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7.1.e – LED Behavior
The Keyspan USB 4-Port Serial Adapter part number USA-49WG comes equipped with LED lights that report the
status of the Keyspan adapter USB hardware and serial port.
The following table shows all of the possible states of these LED light and what they mean:
Color State Signicance
Red O The Keyspan adapter is not connected or not receiving power from your
computer.
Red On The Keyspan adapter is connected and is receiving power from your
computer.
Green O The Keyspan adapter soware and hardware are working properly.
(and Red light ON) The Keyspan serial port is available for use.
Green On-Steady Light The Keyspan serial port is ‘in use’ by an applicaon on your computer and
is ready to send and receive data to and from your serial device.
Green On-Blinking Rapidly The Keyspan serial port is sending and/or receiving data.