User guide

D2119 Dart RTLS User Guide 83

11 System output

Dart RTLS system provides different outputs format options, Dart and Z-SLMF, which are

supported on TCP ports 5117and 5118 respectively. All tag data from the Dart hub, are coded in

ASCII and sent over the LAN interface. To retrieve tag data from the Hub, you need a client

program using the stream communication protocol and a connection to the output port. This

section describes the format of tag data in the Dart output data stream

In This Section

Basic system output ............................................................................. 83

Data Quality Indicator (DQI) .............................................................. 85

Geometric Dilution of Precision (GDOP) .......................................... 85

Non-locate Details ................................................................................ 86

Locate Details ........................................................................................ 88

Basic system output

The format of tag location output is as follows:

Where:

 <Data Header> represents the tag dimensional information. It can take on the following

values:

 R: 3-D calculation valid for X, Y, and Z (R-packet). 3-D calculations require four or more

non-coplanar Receivers to detect an event and for software computations to complete

successfully.

 T: 2-D calculation valid for X and Y (T-packet). 2-D calculations occur when three

Receivers respond and the software is able to compute the X and Y locations. The Z value

is estimated to be the average heights of associated Receivers.

 O: 1-D estimated calculation for X and Y (O-packet). This can occur in the event of only 2

Receivers responding such that the software estimates the tag position to be at an

intermediate point along the line connecting the Receivers.

 P: Presence indicator (P-Packet). This indicates that a Receiver detected a tag. Presence

indicator data may be sent only when the Presence Detection flag is set for the RTLS

Receiver, and when less than Min_unit number of Receivers are heard (that is not