A method and apparatus for interfacing a plurality of gas measurement
systems, including a mainstream and a sidestream gas measurement system,
to a host system via an interface unit. The present invention also
pertains to a sidestream gas measurement system that output signals
emulating the signals output by a mainstream gas measurement system or
portion thereof, so that the sidestream gas measurement system can
seamlessly communicate with a host system configured to communicate with
a mainstream gas measurement system or a portion thereof.