USB to 1 x RS232 adapter - get a COM port on the PC via the USB port. FTDI chip. With threaded bushing for COM cable

USB-C to serial RS232 adapter cable
USB type C male to 9-pin RS-232 male connector with thumb screws
Data transfer speed 1 Mbps+
Supports remote wake-up and power etc
1.5 meters

RS232 for USB printer adapter cable
connect USB printer to PC com port
automatic baud rate 
power supply included
DB9 female and USB B
Supply voltage: 5VDC 100mA
GDI printers (without own emulation) are not supported 
See list of supported printers under Downloads

CAN bus port on your computer via USB 1.1, 2.0 or 3.0 port
Powered from USB port
LED shows initialization and CAN bus status
Installs as a standard Windows COM port
CAN modes: Standard, Listen, Echo
Controlled using ASCII commands
API provided along with examples
Plug and play installation
CAN bus speed up to 1 Mbps
Supports CAN 2.0A and CAN 2.0B protocols
Drivers provided for Windows and Linux OS
Supports SocketCAN (slcan driver) since kernel 2.6.38+

Connect RS232/RS422/RS485 equipment to USB port
Baudrate up to 921,6 kbit/s
Select type of port by DIL switch
Supports Win7/8/10, MAC

Two 16550 High performance UART (RS232) serial channels
Occupies one PCI or PCIe bus slot
Low Profile PCI Form Factor
Includes Low Profile PCI & Regular size PCI two brackets
Both USB A type and USB pin header connector on board to host connection
One RS232 DB9M and one RS232 10pin RJ45 serial ports on board
Includes one 10pin RJ45 – DB9M Bridge cable for 2nd DB9M port
5VDC Power output from each DB9M Port for POS device use application
2 Jumpers Individually enable / disable 5VDC output for each DM9M Port
On Board Molex mini 4Pin Power connector for sufficient DB9M 5V bus power from PC power supply
Supports 32bit/64bit Windows 7, Vista, XP, 2000, ME, 98SE

Serial to USB converter with 1 x RS232/422/485 port

Respects +/- 11volt data signals

Galvanically isolated on the RSxxx output

Self-tuner Baud Rate

Automatic direction control

Powered from the USB port

USB connector: Type B

Supports USB 1.1, 2.0 and 3.0

COM port: terminal block