Opticon ESL - Manual (Page 21)

Opticon ESL
DEMO KIT
User Manual
21
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 30x15 seconds =
450 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 it‟s 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 in the range of channel 11 to 26 can be
scanned by adding the channel in the dash-separated list of channels.
By default the channels 11 to 15 are enabled (11-12-13-14-
15). Channel 11 can‟t be
disabled to make sure that when an ESL that is not associating to any base station and its
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 Number of times the ESL has been reset (automatically and manually)

LQI Indicator of the signal strength from an ESL (from ESL to base station)

LQI BS Indicator of the signal strength from an ESL (from base station to ESL)

MAC 16-digit MAC address of the ESL

Poll Time of the latest poll that has been received from the ESL

Type Hardware variant of the ESL

Version Software version of the ESL
5.6. Configuring of base stations
Base stations have very few configurations besides the configuration of the Ethernet
module (which will be described in chapter 5.6.3). The only main configuration is the RF
channel on which the base station operates.
5.6.1. Configuring the RF channel
The base station always operates on a single RF channel, which can be selected in a
range of channel 11 to 26 (as specified by the IEEE 802.15.4 standard).
When using multiple base st
ations it‟s also strongly recommended to use a different RF
channel for each base station within range to improve the maximum throughput of data and
reduce data collisions.
Since the base station / ESLs, which apply the IEEE 802.15.4 standard, operate on the
same frequencies as i.e. WIFI and Bluetooth it‟s important to make sure that a base station