NAME

iona − UnTerminal I/O network adapter serial driver

DESCRIPTION

The iona driver supports up to eight serial ports on two UnTerminal I/O network adapter (IONA) boards.  The ports can be programmed for speed (50-19200 baud), character length, and parity.  Output speed is always the same as input speed.  The ports behave as described in termio(7).

The asynchronous port is a character-at-a-time device for both input and output.  This characteristic both limits the bandwidth which can be achieved over a line, and increases the interrupt loading on the central processor.  In particular, file transfer programs such as uucp(1) may not function well at speeds over 9600 baud.

The baud rates of the serial adapter programmable baud-rate generator do not correspond exactly with system baud rates.  In particular, setting B0 will cause a disconnect, setting EXTA will set 19200 baud, and setting EXTB will set 38400 baud.  It is not possible to directly set 2000, 3600, or 7200 baud. 

Because of a current hardware limitation, the modem control bit will be disabled when the parallel printer interface is used on an IONA remote station (see iolp(7)).

Minor Device Numbers

The asynchronous port is a character device.  The low-order 4 bits (bits 0-3) of the minor device number correspond to the remote station at which the port is located.  Bit 4 enables modem control on the port. 

FILES

/dev/iona*

SEE ALSO

asy(7), iolp(7), termio(7), vna(7). 
signal(2) in the INTERACTIVE SDS Guide and Programmer’s Reference Manual.

ADDED VALUE

This entry, supplied by INTERACTIVE Systems Corporation, is an extension of UNIX System V. 

\*U  —  Version 1.0