Bộ Chuyển Đổi USB Sang RS-422/485 (UT-890)

 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 suppressor (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.

1.  USB 2.0;compliable USB1.0,1.1.
2.  RS-422/485 interface in DB PIN connector
3.  Design of automatic data (TXD) stream control and zero delay.
4.  Baud rate:>2M BPS.
5.  Automatic hand-shaking protocol supported.
6.  Remote wake-up and power supply management supported.
7.  +/-15KV ESD Protection.
8.  USB line powered
9.  Working environment: -25℃ to 70℃, relative humidity 5% to 95%.
10.  Windows95/98/2000/XP and NT-IMAG supported.

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