RX/TX and Ethernet adapter

Dear all,

If have an Arduino Uno and an a recent Ethernt Shield to connect it to the internet. I wonder whether the RX/TX pins are still available to communicate with a third device or are they busy with the communication between the Arduino and Ethernet shield? If the two device do not communicate this way, how do they?



OK, I found the answer on http://arduino.cc/en/Main/ArduinoEthernetShield


Arduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Duemilanove and pins 50, 51, and 52 on the Mega.