MEC-P20EP 20-ZONE EMERGENCY ALARM MONITOR EXPANSION PANELMEC P20EP ABS EXPANSION PANEL The MEC P20EP Expansion Panel is designed to work in conjunction with the MEC P20MS or MEC P20MP main control units, extending the systems alarm monitoring capability. Each module provides real time status display for up to 20 zones, and when connected via RS 485 communication, up to four expansion panels can be cascaded to achieve a total monitoring capacity of 100 zones, offering a flexible configuration for projects of