uark —
Arkmicro Technologies ARK3116 based USB serial adapter
uark* at uhub?
ucom* at uark?
The uark driver supports Arkmicro Technologies ARK3116
  based serial adapters.
The following devices should work with the
    uark driver:
HL USB-RS232
HugePine USB-UART
KQ-U8A Data Cable
Skymaster USB to RS232
 
The uark device driver first appeared in
  OpenBSD 4.0 and was ported to NetBSD
  6.0.
The uark driver was written by Jonathan
  Gray ⟨jsg@openbsd.org⟩.
Setting hardware flow control is not currently supported. It is not yet known
  how to ask the hardware to send a break.