I'm working through exactly the same issue as described by skaap2k. (11/04/07 12:01 AM, ID: 22503690)

1. Hyperterminal
2. Linux Serial Port Commands
3. Linux Serial Port Example

I have a linux server (Red Hat 4) with one serial port connection to an embedded linux device, and another serial port connection to a power controller for that device. I want to make sure my serial port driver is installed and configured the serial port or not. > Linux - Software: serial port communication. Linux Wiki; Distro.

Hyperterminal

I am using a Linux (Ubuntu) server and PHP as a web server. The solution offered appears to be for a command line version of PHP, and doesn't work in my web server.

Mar 02, 2004  Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter. 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. 5 Linux / Unix Commands For Connecting To The Serial Console last updated August 9, 2016 in Categories Command Line Hacks, Hardware, Networking M ost embedded Linux / BSD systems such as routers, servers and nas devices comes with console interface (serial port with RS-232).

In short, I need to read and write to a GSM modem via the serial port using php. Writing is working fine.
Reading using fread() of /dev/ttyS1 stalls the server until the required number of bytes set in fread() and a CR is received.
I need to return from checking the serial port with a null if there is no new data. I'm happy to pick a byte at a time from the serial buffer and assemble it into a string in php.
Any suggestions welcome!

I have a piece of simple code that works on a Windows - WAMP environment, e.g.

It connects via a USB cable (using USB-Serial drivers) to a circuit-board to light some LEDs, and it works fine - so similarly windows software like 232Analyser, can connect to COM3 and send code in DEC like 1,255,255,255,255,5, and light the LEDs. The number 255, is a DEC number from: 1,2,4,8,16,32,64,128,255 which will light a certain LED depending on which number is called.

Anyway, the code above works fine on Windows, and lights LEDs by calling this PHP file. So can call a URL like: http://localhost/lightled.php which works ok.

Now I need it to work via Linux, on a Raspberry Pi, so I have just installed standard Raspberry Linux, and Apache with PHP.

Then attached the USB cable, and it appears as /dev/ttyUSB0 I have then CHMOD 777 /dev/ttyUSB0

And changed the PHP code to:

However calling this file on Linux in a browser is not Lighting the LEDs, as it does on Windows.

Now when I call this file it goes through with no errors, without chmod 777, it gave a permission denied error. So it seems like it goes through ok, but something else is wrong.

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So question is anyone know how to make it work on Linux, it might be I am calling the USB wrong, or Raspberry Linux needs some kind of drivers, or ' `mode ' needs to be defined differently ..or maybe the decimal/binary code sent is not right like 'chr(2)' etc. needs to be different and wont be sent in same way on a LAMP setup.

Any ideas on what I can try?

Thanks.

Linux Serial Port Commands

1 Answer

There is no mode command in Linux.

Linux Serial Port Example

The closest equivalent is stty, but it doesn't take identical command-line arguments. You will need to perform some translation; read the manual page for stty for details.

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