Setting up the scaler readout

Setting up the scaler readout

Now that you have a Readout program that can read your event data, you can turn your attention to scaler data. Scalers are used to count rates in various channels of the electronics. The production readout program configures reads scalers as follows:

• The user creates and registers a set of Scaler objects with the readout framework.
• When the run begins, the readout program invokes the Initialize and Clear functions of each registered scaler.
• Periodically, while the run is active, and at other appropriate times, the readout program calls each Scaler object's Read function followed by it's Clear function to read and clear the module. Read appends data read from its scaler to an STL vector.

The Production readout framework has support for several scaler modules including CAMAC LRS 2551 and LRS 4434 modules, VME LRS 1151, and AEN V830 modules. In addition a ScalerBank module allows you to register a group of scaler modules as a single scaler. The CScalerModule class is intended as an organizational tool.

In this tutorial, we will assume that you need to read out Struck model 3820 VME scaler modules with base address 0xc00200.

• Writing a Scaler class
• Integrating your scaler readout with the readout

Setting up the scaler readout