1 Mbps, External Adapter, USB 1.1 Interface, Cabling: Serial RS-422, Cable Connectivity
Keyspan USA-28X (USA28XG) Serial Adapter - The USB Twin Serial Adapter plugs into a USB port on your Mac. It provides two RS-422 mini-DIN8 ports for connection to serial devices. Each port supports data rates up to 1 Mbps.
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