User manual

Psion Teklogix 7535/7530 Hand-Held Computer User Manual 145
Chapter 5: Configuration
Protocol Tab
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 hand-helds 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 7530 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 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 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.
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