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Chapter 2. Setting up the software

Focus on the section below the word Event:. This is a hexadecimal representation of the data in the ﬁrst

event of the buffer. The event that we made starts with 47, this is the total number of words (in hex) that

exist in the event. The size of the event is ﬁlled in by the Readout framework. The next word is the

number of words in our packet (in hex). This word is ﬁlled in by our documented packet. The third word

is the packet id in this case 0xff00 This word is also ﬁlled in by our documented packet object. The

remainder of the event is the data from the ADC hardware. The next two words are the ADC header; if

you break these down into binary representation the ﬁrst ﬁve bits will be the slot where the V785 is

located. If the packet ID and slot number are both correct then you are ready to move on to modifying the

SpecTcl Skeleton.

Complete documentation of the data read from the ADC hardware is given by the CAEN V785 manual.

This manual can be found online at CAEN website: http://www.caen.it/

Exit the Readout program by typing the following to the Readout program:

% end

2.2. SpecTcl Histogramming Software

The procedure for setting up SpecTcl parallels that of settting up the Readout software:

• Copy the skeleton for SpecTcl into an empty directory

• Modify this skeleton to unpack the raw events SpecTcl gets from the online system or from eventﬁles

into a set of parameters.

• Modify the Makefile to incorporate your changes into a tailored SpecTcl, and compile the tailored

SpecTcl

• Test your SpecTcl on event data acquired by your Readout software.

2.2.1. How to copy the SpecTcl skeleton

At the NSCL, current versions of the SpecTcl skeleton are located in the directory

/usr/opt/spectcl/current/Skel. The following commands will create a new directory and obtain

a copy the SpecTcl skeleton, called MySpecTclApp:

mkdir -p ~/experiment/spectcl

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ADC 400F Handbuch Seite 21