Before starting the networked software configuration on your Node, make sure you did the following:
- put a FAT32 formatted SD card into the SD card reader on the Ethernet Shield (preferably blank, but with sufficient free space available, anyway)
- make sure there is a DHCP server on your LAN (in an average Internet-enabled home typically the DSL router provides this service)
- plug an ethernet cable to the Arduino Ethernet Shield's RJ-45 connector (the oher end of the cable should be connected to the network with DHCP and Internet Gateway, obviously ;-))
- set the Serial Port to point to your Node board
- open the Arduino IDE's Serial Monitor (optional, if having problems)
- set the baud rate to 57600 (up to node versions 1.09) or 9600 (from node version 1.10) bauds
- reset / power-cycle your APDuino device
- if having problems and reading serial: you should see the Node software coming up, printing its version number, then initializing services such as timekeeping, storage, networking...
- if having problems and reading serial: for a brand new Node (having a blank SD card inserted), assuming your SD and network was initialized properly, a message will be printed, telling that your Node is unconfigured and a URL will be provided so you can "Claim your Node" (assign it to your user account) on Apduino Online .
Assuming you have checked all the above and ready to move on, read more on completing your Node configuration online