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ADVANCED
DIAGNOST!CS
IMPORTANT!:
Since the 7920SE
Transceiver communicates with the
network Master Stations much more frequently than one-way transmitters
(because it is a polled unit), it is vital that the antenna be placad such that
consistently high readings are observed when using FAST Mode (refer to
FAST Mode procedures previously described). Failure to achieve minimum
field strength values may result in the 7920SE missing poll messages, thus
causing unnecessary communication failure messages.
If unsure, activate
FAST mode and recheck for proper antenna placement.
The 7920SE is a sophisticated device with many built-in diagnostic features.
This section explains some of these features and may be helpful when
discussing communication problems with authorized service representatives.
To use the diagnostic features, a computer terminal or 7720P Programming
Tool must be connected to the No. 7920SE (see PROGRAMMING section). If
using the 7720P, the LED on the 7720P will light whenever the 7920SE
transmits a message, thus making it easier to monitor transmissions.
Note:
Diagnostic
messages
are sent at 9600
baud.
Some
portable
computers may not be compatible with this data rate, and WWdisplay gadded
messages on the screen.
FAST MODE
FAST Mode was described in a previous section, and is a real-time
measurement of signal strength levels. A common cause of communication
problems is low signal strength. It is vital that readings for downlink messages
are consistently 7 or higher, and uplink levels (messages transmitted by
7920SE are 5 or higher. Radio communication can change with varying
environmental conditions, and for this reason, these readings must be
achieved.
If these readings are not achieved, move the antenna to a
location that provides these levels of signal strength.
NODE STATUS TABLE
The Node Status Table displays information regarding the network Master
Stations, and identifies the Master Stations that are operational, the field
strength at which the 7920SE is hearing them, and whether or not the
7920SE was polled.
In addition, the battery condition and other internal
functional information is displayed.
To activate the Node Status Table, prass "L" for long form display, or "N" for
one line at time display (for 7720P use), while the 7920SE is in Normal mode.
To only display Radio Status Information, Press 'S,
The "S" command is
compatible with both the computer terminal and the 7720P devices.
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