User's Manual
i-Q350L RTLS AS & i-Q350L RTLS AH
USER MANUAL
VISIBILITY DELIVERED. PAGE 17 OF 28
4.5. Limitations of the User Data Field
The total length of the broadcast message (burst or ping) is limited to 50 Bytes. Depending on the
broadcast message options, these are the allowed number of bytes for the user data:
Message Type
Length of User Data
User Data only
max. 50 Bytes
Marker | User Data
max. 38 Bytes
Push Button | User Data
max. 43 Bytes
Push Button | User Data | Marker
max. 32 Bytes
4.6. RTLS Settings
Note: These settings can be found in the ILR Tag Configuration software tool in the edit block “RTLS”
The RTLS Transponder allows precise location calculation by ranging to up 15 reference nodes (i-SAT
300, i-PORT M 350 RTLS) at the same time. By default, this is done at an interval set by the
parameter “Ranging Interval”. In addition, the RTLS Transponders contain a motion sensor with a
software filter (see next subchapter) that switches between standard and alternate ranging intervals.
This is set with the parameters “Ranging Behavior”, “Ranging Interval” and “Alternate Ranging
Interval”. Ranging describes the process used to measure the distance between a Transponder and a
reader through the exchange of a specific set of messages. A ranging can be initiated based on time
(interval) or event (motion or application request)”.
Adjustable parameters in the section “RTLS” are:
2.4 GHz Output Power: This is the Tx power for the RTLS ranging. Increasing the output power
will greatly impact the communication range, but also have a massive impact on the power
consumption. The following table shows the power consumption during a transmission depending
of the output power.
Output power in
dBm
Power consumption increase compared to 0
dBm
Estimated range*
0
0 %
40 m
10
9 %
170 m
* Estimated range in outdoor operation and in line of sight
Ranging Behavior:
The ranging process consists of multiple bidirectional communications, in order to calculate the distance
between the Transponder and the reader. i-Q350L RTLS Transponders are able to identify if they are in
motion or stand still. In the case of movement, the Transponder will switch to the “in motion” behavior
and use the alternate ranging interval. Two behaviors are available and described hereafter.