E20-10
User Manual
5.2.2. Synchronization in E20-10
If synchronization is not required, that internal ADC conversion frequency source is used in
E20-10
as well as simple program data acquisition start. But,
E20-10
has also external
synchronization tools both as on
ADC conversion frequency
as on
acquisition start
. These are two
independent mechanisms which can be used both as separately and as together.
Synchronization on ADC conversion frequency
(within possible range 1.0 – 10 MHz) is
performed using SYNC line which can be configured in software to output or to input (
).
Due to this the following problems can be solved:
•
ADC conversion frequency -based synchronization of several
E20-10
. To do this
you should switch on several
E20-10
according to diagram "master-slaves"
connecting similar circuits GND and SYNC of several
E20-10.
•
Conversion frequency synchronization signal
E20-10
generating to external device,
for example, to frequency meter to monitor conversion frequency.
•
External synchronization on TTL-signal (with frequency of 1.0 – 10 MHz and on-
off time 2) for external synchronization of one or more
E20-10
on ADC conversion
frequency.
The following problems may be solved using acquisition start synchronization
via START
line configured in software to input or to output (
•
Transmitting of acquisition program start internal signal through START line for
synchronous starting data acquisition in other modules
E20-10
. To do this, you
should switch on several
E20-10
according to diagram "master-slaves" connecting
similar circuits GND and START of several
E20-10
•
E20-10
data acquisition start synchronization from external source of TTL -signal.
•
Transmitting of acquisition program start internal signal in
E20-10
through START
TTL-line to external device for synchronization or indication of data acquisition
process.
Module
E20-10
of revision "В" supports
additional permit conditions for ADC data
recording in buffer memory of
E20-10
(on edge in selected ADC channel, disabling transmission of
given amount of frames from acquisition start)
,
as well as
additional conditions for acquisition
stopping
(on data collected frames amount). In addition, "on level" data acquisition mode series is
added in revision B. These additional synchronization conditions improve synchronization tools of
module
E20-10
of revision "B" in comparison with revision "A".
The following limitation should be noted:
additional conditions for ADC data recording
and acquisition stopping permit conditions can be applied inside one E20-10 module only and they
have no effect on START signal behavior in intermodule synchronization according to master-
slaves principle.
At the same time, if desired, in different modules
E20-10
the similar auxiliary
conditions for data recording and acquisition stopping permit conditions may be made
,
and as a
result, under connecting "master-slaves" modules
E20-10
on START signals you may achieve
conditions for synchronous operation of
additional conditions for data and acquisition stopping
recording permit conditions
in different modules
E20-10 .
It is natural, that in multimodule connections of
E20-10
on "master-slave" principle the user
must judiciously configurate control lists, interframe delays (and in
E20-10
of revision B the
additional conditions for buffer write enable as well) of these modules in order to be able to make
sense of relative time connections among the sample flows obtained from these modules. Master
E20-10
should be earlier started in software to collect data, because they should enter in start
waiting from master, and in this case, upon slave data acquisition starting completion the data
acquisition in masters will be started in hardware and synchronously with slave
E20-10
.
It should be noted, that when SYNC line configurating to function "slave" (under external
synchronization of ADC conversion frequency from digital TTL- sync signal external source) it will
