The Software House input/output modules (I8, R8, and I8-CSI) provide a flexible, cost-effective means to expand the input and output functionality of any iSTAR or apC door controller. Common applications include alarm monitoring and control, and elevator control. The I8 input module provides eight Class A supervised inputs. Three LEDs per input help the installer commission and troubleshoot each input circuit. The R8 output module provides eight Form C dry contact relay outputs. A red status LED per output shows the state of the relay. The I8-CSI module enhances the functionality of the standard I8 module by supporting numerous supervised circuit types and EOL resistance values. This allows the I8-CSI to accommodate existing field wiring without changing EOL resistors. More than 20 different circuit types are supported.