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Features and Functions 3
U2781A User’s Guide 35
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 3- 5.
To query the fan status, send the SCPI command below:
SYSTem:FSTATus? {1|2}
To query the fan speed in rpm, send the SCPI command below:
SYSTem:FSPeed? {1|2}