Psion Teklogix 7530 G2 user manual Test Polling Values, Window Delay, Poll Timeout, Late TX Limit

Chapter 5: Configuration

Protocol Tab

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.

140Psion Teklogix 7530 G2 Hand-Held Computer User Manual