Wireless Lan Cable Set (Optional) Led - Epson TM-T88V-i Technical Reference Manual

Wireless LAN cable set (optional) LED

With the LED on the wireless LAN unit, you can check the communication status of the product.
LED
On
Off
Flashing
20
The wireless LAN unit is not connected to the product. Or the product power is OFF.
This wireless LAN unit is connected to the product and is in operation. 
This unit is not communicating on a network.
This wireless LAN unit is connected to the product and is in operation. 
This unit is communicating on a network.
LED (Green)
Description