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USBA4ET - USB to RS485 Bidirectional Serial Converter


Product Description

USBA4: USB to RS485 Bidirectional 2 Wire Half Duplex Serial Converter

  • This auto transmit unit features RS232 to RS422 bidirectional 4 wire full duplex  conversion with an intermediate CMOS/TTL tap point.
  • This auto transmit unit features bi-directional serial conversion from USB to RS485 in 2 wire half-duplex communications mode.

  • Optimized for non-isolated office/indoor point to point or multi-drop systems.

  • Transparent to all asynchronous data, with any combination of data, parity, and stop bits, at data rates up to 230.4 Kbps. No Jumpers or settings required.

  • Fast auto turn-around, from transmit to receive mode, requires no software delays and eliminates timing problems and data collisions. A special jumper(J5) can further shorten the turn-around time to accommodate fast responding target devices. We pioneered and perfected this leading edge technology.

  • The RS485 driver, with built in electro-static protection, allows 32 standard loads at 4000 ft. at data rates up to 230.4 Kbps.  

  • Jumpers permit the RS485 termination and bias resistors to be user configured. Jumper J4 will place the unit in Loop-Back mode for self test.

  • Edge mounted LEDs display power and data activity at the RS485 interface.

  • Broad environmental range. Temperature: 0C to +70C(32F to +158F). Humidity: 10 to 90% RH(non-condensing)

  • Four(4) easy mount through hole standoffs, which accept #6 hardware, are provided on the circuit board.

  • User connections are a USB type B receptacle, and a 3 position removable screw terminal strip for the RS485 port. There is no external power connector. Device power is obtained through the USB port.

  • The required "Virtual Com Port" USB driver, for the host computer, is available from under "Drivers". This web site provides drivers for most host operating systems. Some OS's will automatically search for, find, and install the appropriate software/driver.

  • Accessories available are an enclosure, and a USB cable(6 ft USB type A plug to USB type B plug).

  • Conformal Coating, cable, and connectors, are factory options. Contact us for options help.

  • R E Smith Inc makes a wide variety of isolated converters that address the electrical noise problems that contribute to unreliable communications, and product failure.  If what you see here is not exactly what you need, don't hesitate in calling us at 513-874-4796.

  • We also have a new series of Converters and Repeaters that extend the RS485 communications distance far beyond conventional limits. Contact us for information on these leading edge problem solvers.

  • WARNING: Do NOT connect this device to a telephone system under any circumstances. Damage could result to the circuit board and/or your telephone system. The RS422 drivers allow 32 single unit loads at 4000 ft. and data   rates up to 115.2 Kbps on the port.

Click here for more information about the USBA4ET USB to RS485 Bidirectional 2 Wire Half Duplex Serial Converter!
Questions? Please Call: 513 874-4796


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