LED Lines




Green Ethernet status LED




Yellow Ethernet status LED


L3 (SG)


LED output 3, Green status LED


L4 (SR)


LED output 4, Red status LED

Line functions defined by the application firmware are shown in blue

The EM200 has four LED control lines. All lines have the same internal structure and the LEDs should be connected to these lines as shown on the schematic diagram below. Maximum load for each line is 10mA.

EM200_led control

EG and EY lines reflect the status of the Ethernet port. The EG LED is switched on whenever a live Ethernet connection is detected by the EM200's Ethernet port. The EG LED is momentarily switched off whenever the EM200 receives a network packet. The EY shows whether current Ethernet link is of 10BaseT type (EY off) or 100BaseT (EY on).

SG and SR lines are under firmware control and display various status information depending on what firmware is running at the moment. Follow the links below to learn more about the behaviour of these LEDs under different conditions:

SR/SG behavior in the monitor firmware.
SR/SG behavior in the application firmware.