Wire Replacement I/O (900 MHz): User Manual and Reference Guide
4.2.10 Retry Odds
Retry Odds
Setting
Description
Default Setting:
0
Options:
Any number between 0 and 9.
Terminal Menu:
(5) Edit MultiPoint Parameters > (3) Retry Odds
Description:
l
While packets transmitted from the I/O Master to the I/O Slaves are NOT
acknowledged, packets transmitted from I/O Slaves to the I/O Master are
acknowledged.
l
It is possible that more than one I/O Slave attempts to transmit to the
I/O Master at the same time.
l
Therefore, it is important that a protocol exists to resolve contention for
the I/O Master between I/O Slaves.
l
This is addressed through the
Max Slave Retry
and
Retry Odds
parameters.
l
After the I/O Slave has unsuccessfully attempted to transmit the
packet the number of times specified in the
Max Slave Retry
parameter, it attempts to transmit to the I/O Master on a random basis.
l
The
Retry Odds
parameter determines the probability that the Slave
attempts to retransmit the packet to the I/O Master; a low setting
assigns low odds to the I/O Slave attempting to transmit.
l
Conversely, a high setting assigns higher odds.
Example
: Consider two different I/O Slaves in a MultiPoint
network, one with a strong RF link and the other with a weak RF
link to the I/O Master.
If an I/O Slave has a weak or poor link, set
Retry Odds
to
0
as it
may become a "chatty" Slave and lockup the network, causing
a loss of communication.
l
When
Retry Odds
is set to
0
, after the I/O Slave has exhausted the
number of retries set in the
Max Slave Retry
parameter and still not
gained the I/O Master’s attention, the I/O Slave’s data buffer is purged.
FreeWave Recommends
: A
Retry Odds
set to
0
is recommended for
most networks.
4.2.11 Slave/Repeater
The
Slave/Repeater
parameter allows a radio to switch between Slave and Repeater functions.
LUM0008AG Rev Sep-2015
Page 71 of 131
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