The Industrial 12-Port USB to RS-232 adapter features to ensure 12 serial devices by DB-9 port connected require long range or multi-drop capabilities won’t be damaged between the PC and serial applications. Simply install the drivers, connect the 12-Port Serial adapter to your computer, plug in your serial devices, and you’re ready to go. Programming is not required, and you do not need to worry about IRQs, configuring aboard, power requirements (More...) The Industrial 12-Port USB to RS-232 adapter features to ensure 12 serial devices by DB-9 port connected require long range or multi-drop capabilities won’t be damaged between the PC and serial applications. Simply install the drivers, connect the 12-Port Serial adapter to your computer, plug in your serial devices, and you’re ready to go. Programming is not required, and you do not need to worry about IRQs, configuring aboard, power requirements, or connection schemes. Maximum 48 serial devices can be connected under cascading 4 units. Full compliance with the USB Specification 2.0 & 1.1 Compatible with all RS-232 protocols Supports transfer rate up to 230 kbps Supports USB branching up to 3 tire levels (max. 48 devices connection) Supports ±15kV (air), ±8kV (contact) ESD protection Supports 40A (5/50ns) & Peak Pulse Power 250 W (8/20 us) Surge and Transient spikes protection Compatible with Windows XP SP3 / Vista / 7 / 8 / 8.1, 10; Windows Server 2003 / 2008 / 2008R2 / 2012 / 2012R2, Mac OS 8.6, Linux 1.5.0 or higher Rugged & cambered metal shell and wall mountable