Link Timeout - Banner SureCross DX80 Gateway Pro Reference Manual

Examples
6
P/N 134421

Link Timeout

The Link Timeout parameters control how the wireless network devices behave during an RF
communications failure.
A link timeout is a failure in the radio communications between the Gateway and a Node. A
link is timed out when the Gateway has polled a Node and failed Maximum Bad Count times
consecutively. In the sample shown, the Gateway must poll and fail to communicate with a Node
seven times before the link is considered to be timed out.
A radio link is recovered when the Gateway polls and successfully communicates with the failed
Node Re-link Count times before the Max Bad Count is reached. Successful communications do
not have to be consecutive to reach the Re-link count number.
Set the Default Output Conditions checkboxes to establish when the default output conditions are
applied.
Auto-Recover - Selecting the auto-recover option forces the Gateway to attempt to re-
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establish communications with out-of-sync nodes after a polling error condition is indicated.
The Gateway polls the failed Node and must successfully communicate with the Node
Re-Link Count times before the error condition is erased. This parameter is only used on
the Gateway. Without the auto-recover feature selected, the user must manually reset error
conditions or the host system must reset the error condition.
• Gateway Link Failure - The Gateway detected an RF communication problem with a Node.
All outputs on other devices that are linked to inputs on the failed device are set to the
default states.
• Host Link Failure - A Modbus timeout forces all device outputs to the default states. This
parameter applies to every device that sets this flag.
Node Link Failure - A Node detected an RF link problem and set its own outputs to the
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default states.
Out of Sync - When an out-of-sync condition is detected, all Node outputs are set to the
•
default value. This parameter applies only to the Nodes.
Power Up - All device outputs are set to the default value on initial power-up.
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In the sample shown, the default output conditions are applied when the Gateway detects the failed
link and when the Node detects the failed link. Also selected is the auto-recovery option.
To decrease the time to determine a link timeout, decrease the Polling Interval. Reducing the Max
Bad Count parameter will also detect a link failure quicker, but will potentially cause more false
time-out conditions.
To increase the time to determine a link timeout, increase the Polling Interval or the Max Bad
Count. For radio networks extended to the limits of the transmission range, increasing the Max Bad
Count may help reduce the link timeout errors.
Click the Send Flags button to submit changes to the flags to the devices. Use the Prev and Next
buttons to scroll to the next SureCross™ device.
SureCross™ DX80 Web Configurator
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www.bannerengineering.com • Tel: 763.544.3164
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