A hardware interface commonly found on older PCs, usually with a 9-pin DE-9 socket/plug, on networking devices or servers also with RJ-45 socket/plug (otherwise commonly used for ethernet), or with a (much wider) 25-pin DB-25 socket/plug. Two common standards used with such an interface are RS-232 ...

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Monitor com port with strace

I have written a small application in Java that writes two strings – 'dddd' and 'ffff' – to a com port. I used strace -s9999 -o serialtrace.log -eread,write,ioctl to inspect how it writes. I found ...
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1answer
13 views

See a serial port as a MIDI IN device

I have connected a MIDI device to my UART RX / serial port /dev/ttyAMA0 using some electronics as described here. I have properly configured the right baud setting (31250 baud, etc.). It works: I can ...
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13 views

Transfer file to pc from embedded linux device via serial communications

I'm working on an AT91SAM9G20. I'm connected to AT91SAM9G20 via the debug port using rs232 serial communications. It has Linux version 3.4.8 but does not appear to have any of the common file ...
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2answers
2k views

How do I know if a serial port is actually transmitting data, without opening the device?

I have a high-availability cluster (Heartbeat) connected via serial line and two ethernet NICs. I'd like to set up a monitoring script capable of recognizing disconnected serial line (basically the ...
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1answer
23 views

What is a UART port

I have a .fex file for Cubietruck. Supposedly, the bluetooth pins are defined in the uart_para2. With the current config, I have uart0 and uart2 enabled, and everything else is disabled. Bluetooth ...
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0answers
53 views

cat /dev/ttyS0 Input/output error

I created infrared receiver as in LIRC manual (http://www.lirc.org/receivers.html). And tested it on windows using program called Terminal. When I switched on RTS pin DCD pin was also switched on ...
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6 views

Changing portname mount

I'm using a custom Cubietruck board. Currently, a serial port and a bluetooth port both get mounted to /dev/ttyS1, so i cannot enable both of them. How can I change the mounting drive to one maps to ...
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1answer
677 views

rs232 to usb not working

I also asked this question on AskUbuntu but there nobody comments on it I have a konig rs232 serial to usb adapter (no FTDI chip), but when I try to connect to a cisco switch/router (via Putty, ...
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1answer
1k views

Setting up tty ports on Beaglebone Black with Angstrom linux

I'm using a Beaglebone Black running the Angstrom v2012.12 build that came pre-loaded. I want to be able to connect another device to a serial port via the UART connections on the GPIO headers. The ...
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2answers
50 views

cat command in shell does not terminate on receving EOT through serial port

I have shell/perl script which kicks off cat commands to receive incoming serial data from n external device. The external device is designed to send to send a EOT character when it's done ...
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votes
5answers
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setserial /dev/ttyS4: Cannot set serial info

So, I have a board with 6 hardware serial ports: the first 2 on the ETX bus and the last 4 on the ISA bus. The following configuration is how it is supposed to be: /dev/ttyS0 port 0x03F8 irq 4 ...
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3answers
2k views

udev re-numbering when creating symlinks

I have USB cellular modem attached to an ALIX 3d2 board running voyage linux (which is based on Debian Squeeze). The modem registers itself as a TTY device, and so by default, udev will create TTY ...
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2answers
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udev rule for assigning known symlinks for identical usb serial devices

I have two (and possibly in the future, more) USB serial devices which are identical (down to the serial number, unfortunately) - they're actually BTC miners. Currently they end up as ttyUSBX where X ...
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vote
1answer
78 views

problem with U-boot while flashing Linux in sd-card

Please help as it is immense necessary for a project which is to be evaluated coming week. Also, I am very new to this and unable to find help from existing contents available on the Internet. While ...
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votes
1answer
1k views

How to send data from serial port over wifi?

