The DSC-200/300 uses Quatech's new Enhanced Serial Adapter design. Legacy serial port data rates are limited to a maximum of 115,200 bits per second. Page 1 DSC-200/300 Two Channel RS-422/485 Asynchronous Communications Adapter for PCI bus User's Manual QUATECH, INC. TEL: (330) 655-9000 5675 View network card Quatech DSC-200/300 User Manual online or download in pfd format. View and Download Quatech DSC-200-300 instruction manual online. DSC-200/300. Two Channel RS-422/485 Asynchronous. Communications Adapter. for PCI bus. User's Manual. QUATECH, INC. TEL: (330) 655-9000. DSC-200/300 Two Channel RS-422/485 Asynchronous Communications Adapter for PCI bus User's Manual QUATECH, INC. 5675 Hudson Industrial Parkway Quatech DSC-200/300 - serial adapter overview and full product specs on CNET. Service & Support Details. Type. limited warranty. Full Contract Period.View and Download Quatech Asynchronous Communications Adapter DSC-200/300 user manual online. Two Channel RS-422/485 Asynchronous Page 1 DSC-200/300 Two Channel RS-422/485 Asynchronous Communications Adapter User's Manual QUATECH, INC. 5675 Hudson Industrial Parkway of 39. DSC-200/300. Two Channel RS-422/485 Asynchronous. Communications Adapter. for PCI bus. User's Manual. QUATECH, INC. TEL: (330) 655-9000.