SA.45s Chip-Scale Atomic Clock
SA.45s CSAC User Guide Revision D
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Figure 14 • CSACdemo Communicating with CSAC During Warm-Up
The title bar of the window indicates the unit serial number (here 1010CS01010). The main body of the
window shows most of telemetry values from the unit (see
"Telemetry (6 and ^)" (see page 20)
Initially, upon power-up, the status indicator
reflects CSAC's unlocked condition (BITE = 1). The left
field of the bottom status bar indicates the number of seconds until the next poll (here 9) and the right
field indicates the unit status (here Oven Warm-up).
In the event of communication failure, the status indicator appears as
. In this case, check the
cabling and power supply. The bottom left status bar may also indicate the source of the communication
failure. If the COM port is in use by another application, the status bar reports RS232 open failed,
otherwise, it will likely indicate Instrument not responding. If you are using a PC serial port other than
COM1, select
from the
menu and select a different COM Port as shown in
Options…
File…
. Select the correct COM port from the pull-down menu and click
to re-attempt
Apply Changes
communications.
3.5.6.3
Monitoring Communications
For development of application-specific embedded firmware for CSAC, it is helpful to observe the
communications between the CSACdemo program and the CSAC. Enable the
checkbox in
Show Trace
the
section of the
panel and click
to view the bidirectional
Communications
Options…
Apply Changes
protocol.
With the trace visible, the CSACdemo main panel appears as shown in the following screen shot.