I have microcontroller device which reads data from sensors and sends it via Serial to USB converter (ftdi232 cable). This Serial to USB converter is connected to ARMv7 mini-computer - CuBox with ...
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1answer
105 views

Serial Port I/O Error on Intel NUC with Debian Wheezy

I have a problem getting Serial Port working on INTEL NUC DE3815TYBE. I have Debian Wheezy installed with kernel 3.16.0-0.bpo.4-amd64. When I do: setserial -g /dev/ttyS* I get: /dev/ttyS0, UART: ...
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1answer
10k views

command to determine ports of a device (like /dev/ttyUSB0)

I have a question regarding the ports in Linux. If I connect my device via USB and want to check its port I cant do it using the command lsusb, which only specifies bus number and device number on ...
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1answer
553 views

Reading from serial port in the simplest way?

I have a TrueRNG USB-based hardware RNG, and I am trying to read its output on Mac OS X 10.9.2. I need just one-way communication. The device says that it appears as a "CDC Virtual Serial Port", and ...
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8answers
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How to connect to a serial port as simple as using SSH?

Is there a way to connect to a serial terminal just as you would do with SSH? There must be a simpler way than tools such as Minicom, like this $ serial /dev/ttyS0 I know I can cat the output ...
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1answer
79 views

CP2102 usb to serial error

I'm trying to flash the nodemcu fw for the esp8266 using a usb to serial adapter, it come mounted on /dev/ttyUSB0 but it can't communicate with the module. All the connection are ok, and I've also ...
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1answer
27 views

xbee serial module and minicom

When we connect a serial xbee module board to a Linux PC serially using RS232 9 pin cable, the data received on minicom screen is unreadable or sometimes no data is received at all. The setting is as ...
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0answers
114 views

Testing if HL-340 works

I have Kubuntu 14.10 development workstation and recently I have bought a pair of QinHeng Electronics HL-340 USB-Serial adapter via eBay. HL-340 is USB<---->Serial adapter and it is recognized by ...
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2answers
7k views

Send file by xmodem or kermit protocol with GNU screen

I work with an RS-232 device via GNU screen. $ screen /dev/ttyUSB0 115200 At some point I need to send a local file to the device using either the xmodem or kermit protocol. On Windows I use ...
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1answer
483 views

How to enable/disable a serial port?

I need to disable and then enable a serial port for testing purposes on a Java program. Since the man page of setserial is stating: "Using UART type none will disable the port.", I use sudo setserial ...
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1answer
74 views

What is the complementary command to 'rx' for xmodem transfer?

I have an installation of busybox on an embedded linux system that comes with a great little utility called rx: rx FILE Receive a file using the xmodem protocol This is perfect for transferring ...
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1answer
20 views

Mount.nfs is using a serial port

I export a folder to remote hosts by configuring the /etc/export file this way in the NFS server: /remoteFolder 172.22.0.0/255.255.0.0(ro,no_root_squash,sync,insecure) and start the NFS daemon with ...
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3answers
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Why do some Linux distributions still have /dev/ttyS0, ttyS1, etc., even though newer computers don't have such a serial port?

Many new laptop and desktop computers do not have 9-pin/25-pin serial ports. Why do many Linux distributions still contain /dev/ttyS0, dev/ttyS1 device files? Since udev can create the device files ...
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0answers
14 views

Unable to set node name using udev rules

I have a udev rule that has been working for years in Ubuntu versions up until now. I installed Kubuntu 14.04 and my rule no longer works. Actually, just the name assignment part no longer works. The ...
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votes
2answers
7k views

How to bind USB device under a static name?

I have an arduino which sometimes gets bound to /dev/ttyUSB0 and other times to /dev/ttyUSB1 making my script fail. I do not want to enumerate all the possibilities of where my device could be, but I ...
3
votes
1answer
24 views

termios settings after closing file

Are the settings altered by functions from termios.h kept after file is closed and open again? I want to use serial communication in a higher level language (Racket) which exposes only reading and ...
2
votes
2answers
2k views

debian does not detect serial PCI card after reboot

I have installed a PCI card with two serial and one parallel port on it. the chipset is MCS9865. I downloaded the latest driver(V1.0.12) from here. I ran make and make install. now the two serial ...
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3k views

