Vaisala WS425FG - Manual (Page 39)

Chapter 4 ________________________________________________________________ Operation
VAISALA_______________________________________________________________________ 37
CHAPTER 4
OPERATION
This chapter contains information needed to operate Vaisala Ultrasonic
Wind Sensor WS425 F/G.
Power On/Off
The power switch is located in the power supply enclosure at the top
left. When turned on, the two LEDs labeled +5 V and +12 V will be
turned off if their respective supply is operational. If neither is turned
on, check the 0.25 A fuse and make sure that AC power is present.
System Operation
In normal system operation, the sensor communicates with the host
system system via two fiber optic cables. This normal state exists when
no cable is plugged into the RS-232 DB-9 connector labeled TEST in
the power supply.