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The USB LED
The USB LED is located just below the Power LED.
It is a tri-color LED, capable of glowing green,
orange, or red.
The USB LED is unlit when:
• The Reference 600+ is not powered.
• The Reference 600+ does not have a USB
cable plugged into the USB port on the
rear panel.
• The computer end of the USB cable is not
plugged into a USB port on a computer or
hub.
• The USB cable is not supplying USB power
to the Reference 600+.
• The computer has disabled the USB port
going to the Reference 600+.
The USB LED glows a steady green if a valid USB
connection has been made and the Reference
600+’s communication processor is receiving
power along the USB cable.
The USB LED flashes orange whenever the
Reference 600+ is receiving or transmitting valid
USB messages to or from the host computer. It does
not flash if there is USB traffic addressed to other
devices on the USB bus, including messages aimed
at a different Reference 600+.
The USB LED indicates a solid red in one special
condition: when a firmware download is taking
place.
Caution: Interrupting a firmware update can cause a catastrophic failure of your
system. Do not turn off the Reference 600+, do not unplug the USB cable, and do not stop the
operation of the host computer when the USB LED is a continuous red color.
Do not interrupt a firmware update that is in progress. An incomplete update can render a
Reference 600+ inoperable until it is returned to Gamry for reprogramming.
Should the firmware update be interrupted, contact Gamry before starting the return process.
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