... systemFeatures:1. Multi- loop HBUS bus communication technology, with automatic protection function, nonpolarity design, can effectively avoid damage ... data EEPROM, can store fault, alarm, on/off and event information by category.4. Reserved RS232 Micro printer ... ,XE3112SWL,XE3112H,XE3122,XE3123, XE3124,XE3125, XE3126Our system diagarm addressable electrical fire alarm system for mostly 512 points