Ubuntu :: Open The COM1 Port To Do Serial Communication Via PHP?
Mar 15, 2010
Not really sure where to post this, so here goes... I installed apache2, php and MySQL via LAMP and everything seems to work fine but when I try to open the COM1 port to do serial communication via PHP, I get a permission denied error.
I've also tried using /dev/ttyS0 instead of COM1: but no luck. Anyone out there know what I'm doing wrong? I don't know if I need to set something up in apache2 or php or if the code is just wrong. I'm on an Acer Aspire One with Ubuntu's LNR 9.10.
I am new to linux terminal programming and all but i want to set up a simple serial communication from my desktop through USB port. The actual idea to to write some data in the terminal and build a terminal program that sends the data to the usb port with a fixed baud rate. are there ready made terminal programs available for this simple communication?or atleast any Graphical tools which could help me build and design such a terminal in ubuntu 9.04?
I'm using C serial in a program to open and use a serial port but the port won't open for one reason or another. The program successfully runs on a different computer and when using RealTerm: Serial Capture Program, I can connect through the serial port with the same settings as I'm attempting through my c code. Anyone have any idea why it might be failing? I know this is still pretty vague, so let me know if there's other things I can tell you that might help to finding a solution
I am in verse to understand the serial communication between guest and host.I have just added a serial port through VI Client selecting "Use serial port on host"(host being ESX host).If I am on VM and run :
ll > /dev/ttyS0
I understand that it should get displayed through ESX Host. So On ESX Host, I typed:
Running RHEL5.5 on a Dell R710 server. I installed a 2-port PCIe serial card, built the driver, and installed the kernel module. The ports show up in /etc/hwconf, lspci, kudzu, /proc/ioports, etc., and I now have two new device entries...
/dev/ttyE0 /dev/ttyE1
When I connect a null modem cable from port 0 of the card in the new computer to serial 0 of another computer, I can receive text from the other computer. When I do this... code...
When I try to Sync a Palm Vx to my PC through serial port I get a communication error message in the gadget. My PalmOS Devices application is already configured to use tty0 or tty1 in unsuccessfully trials. I have a lot of information in the addresses, agenda, notes, etc. and do not want to loose that information gathered for years, nor to return to Windows.
As a test, I used a serial mouse in the serial port and It didn't work. I verified the Bios Setup and COM 1 and COM 2 are enabled.
I also checked my system serial support with the following commands:
And messages were OK when compared with typical outputs. My machine is a Pentium 4 CPU 1.6 GHz, in a U8668 motherboard (Award Software International). I have Ubuntu 10.04 LTS with Gnome.
I am new in Linux and don't know Bash yet. I had followed indications from Internet tutorials successfully, but I don't know how to proceed in this case.
I have been trying out serial and parallel data communication on Fedora 13 Beta. I can easily see the list of serial ports through:
Code: setserial -g /dev/ttyS[0-3] And can also write some data through: Code: ll > /dev/ttyS0 But I am unable to see parallel ports I can see something like: Code: /dev/parport0 But when I try out: ll > /dev/parport0 It throws error.
I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0
in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but
cat < /dev/ttyS0. just prints out weird characters from what I type.
We have a new machine with RedHat enterprise 5 on it. I need to connect a serial cable to the serial port and talk to another system (old alpha system) instead of using a VT connected to the alpha.Does RedHat come with anything like Keaterm/hyperterm/etc etc?
I'm trying to set rxtxSerial to work so a Java app has access to a serial port (via SiLabs CP210x driver, port /dev/ttyUSB0). When I use update-alternatives --config java, there are 3 alternatives which provide `java'. I have tried openJDK and Sun. Both fail but with completely different messages.
I was trying out the parallel port communication on RHEL 6 but found it not working: #echo hello > /dev/parport0 write error :Invalid argument". #ll > "/dev/lp0" /dev/lp0:No such device or address
I am writing some application in C, which will access a serial port device (RS232). My application is working good. But if any other application is already opened the port, I couldn't able to identify that. In windows VB program, while accessing comport through mscomm control, i am receiving an error as "Port Already Opened". But in Linux environment, through C program how can i get that? I am accessing comport 1 as follows
ive been looking through several online documents and forum posts but i cant get a clearcut answer on how to set up serial port acces in ubuntu 10.04 (server).
I'm writing a point-of-sale application in Perl/Tk, to run on Ubuntu. For cashier accounts, I plan to just use normal Linux accounts. Cashier login will be done by scanning a badge with a barcode ID on it. Our barcode scanners are older serial-port types. Thus, I'd like to login to the X (Gnome) desktop, yet read the username (and password) via a serial port such as /dev/ttyS0.
I am using a F232 USB to serial adapter for connecting my wireless modem to my laptop and I wrote a simple C code for reading data received by the modem transmitted by another modem installed on my target device.The problem is my code is simply giving 0.00000 (float data) output .When I use the same code with my desktop its running fine and I am getting relevant data.What may be the problem? I even changed the permission for my /dev/ttyUSB0 I am using Ubuntu 10.04 on both my laptop and desktop
below is my code
Code:
#include <stdlib.h> #include <math.h> #include <errno.h> /* Error number definitions */ #include <termios.h> /* POSIX terminal control definitions */
I am trying to use one serial port simultaniously for two different programs. I have a two programs that use GPS information that I would like to run at the same time. At this time only one program at a time can access a serial port. I have found a way to emulate this in Windows so that I can have both running, now I'm trying to do the same in Ubuntu. Is it possible? If yes, How? The GPS receiver is connected via a USB port.
I would like to listen to a virtual serialport (dev/ttyACM0). I heard you can this with the terminal in Linux. But how? Does anyone know some commands?
Can anyone one give me some pointers please, for talking to a serial port, if I use cutecom it always returns "could not open /dev /tty0 or 1 or 3 or 4, even tried ttys0 etc
I have two usb2serial adapters connected to my PC with a null modem (I am doing some testing to learn serial comm for a particular application). I am writing to /dev/ttyUSB0 a trying to read /dev/ttyUSB1. I have used screen (screen /dev/ttyUSB1 115200) and am able to see the characters being written. I am also able to read and write with Python with the following code
I can't communicate with and UPS (Eaton) via a serial port. The serial port is UP and have been tested under a Windows OS.I have set up the communication parameters and tried to establish a dialog with the UPS. Minicom is installed. Nothing appears ont the screen and the VT102 has an offline status. The OS is Red Hat Enterprise Linux 5 64bits.Is somebody have examples to debug the serial port ?
I need cause an interrupt on a serial port. If I put a single HIGH on the RX pin, will that cause one? I all ready use the 4 control lines for data.Hope I am making sense?
I want to implement the following scenario :-[workstation1] <--ETHERNET-->[device 1]<--SERIAL-->[device 2]<--ETHERNET-->[workstation2]In short, a LAN over Serial link (RS-232 for instance).If there is a utility that offers such functionality, kindly give me the name, i've googled a bit, and found ser2net, but that only works with TELNETing.. i want it work like a normal LAN like file-sharing n all but over Serial.If there is no such software, then obv i have to program myself. regarding which i have more questions
