Patton electronic 2130 - Manual (Page 16)

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Figure 9. Front of Model 2124/2130, showing LED indicators
TXD- Trasmit data LED (green) blinks to indicate data transitions and
remains OFF when no data is transmitted (idle).
RXD- Received data LED (green) blinks to indicate data transitions and
remains OFF when no data is received (idle).
DTR- Control LED (yellow)- turns ON at power up to indicate to the DCE
that the 2124 is active.
CTS- Indication LED (yellow) - turns ON when the 2124 is ready to
receive data from the DCE.
DCD- Status LED (yellow) - Turns ON to indicate that a carrier detect
signal is received from the DCE.
CLK- Clock Signal LED (yellow) - blinks to indicate that the transmit
clock from the DCE is active. The CLK LED will remain OFF to indicate
the absence of the transmit clock.
PWR- LED (green) turns ON as soon as power is applied to the 2124/
2130.