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D400 Substation Data Manager User's Manual 73
Serial Port Status LEDs
The Serial Port Status LEDs provide a visual indication of the status for each serial
communication port. For a given serial communication port:
LED Display Status Description
TXD Serial transmission activity on the serial port
RXD Serial reception activity on the serial port
Notes:
• If a pair of LEDs is not lit, it does not indicate a problem, only that the connected
device is not active at that moment.
• If a serial communication card slot is empty, (that is, no card is installed) the serial
Receive (RXD) LED may be lit.