If there are RS232-to-USB adapters why are there no USB-to-RS232 serial adapters?

Answer:

RS-232 serial ports are far slower than USB ports. With very few exceptions, devices that use USB ports would be impractical to use on a serial port.

First answer by Idisjunction. Last edit by Idisjunction. Contributor trust: 805 [recommend contributor recommended]. Question popularity: 12 [recommend question].