Keysight U2781A, User Manual, Page: 39 / 45

Features and Functions 2
Keysight U2781A User’s Guide 39
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 I
2
C interface. Refer to Figure 2-8 .
To query the fan status, send the SCPI command below:
SYSTem:FSTATus? {1|2}
To query the fan speed in revolutions per minute (rpm), send the SCPI command
below:
SYSTem:FSPeed? {1|2}