BB-USO9ML4 - Serial Converter, USB 2.0 to RS-422/485 DB9 Male, Isolated
The BB-USO9ML4 is a USB to one-port RS-422/485 converter that supports 2-wire RS-485 or 4-wire RS-422/485 communications. It is ideal for applications requiring long-range or multi-drop capabilities. Model USO9ML4 uses a DB9 connector on the RS-422/485 side. Two LEDs indicate data transmit or receive. The converter draws power from the USB port so no power supply is required. High retention USB port holds standard USB cables tight. Simply install the drivers supplied on CD ROM and plug the converter into an available USB port on your computer or USB hub. The device show ups as an additional COM port in the Windows Device Manager, and is compatible with Windows applications. One USB cable included. Universal Serial Bus (USB) – RS-485 Control No special software is required to control the RS-485 receiver or transmit line driver. The driver is automatically enabled during each byte transmitted in RS-485 mode. The transmitter is always enabled in RS-422 mode. The receiver is tri-stated during each byte transmitted in the echo-off mode. The receiver is always enabled in the echo-on mode. There are 4.7k Ohm pull-up/pull-down resistors on the RDA and RDB lines. A termination resistor may be added to R16 if needed. USB has become the connectivity workhorse of today’s PCs, replacing classic serial ports. But, many commercial and industrial devices still use RS-422/485 interfaces. To connect these devices to modern PCs, you need robust and reliable conversion solutions. USB ports are becoming more common on commercial and industrial equipment such as point-of-sale peripherals, medical devices, scientific instrumentation, laboratory equipment and other devices or in environments where surges, spikes and ground loops are likely to occur.