Gantner Q Series Manual page 97

5.8.3.2
5.8.3.3
Sync. sample frequency
Time synchronization
Q.series
Gantner Instruments Test & Measurement GmbH
Life signal (watchdog)
Here you specify the communication errors for which an error
signal is to be set and whether it is to occur as a static signal or
dynamically (switching between on and off with the I/O toggle
time).
Synchronization
If you are using several modules on various interfaces (UARTs),
which operate at different measuring rates, for example because
not all modules support the same measuring rate, then with this
parameter you can ensure that those values transferred over an
interface (UART) with a slow measuring rate are also synchro-
nized to the time points at which a measurement is also present
that has been acquired with a fast measuring rate (Fig. 5-6).
Measuring rate 1
Measuring rate 2,
not synchronized
Measuring rate 2,
synchronized
Fig. 5-6 Data transmission at a synchronous sampling frequency.
With many Q.pac Test Controllers additionally specify which is
used as master (Use as master: Yes) and which are used as
slaves. The master (only one master is permissible) defines the
synchronization and then all slaves synchronize themselves to the
master.
If you want to use either several systems or to synchronize your
system through an external time source, you must specify how
the synchronization is to occur (refer also to Section 4.5,
Page 36).
1. Synchronization of several Q.pac Test Controllers through
one sync line
Connect the sync connections on the Test Controllers by syn-
chronization lines (plug-in terminal 2, connections 9 and 10,
refer to Section 4.4.2, Page 30). For this purpose use a
screened cable with twisted cores if possible. One (any) con-
troller becomes the master; on this one set Settings > Syn-
chronization > Input synchronisation protocol to None.
For the other Test Controllers specify Q.sync over RS485 as
the setting in the same dialog.
Configuration → Q.gate and Q.pac settings
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