Model Selection : SMI XXX
SMI : Base Model
XXX : 24 : 24V DC Supply
48 : Wide Range : 18 to 72V DC
230 : 230V AC Supply. Range 90 to 260V AC
They are used for providing Isolation to RS232 Interfaces. With high degree of protection, it keeps the COM port of your equipment safe.
Model Selection : SMI XXX
SMI : Base Model
XXX : 24 : 24V DC Supply
48 : Wide Range : 18 to 72V DC
230 : 230V AC Supply. Range 90 to 260V AC