UT-890, 600W Lightning Strike and Surge Protection, 1-port Serial USB Cable Converters

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UT-890, 600W Lightning Strike and Surge Protection, 1-port Serial USB Cable Converters

With rapid development of computer industry, USD is taking the place of various kinds of traditional low speed peripheral interfaces. However, RS-485/RS-422 interface designs are still used in many of the important facilities under current industrial environment. Therefore, converter is used by many users to implement the data transmission from USB of a computer to RS-485/RS-422 equipments.
    UT-890 is a universal USB/RS-485/422 converter, without external power supply needed. Compatible with USB, RS-422 and RS-485 standards, UT-890 is capable to perform the conversion from single-ended USB signal into balance differenced signal of RS-422 or RS-485. Quick state-of-the-art transient voltage suppressors (TVS) and discharge tube are adopted to protect the RS-422/RS-485 interfaces. Under normal conditions, the TVS tube is in the state of high resistance. However, when both ends of the TVS tube are hit by a transient high energy, the impedance at both ends can be depressed by the TVS at a very high speed, and after absorbing a high current, the voltage between the two ends is suppressed and kept at a pre-set value, therefore no damage is caused to the electrical components behind by the transient high voltage impact. The protector can effectively restrain lightning or ESD (electro static discharge) with a protection voltage of 600W on each line for lightning surge and surge voltage or transient over voltage possibly caused up by various reasons, and at the same time, a high-speed transmission of RS-422/RS-485 interfaces is ensured by the tiny capacitance between the poles. RJ-45 and DB9 male connectors are used for connection from RS-422 and RS-485 to other equipments. The unique I/O circuit of the internal zero delay auto transceiver contained in the converter controls the data stream direction automatically without any handshaking signal ( for example RTS, DTR etc.). The converter is plug-and-play without any jumper settings needed for mode shift between full duplex (RS-422) and half duplex (RS-485). All these features ensure a universal application on all the existing communication software and hardware interfaces.
    A reliable and stable point-to-point and point-to-multiport communication can be ensured by UT-890 photoelectric isolation interface converter. For point-to-multiport communication, as many as 32 interface facilities of RS-422 or RS-485 standard can be connected to each converter, and a high data transmission rate of 300-128000bps can be achieved. Power indicator light and data traffic indicator light are also available with the converter for malfunction indication. Conversions from USB to RS-422 and USB to RS-485 are supported.






Conforming to USBV1.1 and 1.0, EIA RS-485 and RS-422, backwards compatible

USB signals


RS-485 signals

T+, T-, GND

RS-422 signals

T+, T-, R+, R-, GND

Working modes

Asynchronous, point-to-point or point-to-multipoint, 2-line half duplex and 4-line full duplex.

Direction control

Adoption of automatic data stream control for automatic recognition and 

control of data transmission direction

Baud rate

300-128.000bps, automatic detection of the transmission rate of the serial interface signal.

Workload ability

Point-to-multiport supported, a maximum of 32 RS-422 or RS-485 interface equipments are supported

Transmission distance

1200 meters for RS-485/422 end (when 9,600bps) and a maximum of 5 meters for USB

Interface protection

600W lightning strike and surge protection and ±5KV electrostatic protection

Interface forms

A interface female connector, RJ-45 and DB9 male connectors for USB end

Signal indication

3 indicator lights for Power (PWR), Send (TXD) and receive (RXD)

Transmission media

twisted-pair cable or shielded cable

Transmission rate

128,000bps to 300M.

38,400bps to 600M.

9,600bps to 1200M



Working environment

-25  to 70, relative humidity 5% to 95%

Transmission distance

0-1200meters (128,000bps-9,600bps)

Supporting systems

Windows95/98/2000/XP/Vista/Win7/Linux and IMAG are supported


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Mr. Longzhi Liang (Sales Manager)
Tel: 86-755-27886063
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Contact Method
6 floor,C building,Jia An Industrial Zone,72# district of Bao An, Shenzhen, Guangdong, China (Mainland) / 518000
Fax: 86-755-27886083
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