Post summarizing some changes and current configuration of the acromag crate.

Some useful previous posts:

• https://nodus.ligo.caltech.edu:8081/CTN/1564 (a previous summary, there are also some useful links there)
• https://nodus.ligo.caltech.edu:8081/CTN/1539 (some starter links for initial setup)
• https://nodus.ligo.caltech.edu:8081/CTN/1545 (reference to more LIGO documentation using EPICS Modbus with CDS)
• https://nodus.ligo.caltech.edu:30889/ATFWiki/doku.php?id=main:resources:computing:acromag (Aidan's wiki tutorial on setup of acromag cards themselves)
• https://nodus.ligo.caltech.edu:8081/CTN/1573 (some notes on interfacing the TTFSS box with acromag digital outputs and how to get that working)
• https://nodus.ligo.caltech.edu:8081/CTN/1574 (Aidan's notes on calibrating acromag outputs, can't find input calibration, might be in paperlogbook only)

I've made a few modifications to the Acromag crate.  There are three cards a XT1221-000 (8 differential inputs) a XT1541-000 (8 DC outputs + 4 digital I/Os) and a  966EN-4006 (Six Channel RTD/resistance).  Up to this time we have been adding channels one by one as we need them. I wanted a few more slow monitor channels so I just went ahead and connected all the rest of the remaining analog input and output channels to finish the job.  I also replaced some of the shorter cabling for the BNC front panel connectors with longer cables so there is a bit more slack inside the crate for these wires.

In time it might be good to put a few LEDs in the front pannels from the binary outputs of the XT1541 card so that we can get a visual blink indicator that some of the perl scripts are running. Alternatively, we can go back to interfacing these with the TTFSS boards as was done in PSL:1573.

A DIN rail mountable power supply (PS5R-SC24) was also fitted inside the rack to replace the variable voltage lab power supply.  This had been a temporary setup. This new power supply provides up to 30 W at 24 V from 110 V AC. The AC in line is strain relieved with a cable tie put through a hole I popped in the side of the crate.

Some rearranging of channels:

Previously the PZT/FFS fast controls monitors for the north and south path were inputted through the acromag channels 4 and 5. This was because at the time we only had short BNC cable connector feed throughs.  The order of channels now corresponds the the front panel labeling. The mapping of inputs/outputs+Resistive RTD unit is as follows. The present database file is attached below for reference.

# Database file for PSL lab implemeation of modbus from AcroMag cards
# Last updated: 2016 Sep 02
# By: Andrew Wade

# This file is the master database for the AcroMag cards.  Analog input channels
# are listed first followed by output channels and then temperature/resistance
# channels from the 966EN card. Those channels without a speific use are given
# generic names accociated with the front pannel. 
# Changes since last:
# - More BNC were added to the front pannel and so there was a need to add more