We had a couple of returned boards a few weeks back so we thought we'd have a play with them. We have plenty of the official Arduino Programmers around, but we've recently been Shrimping.it a fair bit recently and had a low cost USB to Serial converter already plugged into the machine. We thought surely it would work, but were unsure of the pin outs on the Arduino Ethernet Boards. After a short search via google, we came up empty. So headed to our stock selection and found an Arduino USB to Serial converter to copy the pin outs. They are as follows.