When used with RTI accessory devices, each MPIO port can provide IR routing capabilities, one-way RS232 communication and power sensing. The ESC-2 allows installers to add two additional bi-directional serial ports and the RCM-4’s four relays can be used in a normally open or closed configuration for control over everything from window shades to screen lifts. Additionally, the PCM-4 and RCM-4 units can be powered by the included power supply or Power over Ethernet (PoE).