A DHU-11 provides 16 communication lines.
Normal I/O control parameters for individual lines are managed by
ioctl(2) calls. Individual DHU-11 lines may be configured to run at any of 13 speeds (50, 200 and 38400 baud are not available); the speed may be set via
getty(8) or
stty(1) or may be communicated by other programs which use
ioctl(2) such as
ifconfig(8), see
tty(4).
The DHU-11 driver normally uses input silos and delays receiver interrupts by 20 milliseconds rather than taking an interrupt on each input character.