The AIOM expander module is designed for use with ATRIUM access control and provides space for up to 20 inputs (via zone doubling) and 10 outputs. With a built-in power supply and RS485 communication bus which can be automatically detected, there is no risk of errors due to missing jumpers or DIP switches. The AIOM is simply auto-detected on the communication bus and instantly synchronised with the controller. You can connect the AIOM to the ATRIUM controller anywhere within a 1,220m (4000ft) range.