The National Instruments AT-485/4 is a versatile serial interface device designed to facilitate communication between USB ports and serial ports through a reliable serial bus system. This device, part number 777311-04, operates with an external power supply of +12 VDC and is capable of achieving a standard baud rate of 460.8 kbps. The AT-485/4 features four asynchronous serial ports, leveraging RS-422 interface capabilities for enhanced communication functionality, while its robust drivers ensure optimal performance and efficient interruption handling across the ports.

Configured to support RTS/CTS handshaking, the AT-485/4 can serve as a standard serial port, ensuring compatibility with PC serial communications on Windows 2000 and 9x operating systems. The device employs advanced transceiver control modes for the RS-232/485 interface, and is equipped with LEDs for indication at the transmitter and receiver ports. With an ISA bus architecture, the AT-485/4 operates efficiently within a defined ambient temperature range of 0 to 70 °C, as specified by IEC-60068-2-1 and IEC-60068-2-2 standards. The device is housed with a DB-9 male connector for input/output functions. The AT-485/4 includes a two to three-year warranty and user manuals available for download, ensuring comprehensive support for operational and maintenance needs. For pricing information, please contact a sales representative directly.