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Chapter 5: Configuration
Narrow Band Radio Setup
114 Psion Teklogix 8525 G2/8530 G2 Vehicle-Mount Computer User Manual
Polling
The default values for the Polling parameters are dependent on the value assigned to
the Modulation / Baud Rate parameter in the Radio tab.
Table 5.3 Polling Parameters
Sync Delay
Warning: This parameter should not be changed from its factory setting
without a clear understanding of radio protocol timing.
The Sync Delay parameter specifies the delay between the base station transmission
and the first response window, measured in milliseconds. The value assigned to this
parameter must be compatible with other terminals and base stations in the system.
The allowable range for this parameter is between 1 and 40.
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 8525 G2/8530 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 8525 G2/8530 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 8525 G2/8530 G2 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.
Modulation / Baud Rate Sync Delay Window Delay Poll Timeout
4 Level / 19200 17 20 20
4 Level / 9600 17 23 25
2 Level / 9600 17 19 22
2 Level / 4800 25 23 37