32 Zone IO board is design for Lift Interface and Mailbox Control. Each I/O board has 32 inputs for monitoring and 32 Outputs for Control. The output port is a dry contact output which could interface to any kind of alarm or electric lock. CT54 is used for Lift control up to 64 floor buttons control. CT56 is used for Mailbox Control with Sensor Monitoring and Locks Control. The IO board would be connected to the iMS-Panel via the RS485 bus. Each I/O board would be assigned to a unique address on the bus.