A system for measuring a parameter of a device comprising: a sensor for measuring the device parameter and generating a data signal representing the measured parameter; a microprocessor coupled to the sensor for activating the sensor on a first periodic basis to measure the device parameter; a memory in the microprocessor for storing the generated data signal representing the measured parameter; a transmitter coupled to the microprocessor; and a receiver coupled to the microprocessor, the microprocessor periodically partially awakening to determine, on a second periodic basis, if a received transmission is a valid interrogation signal and, if so, fully awakening and responding to the valid interrogation signal, via the transmitter, by at least transmitting the last stored measured parameter. view more

A system for measuring at least one tire parameter comprising: a tire tag disposed in a vehicle tire; a sensor forming a part of the tire tag and measuring at least one tire parameter on a first periodic basis; a microprocessor in the tire tag for causing communication between the tire tag and a remote source; a memory in the microprocessor for storing the at least one measured tire parameter; a transmitter/receiver forming a part of the tire tag for communicating with the remote source and transmitting at least the last stored tire parameter to the remote source under control of the microprocessor; the microprocessor causing the sensor to measure the at least one tire parameter independently of causing the transmitter/receiver to communication with the remote source; and the microprocessor periodically partially awakening to determine, on a second periodic basis, if a received transmission is a valid interrogation signal and, if so, fully awakening and responding to the valid interrogation signal. view more

The system of claim 1, wherein the device is a tire tag.

A tire tag comprising:</claim-text> a sensor for measuring at least one tire parameter and generating a data signal representing the measured parameter; a microprocessor for causing the tire tag to enter a deep sleep mode in which a minimum number of rical components are powered to conserve battery power; the microprocessor, on a periodic basis, causing the tire tag to enter a lucid sleep mode in which certain of the electrical components are activated to cause the sensor to measure and store the at least one tire parameter; and the microprocessor periodically partially awakening and looking for a forward link transmission and, if detected, causing the tire tag to determine whether the forward link transmission is a valid interrogation signal and, if so, causing the tire tag to enter an interrogation mode where the microprocessor activates all necessary electrical components to receive, process and respond to the valid interrogation signal. view more