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Chapter 5: Configuration
Protocol Tab
140 Psion Teklogix 7530 G2 Hand-Held Computer User Manual
Window Delay
Important: The value assigned to this parameter should not be changed from
the factory setting without a clear understanding of the timing of
the radio protocol.
This parameter specifies the amount of time (in milliseconds) the 7530 G2 should
add to each response window in order to accommodate the receive/transmit
switching characteristics of the radio. The value assigned must be compatible with
other units and base stations in the system. The default setting of 19 is based on the
requirements of a 2 level modulation narrow band radio, operating at 9600 baud.
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 7530 G2 should
detect at least one poll from a base station. As each “Poll Timeout” passes without a
successful poll from the base station, the 7530 G2 channel quality decreases. If the
channel quality falls to below 46%, the unit 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
7530 G2 can make a transmission. After this threshold, the transmission will not be
attempted and the 7530 G2 will try again at the next opportunity. For example,
suppose this parameter is set to 5. From the beginning of the response window,
the 7530 G2 can be up to 5 milliseconds late sending a transmission. Beyond
this threshold, the transmission is not attempted. The hand-held 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.