I used some command like
I use PuTTy allot. I will try the raw mode. I do know that the pseudo terminal is in raw mode, maybe that's the ticket. Will write back when I try.
Quote:
Originally Posted by Corona688
What is this file? How do you create it?
I might try putty's serial device option in raw mode.
hi. Im trying to install a switch.
And the manual says i should type a command including a SerialPortDevicePath. which is the filepath to serial port used for connection.
However.. nothing about how to find this info.
Could anyone help me where to find this path?
thx
mr.T (6 Replies)
I have installed aix 5.2 on aix box through serial console connected to COM 1 . I even get a login prompt after the fresh installation . But as soon as i give a root & enter i again get a login prompt.i..e I am not able to logon after a fresh installation.
and even i configured IP configuration... (0 Replies)
I am trying to access DG-100 gps logger on Mac OS X with POSIX API. The device uses a Prolific usb-serial controller, and connect to the usb port on my mac.
After I install the Prolific driver, it shows up as /dev/tty.usbserial and /dev/cu.usbserial. The vendor has published the data format. So... (1 Reply)
Hey!
I'm trying to figure out a sollution for a problem I have at my company with an Iomega MiniMax 500 GB USB disk.
If i run cat /proc/bus/usb/devices
I get this information:
T: Bus=01 Lev=02 Prnt=04 Port=00 Cnt=01 Dev#= 5 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00... (2 Replies)
Hi community,
I've currently working on SUN Server V490 and I'm connecting with a Serial port (I DON'T HAVE ANY IP CONNECTIVITY)...I need to redirect the graphic interface of Oracle with the dbca command; I know a way with an IP Connectivity ( use a X-Server and then setenv DISPLAY... (7 Replies)
I have problem with C programming. I want to send & receive data through serial communication. I send data(command) to device to get data from device but when receive data, it can't get altogether of data.
It get only some data. What should I do to get altogether of data?
If all of... (7 Replies)
Hello all.
I have an old computer with M$-DOS 7. I want to use it like a dumb terminal, with telnet. I need to connect it to my desktop These are my questions:
How can i configure the serial port on dos?
How can i telnet form dos to the serial port?
How can i set up a telnet server on the... (12 Replies)
I am trying to change one of my serial printers from /dev/ttyr002 to /dev/ttyr014:
lpstat -s
device for check3: /dev/ttyr002
device for check4: /dev/ttyr002
I changed the tty setting for check3 in:
/etc/printcap
/var/spool/lp/admins/lp/printers/check3
to /dev/ttyr014
Then I get:... (4 Replies)
I'm new to Linux (Ubuntu 16.04), and very new to BASH scripting. I have a Numato 8-channel USB GPIO device, which is a DAQ that appears in the system as a serial port. In Linux it appears as ttyACM0. I can easily manipulate a GPO with, for example:
echo "gpio set 7" > /dev/ttyACM0
...followed... (12 Replies)
Discussion started by: Chalk-X
12 Replies
LEARN ABOUT PLAN9
raw
RAW(8) System Administration RAW(8)NAME
raw - bind a Linux raw character device
SYNOPSIS
raw /dev/raw/raw<N> <major> <minor>
raw /dev/raw/raw<N> /dev/<blockdev>
raw -q /dev/raw/raw<N>
raw -qa
DESCRIPTION
raw is used to bind a Linux raw character device to a block device. Any block device may be used: at the time of binding, the device
driver does not even have to be accessible (it may be loaded on demand as a kernel module later).
raw is used in two modes: it either sets raw device bindings, or it queries existing bindings. When setting a raw device, /dev/raw/raw<N>
is the device name of an existing raw device node in the filesystem. The block device to which it is to be bound can be specified either
in terms of its major and minor device numbers, or as a path name /dev/<blockdev> to an existing block device file.
The bindings already in existence can be queried with the -q option, which is used either with a raw device filename to query that one
device, or with the -a option to query all bound raw devices.
Unbinding can be done by specifying major and minor 0.
Once bound to a block device, a raw device can be opened, read and written, just like the block device it is bound to. However, the raw
device does not behave exactly like the block device. In particular, access to the raw device bypasses the kernel's block buffer cache
entirely: all I/O is done directly to and from the address space of the process performing the I/O. If the underlying block device driver
can support DMA, then no data copying at all is required to complete the I/O.
Because raw I/O involves direct hardware access to a process's memory, a few extra restrictions must be observed. All I/Os must be cor-
rectly aligned in memory and on disk: they must start at a sector offset on disk, they must be an exact number of sectors long, and the
data buffer in virtual memory must also be aligned to a multiple of the sector size. The sector size is 512 bytes for most devices.
OPTIONS -q, --query
Set query mode. raw will query an existing binding instead of setting a new one.
-a, --all
With -q , specify that all bound raw devices should be queried.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
BUGS
The Linux dd(1) command should be used without the bs= option, or the blocksize needs to be a multiple of the sector size of the device
(512 bytes usually), otherwise it will fail with "Invalid Argument" messages (EINVAL).
Raw I/O devices do not maintain cache coherency with the Linux block device buffer cache. If you use raw I/O to overwrite data already in
the buffer cache, the buffer cache will no longer correspond to the contents of the actual storage device underneath. This is deliberate,
but is regarded either a bug or a feature depending on who you ask!
NOTES
Rather than using raw devices applications should prefer open(2) devices, such as /dev/sda1, with the O_DIRECT flag.
AUTHOR
Stephen Tweedie (sct@redhat.com)
AVAILABILITY
The raw command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux August 1999 RAW(8)