Contemporary Controls AI-SRVR-1TB5 Посібник - Сторінка 15
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By default, the Ext Timeout (extended timeout) value of the AI-SRVR is set to STD (no
extended timeout). If the physical size of the network is so great that extended timeouts
are required, then the Ext Timeout value can be increased to 16X, 8X or 4X. However,
care must be exercised that all nodes within the ARCNET network are set to the same
extended timeout value — or the network will suffer disruptions.
The COM20022 ARCNET controller within the AI-SRVR is capable of programmable
reconfiguration timeout values. The Recon Timeout setting controls this parameter
which is measured in node counts of 255 (STD), 64, 32 and 16 — allowing operation
with shorter timeouts when the number of nodes permits it.
However, care must be
exercised in two respects:
If 16Nodes is selected, the network must include a device
whose node ID is 255. And all nodes within the ARCNET network must operate at the
same reconfiguration timeout value — or the network will suffer disruptions.
If you want the AI-SRVR to receive only those ARCNET packets destined for its unique
node ID, set Receive All to OFF. Otherwise, set it to ON.
A provision is included for purging the mailbox of an Ethernet client that has ceased to
communicate with the AI-SRVR. The Nodelist Timeout value determines the wait for a
client connection to "time out" and have all of its mailbox data purged. Each count in
this field corresponds to a time value of 0.1 second. The value is 1 by default, but can
be as high as 100000 which equals 10000 seconds (almost 2 hours and 47 minutes).
The number of messages that can be stored in each node's mailbox is limited by the
size of the onboard memory. Each mailbox constitutes a FIFO (first-in-first-out) type of
register. Thus, when a mailbox message limit is exceeded, the first message that was
stored in that mailbox will be lost to make room for the latest message. By default, the
message limit of each mailbox (FIFO Depth) is 5, but this parameter can be set to as
low as 1 or as high as 10. The user can manage memory usage by lowering this value
to accommodate many mailboxes or raising it if only a few mailboxes are used.
The TCP Port number and the UDP Port number are each 5001 by default. Each of
these can be set to a value in the range of 1025–65535. However, the only reason to
change either of these values would be if they were in conflict with another application.
Therefore, in almost all situations, these values should be left unchanged
You can exit the configuration screen using any of three CTRL-K codes. (These require
pressing CTRL and K simultaneously, releasing, then pressing the final key):
CTRL-K, Q allows you to exit without saving any changes made to the configuration.
NOTE: Upon re-displaying the configuration screen, changes you have made will still
appear on screen (and give the illusion of having been saved) as long as the equipment
is not restarted — but these field values have not been stored to EEPROM.
CTRL-K, S allows you to exit and save your changes to EEPROM. However, your
changes will not take effect until the AI-SRVR is restarted.
CTRL-K, R saves your changes to EEPROM and restarts the unit so changes will take
effect once reboot completes (some 15 seconds on new units, 50 seconds on older ones).
NOTE: Mailbox content is held in RAM and lost during a restart or loss of power. Only
the configuration settings are stored in EEPROM and are immune to power disruption.
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