GE 994-0089 User Manual

 GE 

Energy 

 

D400 Substation Data Manager User's Manual  

 

The Serial Port Status LEDs provide a visual indication of the status for each serial 
communication port. For a given serial communication port: 

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.