Php Serial Port Communication Linux Kernel

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[Solved] Using serial port. Using serial port (can't start communication). Mapped to the addresses the Linux kernel expects? I have installed xampp in fedora 13.I am trying to communicate with microcontroller through serial port using php serial class. Php serial communication in linux.

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I have a hardware project I'm building which needs to communicate with a host controller application running on a PC. I'm using a PIC microcontroller and an RS232 chip to drive the serial communications. My serial cable includes only 3 pins: Ground, RX and TX. When connecting this hardware to a serial port on my Windows PC which is using a multi-port serial card with an octopus cable, the communications are fine. When I connect the hardware to my Linux machine, I'm having problems. My Linux machine is using an ASUS M2NPV-VM motherboard with a 10-pin header on board for the serial port.

I then connected a common 10-pin header to DB9 connector to provide the DB9 serial port on the back of the machine. On the Linux machine, I'm running CentOS 7.3.1611 To talk to the board, I'm using Putty (in serial mode) on both computers. Although on the Linux machine, I've also tried minicom but that didn't help. First, I noticed the board was not getting any data from the host as well as the host was not getting anything from the board. If I reversed the RX and TX pins on the cable, then the board starting getting communications from the host, but the host is still not getting anything from the board.

I checked and double-checked the serial cable pin connections so I'm pretty sure they are correct (although backward from what was needed by the Windows PC). I also tried connecting an old external modem to the Linux serial port, but the modem uses a DB25 connector and I only have one cable - and I don't know if it is a null-modem cable (I haven't checked it yet - just tried it and it didn't work). This modem and cable do work when I connect them to my Windows PC. The serial port is enabled in the BIOS and dmesg shows that it is recognized.

Code: [ 1.102016] 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A I realize any of the following are possible: - The serial port on the motherboard is bad - The 10-pin header to DB-9 connector is bad - I thought this would be a longer list. I've ordered new 10-pin header to DB-9 connectors so I can try swapping that out. I've also ordered a plug-in serial port card, but I'm not sure if I'll be able to get the drivers required by the card built for my kernel (the driver source claims it support kernel versions 2.4 and 2.6 only - but I suspect it really means 2.6 and above and just needs some makefile twiddling). I plan to try building/installing the card this weekend. As for the on-board serial port, given that it will TX to the device but not RX, is there anything I can do to diagnose this?

I have got Arduino MEGA 2560. What I would like to do is to send a signal to Arduino via serial port to light specified LED up. However, I cannot find any documentation about this. What steps should I follow?

I think first, I need to compile the driver of Arduino and add it to Linux kernel. Second, I have to find some header files to use them in module. Then, I have to find functions to start serial communication and to light LEDs up. However, these are just my thoughts. Any advice will be appreciated.

I am trying to connect minicom to a serial device that is connected via a USB-to-serial adapter. This is a PL2303 and from everything I've read no additional drivers are required. The device is recognised as a PL2303. I'm a beginner at minicom. Is this the correct command to execute? Or do I need to configure something? $ sudo minicom --device /dev/ttyUSB0 minicom: cannot open /dev/ttyUSB0: No such file or directory $ sudo lsusb -v Bus 002 Device 006: ID 067b:2303 Prolific Technology, Inc.

PL2303 Serial Port Device Descriptor: bLength 18 bDescriptorType 1 $ tail /var/log/syslog #then removed and attached the device. Mar 13 23:31:49 ubuntu kernel: [805] usb 2-1: pl2303 converter now attached to ttyUSB0 Mar 13 23:34:44 ubuntu kernel: [829] usb 2-1: USB disconnect, address 7 Mar 13 23:34:44 ubuntu kernel: [821] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0 Mar 13 23:34:44 ubuntu kernel: [874] pl2303 2-1:1.0: device disconnected Mar 13 23:34:52 ubuntu kernel: [856] usb 2-1: new full speed USB device using uhci_hcd and address 8 Mar 13 23:34:52 ubuntu kernel: [845] pl2303 2-1:1.0: pl2303 converter detected Mar 13 23:34:52 ubuntu kernel: [809] usb 2-1: pl2303 converter now attached to ttyUSB0. I get get the same minicom error, 'cannot open /dev/ttyUSB0: No such file or directory' Three notes: • I get the error when the device attached to the serial port end of my Prolific Technology PL2303 USB/Serial adapter is turned off. After turning on the device (an embedded controller running Linux) minicom connected fine. • I have to run as super user (i.e. Sudo minicom) • Sometimes I have to unplug and plug back in the USB-to-serial adapter to get minicom to connect to it. I am running Ubuntu 10.04 LTS (Lucid Lynx) under VMware (running on Windows 7).