buffered ReadScalers for multiple channels

[kklmn]

Hello,

We are trying to implement dead time correction to our 7-element SDD connected to an Xspress3. We do it by getting

data = dev.command_inout("ReadScalers",[LastFrameNo, ChannelNo]) #dev is proxy to xspress3 device

that returns a length-11 array per channel (detector element). One element of that array is used as a multiplicative corrector and two more are just stored in the Sardana output.

This works but it is slow. Every invocation requires ~10 ms per channel, which accumulates to a long delay and makes our fly energy scans really slow.

Q1. Is it possible to read all channels by one command?
Q2. Is possible to have a buffered readout, similar to our ROI controller that uses limaccd?

The solutions might already be present in the newer versions (?); currently we have
lima-xspress3-1.4.0, lima-core-1.7.2, tangods-limaccds-1.5.3, xspress3-sdk-2.0.0

Thank you!