User's Manual Part 2

Chapter 6: Tekterm Application
System Parameters
180
Psion Teklogix 7535 Hand-Held Computer User Manual
Radio Address
The value entered in the “Radio address” parameter is used to identify the
7535 over the radio link. A unique value from 1 to 3840 must be assigned
for each 7535 hand-held computer.
Initial RTT (Round Trip Time)
Round trip time is the elapsed time between a hand-held computer transmission and
an access point acknowledgement. Each 7535 continuously adjusts the acceptable
round trip time, calculating the average elapsed time over a number of transmis-
sions. If an acknowledgement takes longer to receive than the average round trip
time calculated, the computer will resend the transmission.
Because 7535s cannot calculate an average round trip time without a number of
transmissions, a starting point or “Initial Round Trip Time” is required. The com-
puter uses the time assigned to the “Initial RTT” parameter as a starting value for
round trip calculations. Once the 7535 begins transmitting and receiving data, this
value will be adjusted to reflect the actual average round trip time between transmis-
sions and acknowledgements.
Protocol Type
“Protocol Type” is used to identify the Ethernet packet frame type sent by the 7535.
The default value –
2457 – assigned to this parameter identifies the Teklogix 802.IQ
protocol Ethernet packet frame types.
The “Protocol Type ID” should only be altered if the default value is already being
used to specify another application Ethernet frame type.
Important: If you change the value assigned to “Protocol Type ID”, ensure
that all 7535s and 9150s in your system use the same number.
6.15 System Parameters
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