User manual

Psion Teklogix 8525/8530 Vehicle-Mount Computer User Manual 187
Chapter 6: Tekterm Application
Radio Parameters
operating in the same system. If you choose to assign radio
addresses manually using the “Radio Address” parameter, use
this process for all units in the same system.
Radio Address
The value entered in the “Radio address” parameter is used to identify the
8525/8530 over the radio link. A unique value from 1 to 3840 must be assigned
for each 8525/8530 vehicle-mount computer.
Initial RTT (Round Trip Time)
Round trip time is the elapsed time between a vehicle-mount computer transmission
and an access point acknowledgement. Each 8525/8530 continuously adjusts the
acceptable round trip time, calculating the average elapsed time over a number of
transmissions. If an acknowledgement takes longer to receive than the average
round trip time calculated, the computer will send the transmission again.
Because 8525/8530s cannot calculate an average round trip time without a number
of transmissions, a starting point or “Initial Round Trip Time” is required. The
computer uses the time assigned to the “Initial RTT” parameter as a starting value
for round trip calculations. Once the 8525/8530 begins transmitting and receiving
data, this value will be adjusted to reflect the actual average round trip time between
transmissions and acknowledgements.
Protocol Type
“Protocol Type” is used to identify the Ethernet packet frame type sent by the
8525/8530. 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 8525/8530s and 9150s in your system use the same number.