Based on the W3100A hardwired TCP/IP stack chip from WizNET, this E-blocks board adds Ethernet functionality to an existing microprocessor based system without the necessity of developing the TCP/IP software stack. As well as the Ethernet protocol the module supports 10/100 connection and a number of protocols including UDP, IP, ARP, ICMP, DCHP, ARP, DLC and MAC. The unit interfaces to a microprocessor using I2C serial communication. The patch jumpers on the board allow more than one Ethernet module to be connected to the I2C bus. Flowcode macros for this E-block are available in the Professional version of Flowcode.