Chapter 22: The 9160 G2 As Base Station
Connectivity Options: Base Station Mode
226 Psion Teklogix 9160 G2 Wireless Gateway User Manual
Maximum Message Segment Size
This parameter determines the largest single message that can be passed to a
terminal in message mode or from a terminal in long message mode. In a 9160 G2
base station, the value entered in this parameter must be greater than or equal to the
value entered in the network controller or 9160 G2 mini-controller . The ra nge of this
parameter is between 32 and 116 characters. (Longer messages are broken into
several packets.) The default value is 100.
Number of Retries
This parameter determines how many times the 9160 G2 attempts to resend a
message if an acknowledgement is not received from the terminal. (These retries do
not necessarily occur in consecutive polls because incomplete messages are returned
to the bottom of the message queue.) After all retries have been exha usted, the termi-
nal is declared “offline”. The 9160 G2 does not transmit any messages to the terminal
until the terminal declares itself “online”. The allowable values range from 1 to 7.
Collision Size
This parameter reduces the probability that random noise on the radio link will be
interpreted as a collision between terminals. Response time increases when the 9160
G2 resolves collisions unnecessarily.
Collision Size places an upper limit on the number of characters that are received
prior to the receipt of an error message (CRC, CD lost, etc.). If eight is the value of
this parameter, eight or less characters followed by an error message appearing over
the radio link are considered noise. If there are more than eight characters, it is con-
sidered a collision. Acceptable values range from 3 to 10.
Free Window Factor
The value entered in this parameter determines if “free window m ode” will b e used.
In free window mode, all terminals that are not assigned any other window can use
the free window.
Entering a value of 0 (zero) in this parameter disables free window mode. Increas-
ing the value of this parameter increases the likelihood of a message being transmit-
ted in the free window.