The ne24.24M series is built around a 4x4 base unit that can be expanded with field-installable 4-channel input or output modules. The 12x4 Logic configuration is achieved by adding two 4-channel input cards and an optional General Purpose Output (GPO) Logic card to the base unit's expansion slots. The logic card provides programmable logic outputs to control external devices like projection screens, curtains, or lights based on presets or other defined logic. All programming and control are performed via a PC running Ashly's intuitive Protea NE Software, accessible over a standard 10/100 Ethernet or RS-232 connection. The unit is tamper-proof due to the absence of front-panel controls and multi-level software security.