SA.45s Chip-Scale Atomic Clock
SA.45s CSAC User Guide Revision D
11
Figure 7 • CSACdemo 1 Pulse-Per-Second Output Panel
To manually synchronize the CSAC from CSACdemo, make sure that a valid 1PPS reference is connected
to the 1PPS reference input and click
on the 1PPS panel. The CSAC synchronizes to the next
Sync Now
rising edge detected on the 1PPS reference input.
3.3.8.2
Automatic Synchronization
In Automatic Synchronization mode, the CSAC synchronizes its 1PPS output to every rising edge that
appears on pin 9. In this mode, synchronization may be performed by connecting a reference 1PPS
signal to pin 9 without needing to issue the RS232 synchronization command. Automatic
synchronization can be enabled/disabled through bit 3 (0x0008) in the mode register (see
).
Operating Modes (M)" (see page 24)
This mode can be useful, for example, in cases where the host system does not communicate with the
CSAC or in which the host system has no method or need to determine the state-of-health of the
reference source.
Note: Automatic Synchronization mode and Disciplining mode (see
1PPS Disciplining (see page 12)
mutually exclusive. Enabling either in the mode register disables the other.
To enable Automatic Synchronization from CSACdemo, select the
checkbox on the
Enable Autosync
1PPS panel and click
(see
).
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