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FAST MODE OPERATION
Uplink/Downlink Monltorfng
When FAST Mode is first selected, the lower line of the d~lay
shows the
signal strength at which the 7920SE is receiving downlink signats from the
network Master Stations.
Press "T" once to monitor uplink communication received by Master
Stations (displays how well the Master Stations hear the 7920SE, or selected
one-way subscriber). The lower numbers on the display ind~te
the signal
strength at which the network Master Stations are receiving the 7920SE test
messages or selected one-way subscriber FAST massages*. The Master
Station display is indicated by the caret mark in the upper feft comer of the
display (described later).
Pressing "T" again displays uplink communimtion received by network Mhti
Stations (up to 7 stations for AlarmNet networks, and up to 3 stations for
Private Systems). The Mini Station display is indicated by the letter "M"
instead of the caret mark in the corner of the display. Press T
again to
return to the Master Station display.
The "T'"command test message transmissions end after about 5 minutes. To
return to the downlink display before this time, press "D".
NOTE The 7920SE wili not transmit any massages if l-WAY FAST mode is
selected.
FAST Mode Displays
The two-line FAST Mode display appears as foltows
~~
T~ical AlarmNet display
Twical Private System &play
The caret mark in the upper left comer of the dspfay indicates whether the
display is for Master Station uplink (upward pointing caret) or downlink
(downward pointing caret) messages. If monitoring Mini Stations, the letter
"M" replaces the caiet mark. The bouncing asterisk indicates that radm
activity is being heard.
IMPORTANTI: To ensure optimum commurdkationwith the network Master
Stations, downlink field strength levels should coneistentfy read 7 or h~her
and uplink levels should read 5 or higher.
Installer judgment should be used when determining acceptable antenna
locations. Since these readings are rest-time measurements, a sporadn high
reading does not necessarily mean reception will atways be gad.
Move the
antenna to various locations, checking the readings each time. Allow about
20 seconds of viewing for downtink signats and about 30 or more seconds for
uplink signals to get a more accurate display of radio activily.
Mount the
antenna at the location which gives the most number of consistently high
readings when the 7920SE is transm"~ing test messages (1 mode), and
when receiving downlink polls from the network (D mode).
- 18-
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