Nowadays, important criteria for selection of suitable back-up power supply, besides power, 
	back-up time and type of output energy, is also ability to monitor and to control this 
	back-up power supply by means of computer in consideration of its operation system.
	
	a) serial line (UPSMon for Windows only)
  
 
 
		
	a) Ethernet (one or more PC by SNMP adapter)