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making it possible to connect more ESLs to a single base station.
5.4.4 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 30 polls, so by default the time out is 450 seconds (30 polls x
15 seconds).
5.4.5 Scan channels
Once an ESL has associated (connected) to a base station, it operates on a single RF channel.
However when itʼs not yet connected to a base station, the ESL will automatically scan a range
of RF-channels for base stations. The range of RF channels that an ESL will scan for base
station is configurable. All channels between11 and 26 can be scanned by adding the channel
in the dash-separated list of channels.
By default, the channels 11 to 15 (i.e., 11, 12, 13, 14, and15) are enabled. Channel 11 canʼt be
disabled. This is to ensure that when an ESL that is not associating to any base station, and
the ESLʼs RF channel range is unknown, it can always be retrieved by configuring a nearby
base station to channel 11.
5.5 ESL status information
Each ESL will also periodically transmit the following status information.
Battery voltage: Current battery voltage
•
Boot counter:
•
LQI:
•
LQI BS:
•
MAC:
•
Poll:
•
Type:
•
Version:
•
5.6 Configuring of base stations
Base stations have very few configurations besides the configuration of the Ethernet module
(which will be described in section 5.6.3). The only main configuration is the RF channel on which
the base station operates.
21
Number of times the ESL has been reset (automatically and manually)
Indicator of the signal strength from an ESL (from ESL to base station)
Indicator of the signal strength from an ESL (from base station to ESL)
16-digit MAC address of the ESL
Time of the latest poll that has been received from the ESL
Hardware variant of the ESL
Software version of the ESL
ESL User Manual
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