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Full Discussion: Setting serial port configuration
Operating Systems Linux Red Hat Setting serial port configuration Post 302953930 by Corona688 on Wednesday 2nd of September 2015 04:44:10 PM
Old 09-02-2015
There's is no such thing as 9 bit RS-232. The road is 8 bits wide, period; you can send 7 bit or 8 bit trucks down it but not 9.

Sometimes you see 8-bit with parity misused to send an extra bit instead of parity. It's a serious pain to communicate with these devices anywhere, the 9th bit ends up coming in as parity error or on a sideband of some sort. You'd use stty to set serial port settings on a Linux system, but there's no setting to make the 8 bit road 9 bits wide, as your computer uses 8-bit bytes, not 9-bit ones.

Your application is going to have to either be modified or read through a filter.

Linux can do slightly better than having to calculate parity for each byte and check if it's error or not to deduce the 9th bit, but only slightly. See mark/space parity for a full explanation.
Last edited by Corona688; 09-02-2015 at 05:52 PM..
 

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LEARN ABOUT HPUX

vxr5check

vxr5check(1M)															     vxr5check(1M)

NAME

       vxr5check - verify RAID-5 volume parity

SYNOPSIS

       /etc/vx/bin/vxr5check [-i | -v] [-g diskgroup] volume

DESCRIPTION

       The vxr5check utility compares the parity of each stripe of a RAID-5 volume specified by volume.  vxr5check reads the data for each stripe,
       generates the parity for this stripe, and compares this parity with the existing parity.

       vxr5check can be run against the entire RAID-5 volume, or incrementally on RAID-5 stripe boundaries, by specifying the -i option.

OPTIONS

       -g diskgroup
		 Specifies the Veritas Volume Manager (VxVM) disk group name for the RAID-5 volume name for verification.  If this option  is  not
		 specified, the default disk group is determined using the rules given in the vxdg(1M) manual page.

       -i	 Verifies the RAID-5 volume incrementally per stripes.	If a parity mismatch is found, that stripe location is displayed.

       -v	 Verbose output for the incremental vxr5check verification.  The verbose option outputs each stripe number that is being verified.

OUTPUT FORMAT

       In  verbose  mode and incremental mode, summary reports for each stripe of the RAID-5 volume are printed in output records.  If an error is
       returned for a stripe, then an error message and stripe number are displayed.  In non-verbose mode, if an error is returned, an error  mes-
       sage is displayed.

       If a parity mismatch error is determined on a stripe, vxr5check exits on that stripe and does not continue for the remaining stripes in the
       RAID-5 volume.

FILES

       /usr/lib/vxvm/bin/vxr5vrfy    The utility that vxr5check calls to perform RAID-5 parity verification operations for  the  specified  RAID-5
				     volume.

EXIT CODES

       The  vxr5check  utility exits with a non-zero status if the attempted operation fails.  A non-zero exit code is not a complete indicator of
       the problems encountered, but rather denotes the first condition that prevented further execution of the utility.

       See vxintro(1M) for a list of standard exit codes.

NOTES

       Do not run vxr5check on a volume that is in degraded mode.

SEE ALSO

       vxevac(1M), vxintro(1M), vxmend(1M), vxvol(1M)

VxVM 5.0.31.1							    24 Mar 2008 						     vxr5check(1M)
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