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DT-9028I is a universal industrial eight port RS485 hub with adaptive, a RS232/RS485 port, a RS485 hub designed specifically for RS485 transmission distance and large capacity serial communication network expansion. DTECH has a number of independent innovation of technology, including the built-in data collision protection control.
usb to rs232 FTDI cable
DT-5051 is usb 2.0 to RS232 Serial DB9 Adaptador Convertidor Adapter cable.
Active RS232 to RS485 RS422 converter
Compatible with the Recommended Standards of RS-232C, RS-422 and RS-485, UT-208 photoelectric isolation interface converter can convert the single-ended RS-232 signal into balance differenced RS-422 or RS-485 signal.
1 to 8 VGA Splitter
DT-7258 250MHZ VGA splitter is the perfect solution for anyone who needs to send one video signal to 8 displays.
RS232 to RS485 RS422 interface converter
DT-9028 is an industrial-grade optical isolation multifunctional converter with external power supply, it compatible with RS-232/RS-485/RS-422 standard.
fiber modem
DT-9077 fiber modem implements advanced optic transmission technology to extend signal transmission distance up to 120km on single-core fiber
USB to Fast Ethernet Controller
DT-5016 USB2.0 Male to RJ45 Female Ethernet Network LAN Cable Adapter 10/1000Mbps for Apple Mac Book, Lenovo, ThinkPad, Dell, Sony, Samsung, Acer, Asus etc brand laptop, Tablet PC which without RJ45 interface
USB to DB9 and DB25 Adapter
DT-5018 USB to Serial (DB9) and DB25 Cable is your fast solution to utilize the peripheral with serial port and DB25 port  in an easy-to-use environment such as plug-n-play and hot swap function.