Agilent Technologies U2781A manual Fan Speed Monitoring

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Features and Functions

3

Fan Speed Monitoring

The U2781A USB modular instrument chassis is also integrated with a fan speed control circuit. It is used to monitor the fan status and speed. The control circuit communicates with backplane USB device via I2C interface. Refer to Figure 3- 5.

To query the fan status, send the SCPI command below:

SYSTem:FSTATus? {12}

To query the fan speed in rpm, send the SCPI command below:

SYSTem:FSPeed? {12}

U2781A User’s Guide

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Contents Agilent U2781A USB Modular Instrument Chassis WA R N I N G Regulatory Markings Safety SymbolsThis Guide… Declaration of Conformity Regulatory Information for Australia/New Zealand Contents Contents Getting Acquainted Introduction Applications FeaturesChecking the Contents Product Outlook Operating Environment General SpecificationsPower Supply AC Input Electrical SpecificationsPhysical Layout Mechanical SpecificationsGetting Acquainted Installation T E Mount Kit InstallationModular Chassis Installation Hardware Requirements System RequirementsSoftware Requirements DAQ Driver InstallationInstalling the USB DAQ driver Installation Click Finish when the installation is completed Hardware Verification Agilent Measurement Manager Software InstallationInstallation Features and Functions Features and Functions USB Backplane SSI timing signal Functionality2USB backplane block diagram Trigger Bus 3Block diagram of Trigger Bus0...7 and Trigger OutExternal Trigger In Star Trigger Trigger OutSystem Reference Clock 5Block diagram of temperature monitoring and fan control Chassis Temperature MonitoringFan Speed Monitoring Modules Identification Identifying Modules LocationGeorgraphical Address SYSTCDES? Simultaneous Synchronization SSI 7Synchronization between modules in the chassis Features and Functions General Maintenance General Maintenance Contact us