HV technical

Here is some boring technical info about HV control. Note these somewhat old URLs as a starting point

http://hallaweb.jlab.org/equipment/daq/HVhelp.html

http://hallaweb.jlab.org/equipment/daq/gen_slow_control.html

The above URLs will need to be modified / updated to provide User guidance.

A note about the architecture:

1. "hvs" (aka "hvg") = Java GUI that provides User interface (author: Roman Pomatsalyuk)

2. LecroyHV_Shim = Perl server, listens on a telnet port, talks to hvs. This code emulates the obsolete (no-longer-existing) motherboards on the LeCroy 1458 HV crate (author: Brad Sawatzky). This server must run on the PC that is connected by RS232 to the HV crate.

3. i2lchv_linux_bob = Bob's version of Brad's version of Javier's code that does the low-level communication with the HV crate. (original author: Javier Gomez, but don't blame him for my hacks). i2lchv_linux_bob talks via R232 to the HV cards using a primitive "language". The LecroyHV_Shim Perl script connects to i2lchv_linux_bob via the "Expect" module of Perl.

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Nov 12, 2013. Attempts to use Intel PC as the PC that is nearby the LeCroy HV crate.

from root on adaql1, see /root/diskless/i386/Centos5.8

./snapshot = directories local to the cpus. e.g. see /snapshot/intelha3 for intelha3.

./root = directory shared by all the cpus. However, not (yet) writeable by the cpus.

On the intel cpu, if you want to create or touch files, you must use the local filesystem.

/root/diskless/i386/Centos5.8/snapshot/intelha3/root (from adaql1)

appears as

/root (local filesystem on intelha3)

However, if you want to compile code that every intel PC uses, you must use

/root/diskless/i386/Centos5.8/root on adaql1