WitMotion USB-UART Converter 3-in-1 Multifunctional USB to TTL/ USB to RS232/ USB to RS485 3.3-5V Serial Adapter with CH340 chip Compatible with Windows 7,8,Linux,Arduino for Development Projects
StarTech.com 4 Port Serial Hub USB to RS232/RS485/RS422 Adapter - Industrial USB 2.0 to DB9 Serial Converter Hub - IP30 Rated - Din Rail Mountable Metal Serial Hub - 15kV ESD Protection (ICUSB234854I)
RUGGED & RELIABLE: This industrial metal USB to serial adapter hub adds 4 RS-232/422/485 ports & 1 USB 2.0 port w/ 15kV ESD surge protection (level 4), IP30 rating & locking connectors on all ports.
4 SERIAL PORTS: The ports on this USB to serial converter can be individually configured to RS232, RS422 or RS485 (2wire/4wire) at baud rates up to 921.6Kbps for devices like barcode scanners/printers.
MOUNTING OPTIONS: This metal mountable 4-port serial hub w/ 6ft (1.8 m) screw-lock USB cable incl. installs securely to a desk, wall or DIN rail using the built-in mounting ears & incl. DIN brackets.
FLEXIBLE POWER: This serial hub can be powered with either the 12V screw-locking power adapter or the 5V USB input, while each serial port (pin 9) can be set to 5V, 12V (power adapter required), or 0V.
WIDELY COMPATIBLE: To connect industrial grade equipment to any terminal, the USB to multiple DB9 male serial converter supports current and legacy Windows, Linux, macOS, as well as embedded platforms.
StarTech.com 4 Port USB to Serial RS232 Adapter - Wall Mount - Din Rail - COM Port Retention - FTDI USB to DB9 RS232 Hub (ICUSB2324I)
INDUSTRIAL STRENGTH: Built to withstand harsh environments, this 4 port USB to serial RS232 adapter has a rugged all-metal enclosure for added durability in industrial settings.
COM RETENTION CAPABILITIES: For added convenience, this FTDI USB to DB9 RS232 hub features COM retention so COM port assignments are maintained during reboots.
PLUG AND PLAY INSTALLATION: This DB9 serial converter is powered by an available USB port / cable so no external power adapter is required.
INSTALLATION OPTIONS: This USB serial adapter has integrated wall mount brackets and included DIN Rail clips for versatile mounting options.