User's Manual

i-Q350LX GPS -SAT
USER MANUAL
VISIBILITY DELIVERED. PAGE 24 OF 31
3.2. Ping Rate
Note: These settings can be found in the Tag Configuration software tool in the section “Broadcast”
• Active: Activates or de-activates the broadcast function that regularly sends out messages.
• Broadcast Interval: 0 = no broadcast messages are sent, value > 0 = Broadcast interval in seconds. This
can be set in steps of 0.5 sec, from 0.5 sec up to 300 sec.
• Broadcast Message Options: The options in this field depend on the capabilities of the tag. The
subchapter “Limitations of the User Data Field” lists the possible options of this tag type.
• User Data Length: Configure the number of Bytes from the “User Data” that is sent with a broadcast
message. The number starts from Byte 0 (zero). The limits of the User Data length are described at the
end of this chapter
3.1. 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
GPS | User Data
max. 42 Bytes
Marker | User Data
max. 38 Bytes
Marker | User Data | GPS
max. 31 Bytes
3.2. Information on Burst Settings
The parameter “Time between Bursts (Marker)” is not simply a delay time. It is in fact a timeslot. In this
timeslot the tag chooses a random moment to do a single burst. This avoids that burst collisions with other
tags, that are simultaneously triggered by the same marker loop. These timeslots are repeated until all bursts
are sent.
In the event that dozens of tags are triggered to burst at once, this value can be increased. The result of
increasing the slot width is there will be a longer time interval between other bursts being sent. Fore example
with an increased value of 700 ms and 8 bursts, the amount of time for all bursts is 5.6 seconds.