Abstract: A system for monitoring inter-integrated circuit (I2C) communication includes a power supply, a battery backup unit, an I2C serial clock line (SCL) coupled between the power supply and the battery backup unit, an I2C serial data line (SDA) coupled between the power supply and the battery backup unit, and a controller. A first monitor line is coupled between the controller and the I2C serial clock line, and a second monitor line is coupled between the controller and the I2C serial data line. The controller is configured to monitor a digital communication transmitted on the I2C serial clock and data lines between the power supply and the battery backup unit, interpret a message included in the monitored digital communication, and perform a control function according to the interpreted message.

Abstract: A method for communicating data from a device to an object external to the device includes encoding one or more operating parameters of the device into a data sequence, and activating a light source of the device to generate a series of light pulses to represent the data sequence to communicate the encoded one or more operating parameters to an object external to the device. Another method includes capturing with a camera a series of light pulses from a light source of a device, and decoding the series of light pulses into data representing one or more operating parameters of the device. Example devices and systems employing the methods are also disclosed.