Specific:Serial Protocol: RS485 or RS422Specification: USB 2.0 EIA or RS485 and RS422 standardChip: Max Rate: 921600bpsMax Distance (RS485 or 422 End): 984ft (300m) at 921600bps, 1968ft (600m) at 38400bps, 3937ft (1.2km) at 9600bps USB-bus powered, no external power needed.Automatic hand-shaking protocol supported.Item Length: 1.5 FeetImportant Note:The USB end must be connected to PC or . Other USB devices like digital camera, scanner and printer is not allowed.To avoid reflections on cables it is necessary to use appropriate termination resitors (120, 1 or 4W). do NOT connect the adapter to RS422 or RS485 device install the driver on your computer or .4 Kinds of Working Modes: AsynchronousPoint to point or four wires full duplex Point to multiple point or four wires full duplex Point to point or two wires half duplex Point to multiple point or two wires half duplex.Applications: automation systemDistributed control systemLED display equipmentPLC control and managementCNC managementSCADA(Supervisory control and data acquisition) treatment or medication automation automationCheck on work attendanceHuman management.Measuring instruments and monitoring systemData Process material: plasticColor as shownPackage Contents:1 x USB to Serial Converter Cord1 x RS422 RS485 Serial DB9 to Terminal Block AdapterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.