DT-9000 is compatible with RS-232C,RS422, RS-485 standard.
DT-9003 is compatible with RS-232,RS422, RS-485 standard.
DT-5001A is 2.0 standard, full-speed, high speed, backward compatible.
DT-5026A is ordinary USB device without power supply can be used directly.
DT-5010 is usb 2.0 to RS232 Serial DB9 Adaptador Convertidor Adapter Converter
DT-9031 is a converter between the asynchronous serial port RS232/422/485 and Ethernet, which is an independent intelligent device with a CPU, an embedded OS and a complete TCP/IP protocol stack.