• Linux Serial Port Commands
• Open Port Linux Command
• Linux Command Line Serial Port
• Php Serial Port Communication

• PHP Serial I somehow got hold of a « Citizen C2202-PD » point-of-sale display, and I wanted to play around with it. I also managed to get the documentation of it, and created a convenience class to access the serial port though the Linux file.
• This class can be used to communicate with a serial port under Linux or Windows. It takes the path (like '/dev/ttyS0' for linux or 'COM1' for windows) of serial device and checks whether it is valid before opening a connection to it. Once the connection is opened, it can send data to the serial port.
• Execute AT commands to send sms in php. I have a GSM modem attach to a serial port which I can access through 'putty' like in fig And I can enter AT commands to.

I have installed xampp in fedora 13.I am trying to communicate with microcontroller through serial port using php serial class. My code is example.php. Serial Programming/Serial Linux. The major number distinguishes a serial port, for example, from a keyboard driver, and is used to select the correct driver in. PHP by default does not offer good COM port support however a PHP extension called Direct IO does offers low level access to IO. We will use this extension for serial port communication. On unix system install the extension using PECL, open a terminal and type. I have installed xampp in fedora 13.I am trying to communicate with microcontroller through serial port using php serial class. My code is example.php.

I have installed xampp in fedora 13.I am trying to communicate with microcontroller through serial port using php serial class.My code is example.php

The php script gets executed but gives the following warnings .

Warning: Specified serial port is not valid in /opt/lampp/htdocs/xampp/php_serial.class.php on line 147Warning: Unable to set the baud rate : the device is either not set or opened in /opt/lampp/htdocs/xampp/php_serial.class.php on line 241Warning: Unable to set parity : the device is either not set or opened in /opt/lampp/htdocs/xampp/php_serial.class.php on line 295

.. I have used the command : chmod 0777 /dev/ttyUSB0 to give permissions . I have also tried to add the apache user 'prudhvi' to the dialout group by using command : $ usermod -a -G dialout prudhvi

But it doesnt work . When I send a command directly from the terminal using the command : echo 1 > /dev/ttyUSB0 it works and '1' is transmitted to the serial port . But using php I get the above warnings .

I have used the '$whoami' to check name of user and added that user 'prudhvi' to the dialout group . It still doesnt work . Please help me guys.

4 Answers

I did this once with Debian to control an Arduino board with a PHP script and initially ran into the same problem.

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In Debian, you need to add the Apache user to the dialout group in order to allow it to make serial connection requests. I would assume the same is true for Fedora.

In Debian the command is:

However I believe Fedora names the Apache user as apache instead. I don't have a Fedora machine to test on, but I would assume the command you need to run is:

You will then need to restart your xampp server.

See the following for reference:

Neal

nealio82

Linux Serial Port Commands

nealio82

Could you post the lines near / related to '/opt/lampp/htdocs/xampp/php_serial.class.php on line 147'?

Open Port Linux Command

I suspect that you are trying to set the device incorrectly (as Marc indicated). Either that or the port is already in use from other testing you are conducting at the same time. I'm not sure if the script you are running provides errors specific to ports you are trying to attach to already being in use.

First test a hello world type php script to testyour basic installation.

Then verify the web server / php engine is running as a user which is in a group allowed to access the applicable /dev/ttyWHATEVER device file corresponding to the serial port. It would be surprising if that were true by default - you'll probably have to add it to the 'dialout' or similar group.

Add some fault checking / reporting to your code. Install debian software on windows 8 hp.

Chris StrattonChris Stratton

Credit goes to Marc B's comment for causing me to look this up, and he's dead on: http://www.phpclasses.org/browse/file/17926.html

I believe that calling $serial->deviceSet('/dev/ttyUSB0'); will fix it, but you may have to modify the source of php_serial.class.php to work on /dev/ttyUSB instead of /dev/ttyS.

Linux Command Line Serial Port

Php Serial Port Communication

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