Sponsored Content
Operating Systems Linux Debian Reading data from a serial port Post 302920063 by wisecracker on Tuesday 7th of October 2014 02:56:39 AM
Old 10-07-2014
What do you mean how?

If the value being read from the serial port is 0, (zero), then the cursor will not move.
Until the value changes from 33 to 126 you will not see anything printed but the cursor __might__ move by one space.

What is connected to the serial port, /dev/ttyS0?
Does it allow raw transfer? (e.g. Arduino.)

If nothing is connected then obtain a loopback plug as a test piece and plug it into the port.

Once set up and with a loopback plug connected use this untested line:-
Code:
printf "Some text to display" > /dev/ttyS0

 

9 More Discussions You Might Find Interesting

1. Programming

Reading incoming data in serial ports

Hi every body, i have the following problem : I need to read incoming data from a serial port, this port has connected a weigth device to it that send the weigth and i need to read this data to my aplication, i had this problem in Window Enviroment and i resolve with a "C" routine, but in Unix... (1 Reply)
Discussion started by: jricardorm
1 Replies

2. Programming

serial port reading

Hai there, Can any one provide me with a ansi c source code for opening com1 or com2 and read data. The port is connected to another serial communication device on rs232 port. The o/s is Sco Unix 5.0.6 Matter urgent Viswanath (0 Replies)
Discussion started by: viswanath
0 Replies

3. SCO

data transfer from serial port

dear sir, pls. can you help me ? , my os is unix sco 5.0.4 and ,server dat derive (1,4gb) not working, now i want to transfer my server data in other machine (unix/other possible) by serial port/other port comminication. thanks pankaj raval (2 Replies)
Discussion started by: pankajbraval
2 Replies

4. Solaris

Serial port on the T5140

What is the serial port on the T5140 used for. (4 Replies)
Discussion started by: pgsanders
4 Replies

5. Shell Programming and Scripting

Need help with serial port

Hi, I have a external board connected to my serial port. I need to execute "shutdown -r now" command when system boot up. When system boots up it requires a username ans password. Then I need to run my command. I can use rc script but that is rebooting system before it asks for username and... (0 Replies)
Discussion started by: charlie.arya
0 Replies

6. Solaris

How to enable Serial port on ILOM, when Network Port is enabled in parallel

Hi Everyone, In my environment, I have few T5220. On the iLOM Management Card, I have both Network and Serial port are cabled, I don't have any issues while I try to connect using Network Management port, but when I try to connect the serial port for the same server which is actually connected... (3 Replies)
Discussion started by: bobby320
3 Replies

7. Shell Programming and Scripting

reading from and writing to serial port

hello all, please any one can provide me the shell script to write data to /dev/ttyS1 and read responce from /dev/ttyS1 and compare the responce to some string .. thnxx ---------- Post updated at 03:35 PM ---------- Previous update was at 11:46 AM ---------- any body help me.. how do i... (1 Reply)
Discussion started by: yashwantkumar
1 Replies

8. Programming

Wrong data with Read from a serial port.

hi, I've a problem on my C/C++ program with Posix Library. I have to read data from the serial but I have incorrect data, in fact I get a bunch of zeros: "2953.3174, 2785.2126, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0 , 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ,... (24 Replies)
Discussion started by: enaud
24 Replies

9. Solaris

Cabling and adapters to communicate to service processor serial port from Windows PC with USB port.

Hello, I have an unloaded T5140 machine and want to access the ILOM for the first time and subsequently the network port after that., and then load Solaris 10 the final January 2011 build. The first part is what confuses me -the cabling. I am coming from a Windows machine (w/appropriate... (5 Replies)
Discussion started by: joboy
5 Replies
READER.CONF(5)							    PC/SC Lite							    READER.CONF(5)

NAME
reader.conf - configuration file for pcscd readers' drivers DESCRIPTION
The /etc/reader.conf.d/reader.conf file contains configuration information for serial and (some) PCMCIA smart card readers. USB readers SHALL NOT be configured using this file. pcscd uses another mechanism to automatically load USB drivers. SYNTAX
The /etc/reader.conf.d/reader.conf is a regular text file. Each reader must be defined by four fields: FRIENDLYNAME TEXT_STRING DEVICENAME FILENAME LIBPATH FILENAME CHANNELID NUMBER The "FRIENDLYNAME" field is an arbitrary text used to identify the reader. This text is displayed by commands like pcsc_scan(1) that prints the names of all the connected and detected readers. The "DEVICENAME" field was not used for old drivers (using the IFD handler version 2.0 or earlier). It is now (IFD handler version 3.0) used to identify the physical port on which the reader is connected. This is the device name of this port. It is dependent of the OS ker- nel. The first serial port device is called /dev/ttyS0 under Linux and /dev/cuaa0 under FreeBSD. The "LIBPATH" field is the filename of the driver code. The driver is a dynamically loaded piece of code (generally a drivername.so*file). The "CHANNELID" is no more used for recent drivers (IFD handler 3.0) and has been superseded by "DEVICENAME". If you have an old driver this field is used to indicate the port to use. You should read your driver documentation to know what information is needed here. It should be the serial port number for a serial reader. EXAMPLE
# Gemplus GemPCTwin reader with serial communication # connected to the first serial port FRIENDLYNAME "GemPCTwin serial" DEVICENAME /dev/ttyS0 LIBPATH /usr/lib64/pcsc/drivers/serial/libccidtwin.so.0.4.1 CHANNELID 1 DEBUGGING
In order to set up your /etc/reader.conf.d/reader.conf file correctly you may want to have debug messages from pcscd. I recommend you to start pscsd in the foreground and debug mode using: # pcscd --foreground --debug If everything seems OK you can use the pcsc_scan command to print the list of correctly detected readers and try to get the ATR of your smart cards. AUTHOR
Ludovic Rousseau <ludovic.rousseau@free.fr> SEE ALSO
pcscd(8), pcsc_scan(1) Muscle August 2005 READER.CONF(5)
All times are GMT -4. The time now is 04:56 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy