Contemporary Control Systems BAScontrol20 User Manual - Manual (Page 22)

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4.9 LEDs
To aid in troubleshooting, several LEDs have been provided.
The BASC20 has an Ethernet LED that glows green when properly linked to
equipment operating at 10/100 Mbps and indicates activity by flashing.
LEDs to indicate I/O status follow the behaviour described in Table 2 below :
If the I/O channel is … Green indicates …
a Relay output the coil or triac is energized.
an Analog output the command is greater than zero.
a Contact input the contact is made.
a Pulse input the input state changed.
a Thermistor thermistor is connected
an Analog input the signal is greater than 1% of span.
Table 2
— LED Behaviour