User manual

Chapter 5: Configuration
Protocol Tab
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Psion Teklogix 8525/8530 Vehicle-Mount Computer User Manual
Poll Timeout
This parameter (in units of 16.6 ms) sets the time-out value used for automatic
channel switching. “Poll Timeout” is the time during which the 8525/8530 should
detect at least one poll from a base station. As each “Poll Timeout” passes without a
successful poll from the base station, the 8525/8530 channel quality decreases. If the
channel quality falls to below 46%, the terminal begins searching for a new channel.
A value from 1 to 200 can be assigned to this parameter.
Late TX Limit
The value entered for this parameter (measured in milliseconds) sets the maximum
allowable deviation time from the start of a response window during which an
8525/8530 can make a transmission. After this threshold, the transmission will not
be attempted and the 8525/8530 will try again at the next opportunity. For example,
suppose this parameter is set to 5. From the beginning of the response window, the
8525/8530 can be up to 5 milliseconds late sending a transmission. Beyond this
threshold, the transmission is not attempted. The vehicle-mount waits for the next
opportunity.
The allowable range for this parameter is from 1 and 10 – the default value is 2.
Test Polling Values
• Tap on the Test Polling Values button to test the polling values indicated in
this dialog box without committing them to memory.
To commit the new polling values to memory:
• Tap on the OK button – the dialog box is closed and the new values
are saved.
To discard the new values, and retain the existing values:
• Tap on the X button at the top of the dialog box.