by KNERDY » Wed Aug 23, 2017 4:38 am
Right next to the Ethernet port, there is a connector with 3 pins sticking out labeled GND, RX, and TX.
You will need to purchase a USB to TTL cable (can get them for about $2-$3 off eBay), and connect the correct PINS from that cable those PINS. The docs with the cable should identify them for you.
Once connect, if you have Windows, look in the device manager for Serial Port, and look which COM# has been assigned to that USB cable you plugged in.
Then use the SSH application Putty, and select SERIAL on the connection type and put COM1, 2, 3, or 4 in the Serial line window and increase speed from 9600 to 115200.
This will connect you to the device as if you are looking at the device from a monitor connected. If it is functioning you will see some text appear in the Putty window. If you don't think the connection is functioning, you can try it on another device like a Arduino.