Experimental Physics and
Industrial Control System

Hi tech-talk,

I am new to epics, and using it to read data from a keithley scpi multimeter.

I want to get one shot readings, not periodic ones. So, to trigger an 'on-demand' measurement, I write a value to the .PROC field of my passive record to trigger processing, then read the value.

This works well, but I wonder if there is a 'read-data-now' function in epics which I have overlooked ?

##### excerpt from .proto file :

# one shot measurement
measure {
       ExtraInput = Ignore;
       out ":measure:\$1?";
       in "%f";
}

##### excerpt from .db file :

# read dc voltage, triggered by putting a value to measure_v_dc.PROC
record (ai, "$(PORT):measure_v_dc") {
       field (DESC, "voltage/dc one shot measurement")
       field (DTYP, "stream")
       field (INP,  "@scpi_keithley_2000.proto measure(voltage:dc) $(PORT)")
       field (SCAN, "Passive")
}

-- 
Jérôme Poincheval     poincheval at lpccaen.in2p3.fr     tel:02.31.45.29.87
LPC Caen                                    http://www.lpc-caen.in2p3.fr

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