Amplicon USB232U - 1 Introduction; The Products Described in this Manual; Features of the Usb232 U;485 Ui Series of Data Communications Interfaces

USB232U/485Ui
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1 INTRODUCTION
The USB232 Universal (USB232U) and USB485 Universal isolated (USB485Ui) serial
communications interfaces are a range of USB peripherals that provide legacy RS232 or
RS485 serial communication interfaces to computers with USB support.
1.1 The Products Described in this Manual
There are two variants of USB232U/485Ui. Each supports a single serial communications
interface that appears to operating system as a standard serial port.
USB232U A non-isolated RS232 interface.
USB485Ui An isolated RS485 interface.
1.2 Features of the USB232U/485Ui Series of Data Communications Interfaces
Each of the USB232U/485Ui series of interfaces is designed to meet stringent performance
requirements and ease of use while maintaining compatibility with standard serial
communications products.
• USB 1.1 specification compliant
• Windows 98, 2000, XP and Linux compatible
• Data rates selectable up to 1 M Baud (RS232) and 3 M Baud (RS485)
• FIFO modes supporting a 384 character receive buffer and 128 byte transmit buffers
• Three point isolated serial communications on isolated versions
• Full Duplex, Half Duplex, Multi-drop applications
• RS485 transmitter can be enabled automatically in Half Duplex mode
• Full specification signal levels
• Implementation of all RS232 primary control lines
• Low power consumption