Psion Teklogix Vehicle-Mount Computer 8255, User Manual, Page: 301 / 348

Teklogix 7035, 8255 & 8260 Terminals User Manual
D-17
Appendix D:Radio Parameters
Poll Timing
D.3.3 Poll Timing
Sync Delay
Important: This parameter should not be changed from its factory setting
without a clear understanding of radio protocol timing.
“Sync delay” specifies the delay between the time of 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 default setting of 17 is based on the requirements of a 2 level modulation
narrow band radio, operating at 9600 baud.
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 terminal 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 terminals 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 terminal should hear
at least one poll from a base station. As each “Poll Timeout” passes without a
successful poll from the base station, the terminal channel quality decreases. If the
channel quality falls to below 46%, the terminal begins searching for a new channel.
Sync Delay 17 1-40
Window Delay 19 1-40
Poll Timeout 20 1-200
Late Tx Limit 2 1-10
Poll Timing
Range