You are talking about the I2C, Inter Integrated Circuit bus. It's a 2-wire serial interface standard defined by Philips Semiconductor. I was originally used to connect a CPU to pheripheral chips in a TV-set. It consists of two active wires and a ground connection.
Ok, so far the explaination of the interface.
1. You can basically interface trough LabVIEW with a Digital I/O board. You just access the digital lines and convert the information.
Like in the attached llb, Demo_I2C. This example uses normal Traditional Daq functions to access the I/O lines from a NI digital board.
2. There has been a driver developed by one of our Alliance members. This driver communicates with chips through the Parallel port. Check the following link:
3. FPGA boards are always a nice solution too. Just put the convertion algorithm + DIO access on a FPGA. (more expensive solution ofcourse). It's no really a high speed data transfer so you don't really need FPGA for the speed.
BTW: Search on our website for I2C. You will get more hits then.