User Manual Part 2

IS-900 User Guide Page 89 of 159
In Figure 35, the “T” indicates that Station 1 (or the Tracker connected into port 1 of the
processor) is tracking. The “T” field next to each station number has different letter values that
indicate:
“T” = The station is tracking.
“X” = The station status is invalid or wireless channel is off.
“L” = The station is lost.
“ ” = No station is connected or the station state is “off”.
The statistics field below the station status is used to provide quick feedback of tracking
performance for each station. As shown in Figure 35, the “RC” shows that 11 ultrasonic
measurements where received and used during the last measurement cycle of this tracking
station.
Pressing the up/down buttons will cycle through the other statistics displays. Figure 37 shows a
zero value for the “RJ” or rejected measurement field indicating that all ultrasonic measured
values where used (none where rejected) during the last measurement cycle.
Figure 37 - Rejected Measurement Status for Tracking Station 1
The statistical values for “CI” or communication integrity (shown in Figure 38) are represented by
a percentage from 0 to 100%. 100% indicates the station is communicating with no errors or
missing records. For wired tracking stations, this value will always be 100%. If a station is
disconnected, it shows 0%. Anything in between might indicate a poor connection or an
excessive length of cable for a wired tracker, or for a wireless tracker, may indicate a weak signal
or radio frequency interference.
Wireless stations, typically show 90-100% because some records are lost or corrupted due to the
nature of the radio link. Lower percentages can occur when 4 or more radio sets are in range or
if interference from a source like a heavy used wireless LAN is present. If a wireless station
drops below about 50%, the link is assumed down and shows 0% until it is re-established. A
wireless station also shows 0% while it is asleep. When a station drops to 0%, “X” is displayed in
place of “T” or “L” for that station on the LCD.