The MCX16-UZ I/O expander enables use of Clex (Uhlmann and amp; Zacher) wireless locks as access terminals in RACS 5 system. MCX16-UZ operates as hardware interface for communication of Clex locks with MC16 access controller. The expander communicates with the MC16 controller using RS485-1 bus and with Clex public online system using RS485-2 bus. MCX16-UZ offers its input and output lines for use in RACS 5 system.