GE Energy
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 |
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TXD | Serial transmission activity on the serial port |
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RXD | Serial reception activity on the serial port |
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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.
D400 Substation Data Manager User's Manual 73
