User guide

System Output
D2119 Dart RTLS User Guide 86
Where <GDOP> is the Geometric Dilution of Precision value for the location data with prefix of
‘G’. When the GDOP result is not meaningful this field contains an asterisk.
Non-locate Details
Non-locate details is an optional field that is available for the output data stream. This
information helps assess why location data is not available for a particular tag event.
Non-locate details can take on the values described in the following table.
Value
Description
P
Only presence data expected. The Receiver is not part of a virtual group and is set up to
provide only P data.
M<VG#>
Minimum units for the virtual group not met. For example, if the computation for minimum
units is set to 3, then less than three Receivers detected this tag transmission.
B<VG#>
Bounding Box not met. The system computed the information, but the resulting coordinates
were outside of the values defined for the Group Boundary (on page 36).
C<VG#>
Convergence not met. The system computed the information but failed to reach a
convergence result.
R<VG#>
Reference is currently not available for virtual group computation. This may also indicate
reference suspension failure when Presence Detection is configured.
G<VG#>
GDOP threshold value for the virtual group exceeded when filtering is enabled.
D<VG#>
DQI threshold value for the virtual group exceeded when filtering is enabled.
If you have enabled Non-locate details (see Configuring output control (on page 43)), the output
P data appears in the following format, with an additional field <Non-locate details>:
P,<tag #>,<X>,<Y>,<Z>,<battery>,<timestamp>,<unit>,<Non-locate details><LF>
where <Non-locate details> is the reason for the P data output.
In the following example for system output from a Dart RTLS Hub, Min-units are not met:
P,0000099C,6.3,43.4,8.5,13,1162219029.404,A1,M1
P,0000099C,1.1,2.2,8.5,13,1162219029.404,11,M1
P,0000099C,99.8,43.4,8.2,13,1162219029.404,41,M1
In the following example, Receiver units 31 and 41 have detected tag 101616AD ; the Non-locate
details (M1) indicates that a location computation was not made because virtual group 1 did not
have enough Receivers to detect this tag event (minimum number of Receivers for VG1 was set
to 3).
P,101616AD,100.0,15.4,8.5,11,1162219029.441,31,M1
P,101616AD,99.8,43.4,8.2,11,1162219029.441,41,M1
In the following example, Convergence is not met:
P,00002294,99.8,43.4,8.2,11,1161175614.527,D1,C1
P,00002294,6.3,43.4,8.5,12,1161175614.527,A1,C1