This manual introduces the installation and use of the VISTA-20P alarm control communication host, including functions and installation parts, performance, functions, compatible devices, important installation information, main board installation and wiring, basic (hard-wired) areas, doubled areas, smoke detectors, 4219/4229 expansion modules, wireless receiver installation, installation of a 5800TM module, installation of transmitter (wireless detector), installation of arming/disarming buttons, connection of relay modules, main board triggers, telephone lines/telephone modules, long-distance wireless connection, AAV connection, programming overview, area programming part, output device programming part, function key programming part, descriptor programming part, creating timetable, system communication, host and center communication, report code format, Ademco Contact ID®, system operation, user password and other contents.