LED Indicator Lights
OK -Normally ON. Indicates the basic condition of the module.
US1 and US2 - By default, LED US1 flashes to indicate activity on Port 1, and LED US2
flashes to indicate activity on Port 2. Both LEDs stay OFF when there is no port activity.
However, the function of these two LEDs can be custom configured by the user. Please see
GFK-0255 for custom configuration details
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