Opticon ESL
ESL Server manual
v1.0.62.2
27
Scan channels
Temperature range
6.1.1. Associate interval
When an ESL is not connected to any base station it will automatically start looking for nearby
base stations. Since searching for base station consumes a relative large amount of power it will
not continuously search, but only once every couple of seconds. The associate interval
determines the time (in seconds) between two associating attempts of an ESL. The default
associate interval is currently 60 seconds.
If an ESL stays disconnected for a longer period of time, then the associate interval will start to
increase up to 15 minutes to minimize battery consumption.
The amount of power that is being consumed by the ESL, when it’s not connected to any base
station is also strongly related to the number of RF channels it is configured to search for base
stations. More information about the configuration of the ‘Scan Channels’ can be found in chapter
6.1.6.
6.1.2. Poll Interval
The poll interval specifies the interval (in seconds) at which the ESL sends a poll for data to the
base station. This parameter is the most significant configuration of an ESL since it strongly
determines the response time of an ESL (how fast is an image displayed) as well as the battery
life time.
By default the ESLs poll every 20 seconds once they’re connected to a base station. This means
that to response time of an ESL can be anywhere in between 0 to 20 seconds (unless the poll
doesn’t arrive at the base station due to interference).
The poll interval greatly influence the battery life time, so lowering it is not recommended. For
example, changing the poll interval from 20 seconds to 5 seconds will roughly triple the power
consumption and thereby shorten the battery life time by a factor of 3.
An advantage of making the poll interval bigger is the reduction of the used bandwidth per ESL,
making it possible to connect more ESLs to a single base station.
6.1.3. Poll timeout
The poll timeout specifies the number of polls without acknowledge from the base station after
which the ESL will time out its connection and start searching for another base station. The
default poll time out is currently 10 polls, so by default the time out is 10x20 seconds = 200
seconds.
6.1.4. Display orientation
It is allowed to mount ESLs up-side-down. To make sure that the images are displayed correctly,
the display orientation can be changed to ‘Flipped’.
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