ECU-1251 Series User Manual 10
2.2.2 Serial Communication Status Indicator
2.2.3 Ethernet Status Indicator
LED Color Description
TX1 Orange Blinking, Serial port 1 data being transmitted
RX1 Green Blinking, Serial port 1 data being received
TX2 Orange Blinking, Serial port 2 data being transmitted
RX2 Green Blinking, Serial port 2 data being received
TX3 Orange Blinking, Serial port 3 data being transmitted
RX3 Green Blinking, Serial port 3 data being received
TX4 Orange Blinking, Serial port 4 data being transmitted
RX4 Green Blinking, Serial port 4 data being received
LED Color Description
Link1 Yellow Lighting, Ethernet not connected
Act1 Green Blinking, Ethernet data being transmitted
Link2 Yellow Lighting, Ethernet not connected
Act2 Green Blinking, Ethernet data being transmitted