NAME

du, dp − DU-11 201 data-phone interface

DESCRIPTION

The dp0 file is a 201 data-phone interface.  Read and write calls to dp0 are limited to a maximum of 512 bytes.  Each write call is sent as a single record.  Seven bits from each byte are written along with an eighth odd parity bit.  The sync must be user supplied.  Each read call returns characters received from a single record.  Seven bits are returned unaltered; the eighth bit is set if the byte was not received in odd parity.  A 10 second time out is set and a zero-byte record is returned if nothing is received in that time. 

FILES

/dev/dp0

SEE ALSO

dn(4)

BUGS

The name dp0 is a historical dreg. 

7th Edition