Measurement Computing WLS-IFC, User Manual

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12
Chapter 3
Functional Details
External components
The WLS-IFC has the following external components, as shown in Figure 3.

Status LEDs (USB Activity, Transmit, Receive, Received Signal Strength indicators)

Power LED

USB connector
Figure 3. WLS-IFC component locations
Status LEDs
The LEDs indicate the communication status of USB and wireless operations. An LED bar graph indicates the
strength of the signal received by the remote device. Refer to the table below for the function of each LED.
LED functions
LED Function
Power Steady green – the WLS-IFC is connected to a computer or external USB hub.
Blinking green – indicates activity over the USB connection.
Received Signal Strength (RSS)
indicators 3 green LED bar graph. The LEDs will turn on when receiving a wireless
message and stay on for approximately 1 second after the end of the message.
They indicate the amount of fade margin present in an active wireless link. Fade
margin is defined as the difference between the incoming signal strength and the
device’s receiver sensitivity.

Three LEDs on : Very strong signal (> 30 dB fade margin)

Two LEDs on : Strong signal (> 20 dB fade margin)

One LED on : Moderate signal (> 10 dB fade margin)

No LEDs on: Weak signal (< 10 dB fade margin)
USB activity Green LED – indicates activity over the USB connection.
Transmit Yellow LED – indicates transmitting data over the wireless link.
Receive Red LED – indicates receiving data over the wireless link.
Power LED
The
Power
LED is lit when the WLS-IFC is connected to a computer or external USB hub.
USB connector
The USB connector pr5V power and communication.