AN-X on the Data Highway Plus network but it
can also load the destination station if AN-X is sending many messages to the same destination.
Monitor the No Memory NAKs diagnostic counter. If this counter is incrementing, it indicates that
some destination is receiving more messages than it can process. In that case, reduce the value of
Token Bytes to limit how many messages AN-X is sending.
To configure the Data Highway Plus properties of AN-X:
1. Start your web browser and enter the AN-X IP address as the web address.
2. Select Automation Network/DH+ Configure.
3. Select the baud rate.
4. Enter the Data Highway Plus station number, in octal.
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