Slow Monitoring & Slow Monitoring & Recording System, Status Recording System, Status

SummarySummary

Glenn Horton-Smith Glenn Horton-Smith

KSUKSU

(presented by C. Lane, Drexel)(presented by C. Lane, Drexel)

Quick SummaryQuick Summary

““1-wire” chips communicate using a “bus” 1-wire” chips communicate using a “bus” of only one wire (+ground).of only one wire (+ground).

Chips provide sensors for voltage, Chips provide sensors for voltage, temperature, etc.temperature, etc.

The bus is inverted logic, wire-OR, with The bus is inverted logic, wire-OR, with pull-up provided by the master, and pull-pull-up provided by the master, and pull-down by devices on the busdown by devices on the bus

Each chip has a unique ID, factory set.Each chip has a unique ID, factory set. Inexpensive, low EM radiation, easy to Inexpensive, low EM radiation, easy to

work with.work with.

How we’ll use themHow we’ll use them

The plan is to use the 1-wire chips in The plan is to use the 1-wire chips in “powered” rather than “parasitic” “powered” rather than “parasitic” mode: transmit +5V and 0V power, mode: transmit +5V and 0V power, signal and signal ground, for faster signal and signal ground, for faster performance.performance.

Use CAT5 wiring and modular Use CAT5 wiring and modular connectors for interconnections.connectors for interconnections.

BranchesBranches Mfr. Spec for reliable operation is Mfr. Spec for reliable operation is

300m/branch, with each chip equivalent to 300m/branch, with each chip equivalent to 0.5m, etc. 0.5m, etc.

In principle, we could instrument an entire In principle, we could instrument an entire detector with one branch…detector with one branch…

But it makes more sense to have more But it makes more sense to have more branches, perhaps with coupler chips to branches, perhaps with coupler chips to isolate and boost signals.isolate and boost signals.

Multiple branches also allow disabling Multiple branches also allow disabling some branches, isolating faults, etc. some branches, isolating faults, etc.

Estimated that we will need 256 chips/labEstimated that we will need 256 chips/lab

TestsTests

A few small-scale tests with ~4 A few small-scale tests with ~4 devices over a few hundreds of devices over a few hundreds of meters of CAT5 cable have been meters of CAT5 cable have been carried out at KSU.carried out at KSU.

GAHS and an REU are doing more GAHS and an REU are doing more significant tests this summersignificant tests this summer

A large-scale test with hundreds of A large-scale test with hundreds of devices will be carried out before the devices will be carried out before the full system is purchased.full system is purchased.

For more informationFor more information

http://neutrino.phys.ksu.edu/DC/Slowhttp://neutrino.phys.ksu.edu/DC/SlowMRS/MRS/