Features and Functions 2Keysight U2781A User’s Guide 39Fan Speed MonitoringThe U2781A USB modular instrument chassis is also integrated with a fan speedcontrol circuit. It is used to monitor the fan status and speed. The control circuitcommunicates 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 commandbelow:SYSTem:FSPeed? {1|2}
