Re: streamdevice

[Sebastian Matkovich <sebastian.matkovich@gmail.com>]

rod gave me the right solution, in the first string i send i tell the device which channel i want to speak to and in the next string i send my command :)

2013/5/22 Rod Nussbaumer <bomr@triumf.ca>

Or he may mean channels within a device or module, such as channels within an oscilloscope or multichannel digitizer. In such cases, the method should be documented by the vendor of the device. There is no generic method or streamDevice-specific method for performing such selections.
A couple of things may be worth noting. In some cases, there is a specific SCPI command that effectively says 'for all subsequent commands, use channel n'. Where you are monitoring more than one channel on a periodic schedule, you can put that command into a single streamDevice protocol that may contain other commands that relate to that specific channel. You would probably do so for a number of protocols where you want to address specific channels. Moreover, a single protocol may be contrived that will work for all channels, where the channel number (or other identifier) is a macro variable (like \$1) that is passed to the protocol. The channel identifier might also be a PV such as an analog record or a multibit binary record, and this can be referenced an decoded in the protocol.

If Sebastian has a different meaning for the question, he should rephrase and expand on his intention.

   ---   rod.

On 05/22/2013 07:18 AM, Mark Rivers wrote:

I think he probably means the asyn "addr" field, used to select a specific address or channel of a device.

Mark

________________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Dirk Zimoch [dirk.zimoch@psi.ch]
Sent: Wednesday, May 22, 2013 4:24 AM
To: tech-talk@aps.anl.gov
Subject: Re: streamdevice

On 21.05.2013 18:45, Sebastian Matkovich wrote:

is it possible that you cannot access specific channels of a device
through streamdevice? or does somebody know how to do that?

What do you mean with "specific channels of a device"?

Dirk