SCPI commands

[RSprik]

Hallo,
I am trying out some basic controlling of the RP with SCPI commands and the SCPI server using e.g. Putty or Python.

Some of the commands work fine (e.g. *IDN? or ACQ:AVG?, or "ACQ:SOUR1:DATA?").
However, some of the commands give an error or even terminate the connection (e.g. ACQ:SRAT?)
All these commands are on the beta release specifications.

I am using the most recent firmware on a v1.0 RP.
Any ideas what causes the problem?

Regards,
Rudolf Sprik

[Nils Roos]

ACQ:SRAT? crashes the scpi-server, that's a known bug.

Do you have problems with any other commands ?

[RSprik]

Hallo Niels,
did not try all commands but for example with Putty as terminal in raw serial mode:
Acquire
=======
ACQ:SRAT? crash
ACQ:SRAT:HZ? ERR!
ACQ:SRAT 1_9MHz ERR!ERR!ERR!

Data read
=========
ACQ:SOUR1:DATA? works
but partial reads such as
ACQ:SOUR1:DATA:STA:END? 10,13 ERR!
Also the syntax of the partial reads is a bit unclear to me.
Should one set the bounds and then do a query ?

The triggering and generator functions seem to work.

The SCPI interface could be a nice feature of the Red Pitaya.
It is an easy way of control without the need to run code on the RP and accessible from any program running on the host.
Perhaps someone can write a Bazaar application like a macro processor
that allows a direct SCPI interface with the RP and lists all available commands.

Regards,
Rudolf Sprik

[Calum314]

Hi all!

Further to RSprik's questions I am also having some trouble with SCPI commands. I am currently using MATLAB to acquire data from my red pitaya. I use the command:

SignalStr=query(RP,'ACQ:SOUR1:DATA?')

However, this is too slow. About 20ms using a Wifi dongle and 40ms with direct ethernet connection. (Connection to LAN not possible.) I do not need all 16834 samples in the buffer for my purposes, but the SCPI commands to only read a portion of the buffer are not returning useful results. For example

query(RP,'ACQ:SOUR1:DATA? 10000,12000')

still returns a full buffer worth of samples. Is this a bug or am I doing it wrong?

Thanks
Calum

[Nils Roos]

I am not sure you are using the right syntax for reading a portion of the buffer - if you observe the full reply you will notice that an "ERR!" follows the samples, meaning that the "ACQ:SOUR1:DATA?" was processed and then the "10000,12000".

One of the commands for partial reading is defined as "ACQ:SOUR#:DATA:STA:END?". However, using a command like "ACQ:SOUR1:DATA:STA:END? 10000,12000" or variations thereof, I was not able to get partial data, only parse errors. The answer lies somewhere in the functions for lexical parsing of the scpi-server, waiting for you to find it.

[rafbar]

'ACQ:SOUR1:DATA:STA:N? 1000,1500'

should work