Capture data

The :DATA PVs are used to capture data from the panda. These can be viewed from the DATA screen.

• The file directory and name are chosen with :DATA:HDFDirectory and :DATA:HDFFileName.

• The number of directories that the IOC is allowed to create provided they don’t exist is determined by :DATA:CreateDirectory. The behavior of this signal is the same as the identical PV in areaDetector.

• DATA:DirectoryExists represents whether or not the directory specified exists and is writable by the user under which the IOC is running.

• :DATA:NumCapture is the number of frames to capture in the file.

• :DATA:NumCaptured is the number of frames written to file.

• :DATA:NumReceived is the number of frames received from the panda.

• :DATA:FlushPeriod is the frequency that the data is flushed into frames in the client.

• :DATA:Capture will begin capturing data.

• :DATA:CaptureMode is one of the three capture modes listed below.

First N mode

Begin capturing data and writing it to file as soon as it is received. Stop capturing once NumCapture frames have been written or the panda has been disarmed.

Last N mode

Begin capturing data in a buffer, once capturing has finished write the last NumCapture frames to disk.

Forever mode

Keep capturing and writing frames. Once the panda has been disarmed wait for it to be armed again and continue writing.