→I2C

according to Wikipedia (http://en.wikipedia.org/wiki/I%C2%B2C): I²C ( Inter-Integrated Circuit , alternately spelled I2C or IIC , most commonly pronounced I-squared-C ) is a multimaster serial single-ended computer bus invented by the Philips semiconductor division, today NXP Semiconductors , and used for attaching low-speed peripherals to a motherboard , embedded system , cellphone , or other digital electronic devices. ...

according to http://www.i2c-bus.org/i2c-bus/: The I2C bus was designed ... to allow easy communication between components which reside on the same circuit board. ... I2C is not only used on single boards, but also to connect components which are linked via cable. Simplicity and flexibility are key characteristics that make this bus attractive to many applications. ...

logi.CAD 3 provides blocks for I2C elements to program I2C-elements.