Rice Lake 880 Performance Series Panel Mount Indicator/Controller - Modbus TCP Interface Option Installation and Programming Manual - Manual (Page 12)

8 Modbus Interface Installation and Programming Manual
Link/Activity LED (Item 3)
Ethernet Interface (Item 4)
The Ethernet interface supports 10/100Mbit, full or half duplex operation.
LED State Description
Off No link, no activity
Green Link established
Green, flickering Activity
Table 2-3. Link/Activity LED