lsst.ts.ess.labjack

Overview

This package provides LabJackDataClient, data client for the ESS CSC that reads environmental data from a LabJack T4 or T7 module and reports it as one one or more ESS telemetry topics.

LabJackDataClient can only write array-based ESS telemetry topics, such as temperature and pressure.

This data client lives in its own package because it requires a LabJack-specific library. In order to run an ESS CSC that uses LabJackDataClient, all you have to do is install this package.

User Guide

To make LabJackDataClient available to the ESS CSC you must install this package and the LabJack software.

• Download the appropriate labjack-ljm installer from https://labjack.com/support/software/installers/ljm

• Install according to these directions: https://labjack.com/support/software/installers/ljm/ljm-installation-instructions

• Install the Python wrapper using pip install labjack-ljm.

Configuration

LabJackDataClient has its own configuration schema provided by the LabJackDataClient.get_config_schema class method (source).

This configuration specifies which LabJack to talk to, which inputs to read, and how to map those inputs to ESS telemetry topics.

Developer Guide

LabJackDataClient uses LabJack’s own labjack-ljm software to communicate with a LabJack T4 or T7. If this proves to be a problem, it is possible to use modbus instead.

Python API reference

lsst.ts.ess.labjack Package

Classes

BaseLabJackDataClient(config, topics, log[, ...])	Base class for ESS data clients that read a LabJack T7 or similar.
LabJackAccelerometerDataClient(config, ...)	Read 3-axis accelerometer data from a LabJack T7 or similar, and report using the accelerometerPSD topic.
LabJackDataClient(config, topics, log[, ...])	Get environmental data from a LabJack T7 or similar.

Class Inheritance Diagram

Contributing

lsst.ts.ess.labjack is developed at lsst-ts/ts_ess_labjack. You can find Jira issues for this module using labels=ts_ess_labjack.

Version History

• Version History