Abstract: A method and apparatus for storing interleaved synchronous and asynchronous data in a single data storage file is disclosed. Synchronous data and asynchronous data are stored in an interleaved order. Synchronous data is stored at regular periodic intervals and is stored within the data storage file in a data record having a constant sized data field. At least one data pattern is precluded from. use as synchronous data. Data associated with asynchronous events are stored in the data storage file in a data record starting with this precluded data pattern, and followed by a field indicating the asynchronous event type. The time interval from an event associated with the previously recorded data can be determined and optionally stored in a variable length time-interval data field. The size of the variable length time-interval data field is stored in a time-length data field.

Abstract: An interface system for interfacing a computer to a battery-powered sensor system is disclosed. The interface system includes first and second modules coupled between the computer and the battery-powered system. The interface system operates independent of the sensor system with respect to transmitting and receiving data to/from the computer and receiving sensor data, respectively, but cooperate when transferring data therebetween. One module of the interface system, which includes a microcomputer and memory, adapts data format in accordance with the timing and data format requirements of the computer and the battery-powered sensor system. The other module of the interface system enables the exchange of data between the battery-powered sensor system and the computer despite differing operating voltage ranges.