DU(4) Kernel Interfaces Manual DU(4)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.
DU(4)
Check Out this Related Man Page
Parity(3) User Contributed Perl Documentation Parity(3)NAME
String::Parity, setEvenParity, setOddParity, setSpaceParity, setMarkParity, isEvenParity, isOddParity isSpaceParity, isMarkParity, Even-
Bytes, OddBytes, SpaceBytes, MarkBytes, showParity, showMarkSpace - Parity (odd/even/mark/space) handling functions
SYNOPSIS
use String::Parity;
use String::Parity qw(:DEFAULT /show/);
DESCRIPTION
setEvenParity LIST
Copies the elements of LIST to a new list and converts the new elements to strings of bytes with even parity. In array context
returns the new list. In scalar context joins the elements of the new list into a single string and returns the string.
setOddParity LIST
Like setEvenParity function, but converts to strings with odd parity.
setSpaceParity LIST
Like setEvenParity function, but converts to strings with space (High bit cleared) parity.
setMarkParity LIST
Like setEvenParity function, but converts to strings with mark (High bit set) parity.
EvenBytes LIST
Returns the number of even parity bytes in the elements of LIST.
OddBytes LIST
Returns the number of odd parity bytes in the elements of LIST.
SpaceBytes LIST
Returns the number of space parity bytes in the elements of LIST.
MarkBytes LIST
Returns the number of mark parity bytes in the elements of LIST.
isEvenParity LIST
Returns TRUE if the LIST contains no byte with odd parity, FALSE otherwise.
isOddParity LIST
Returns TRUE if the LIST contains no byte with even parity, FALSE otherwise.
isSpaceParity LIST
Returns TRUE if the LIST contains no byte with mark parity, FALSE otherwise.
isMarkParity LIST
Returns TRUE if the LIST contains no byte with space parity, FALSE otherwise.
showParity LIST
Like setEvenParity function, but converts bytes with even parity to 'e' and other bytes to 'o'. The function showParity must be
imported by a specialised import list.
showMarkSpace LIST
Like setEvenParity function, but converts bytes with space parity to 's' and other bytes to 'm'. The function showMarkSpace must
be imported by a specialised import list.
NOTES
Don't use this module unless you have to communicate with some old device or protocol. Please make your application 8 bit clean and use the
internationally standardised ISO-8859-1 character set.
AUTHOR
Winfried Koenig <win@in.rhein-main.de>
SEE ALSO perl(1), Exporter(1)perl v5.8.0 1996-12-10 Parity(3)
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