Advantechs adam 4561 allows serial devices to be connected to systems that use a usb interface connecting the adam 4561 to a pc is simple as you dont need to open the chassis or power down your pc instantly get one or two extra high speed rs 232422485 ports the adam 4561 is powered via the usb port so no external power supplies are needed this makes the adam 4561 suitable for modems printers pos systems and industrial control devices