Connecting to a serial port with VMWare ESXi and Ubuntu

Using VMWare ESXi 5.0.0, having a guest OS Ubuntu 12.04.3, upgraded to the date 05 january 2014. I've added "Serial port 1" to the Ubuntu 12.04 guest OS (let's call it "MyUbuntuPC"). Serial port 1 is ...
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1answer
34 views

terminate screen monitoring serial port

I'm using screen /dev/tty-MyDevice to look at traffic on my serial port. Pressing Ctrl+D doesn't cause the screen to terminate. How do I terminate it? Thanks
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0answers
83 views

how to use ser2net control port

man ser2net says that by running ser2net with a -p flag I can execute a number of commands. If I run ser2net -p 12345 and, then, lsof -i :12345, I can see the service on that port. How would I, for ...
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0answers
17 views

BIOS and CentOS sending serial messages on bootup

I have a piece of hardware connected to my CentOS workstation via serial. The hardware has to be always on and responding. Recently I realised that on rebooting, my BIOS sends out a serial message. ...
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0answers
42 views

Serial port locked by random process

I have an issue with trying to open a USB device's serial port with pyserial. It seems that as fast as I connect the device, /dev/ttyACM0 is used by some random process. ModemMana 851 root 8u ...
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0answers
46 views

Read from serial port with multiple terminals at the same time?

I am creating a Python script that will monitor a USB device for output. This script currently runs indefinitely so when I am running it I am not able to access the device from.. say a terminal. Is ...
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0answers
122 views

How to bind arduino as a fix block-device — /dev/ttyACM0?

I want to bind my Arduino Mega as /dev/ttyACM0. Sometimes, it turns out to be /dev/ttyACM0 and sometimes as /dev/ttyACM1. I have taken help from this question and this tutorial Someone please help ...
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votes
2answers
14k views

How to send AT commands to a modem in Linux?

In Linux (Ubuntu) I am trying to send AT commands to a modem at /dev/ttyACM0. I tried to do it as: sudo socat - /dev/ttyACM0 but when typing anything I just get a line repeating this command (I ...
3
votes
4answers
514 views

How do I configure my tty session such that a form feed `\f` character will clear the terminal?

I'm connecting to a USB-serial connection on /dev/ttyACM0. The code on the sender side is sending a \f character at regular intervals. print("----------------------------\n\r"); print("-- LED ...
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2answers
43 views

How do I find out if something is using the serial port?

I want to program a microcontroller under Debian Wheezy, but can't get it to work so far. I asked on Electrical Engineering and got the advice to check if something is already occupying the serial ...
3
votes
1answer
93 views

Viewing (monitoring) line status of a serial port

Is there a utility software (or an easy method to do it from shell script) to display a serial port's status — i. e. blinking “RXD”, “TXD”, “DCD”, “DTR”, “DSR”, “RTS”, “CTS”? Particularly, I need to ...
4
votes
1answer
56 views

UUCP on old Xenix with serial line no modem

A little question about UUCP on Xenix or other old Unix. I have set up UUCP as follow: Devices Direct tty2a - 9600 direct Systems xenix2 Any Direct tty2a 9600 12345 in:--in: user word: password ...
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0answers
66 views

Serial Terminal (Minicom) session does not start

The serial port ttyS0 is enabled. # setserial -a /dev/ttyS0 /dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4 Baud_base: 115200, close_delay: 50, divisor: 0 closing_wait: 3000 Flags: ...
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2answers
2k views

Attaching USB-Serial device with custom PID to ttyUSB0 on embedded

I'm attempting to get an FTDI USB-Serial device with a custom PID to automatically (or even manually) attach to ttyUSB%n, without much success. The device's normal VID/PID is 0403/6001. When ...
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35 views

basic serial communication

I've inserted a serial USB to TTL device to serially talk to my microcontroller when I inserted the device I got a file in dev directory named /dev/ttyUSB0. So now I want to communicate through it by ...
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0answers
137 views

SOCAT / MINICOM “No such device or address”

I'm no Linux guru, however I've done quite a lot of research on Socat and I simply cannot create a device that Minicom can see. In this case, port 10001 is the port that a Black Box Ethernet to ...
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1answer
353 views

Why `minicom` append the `0xOD` character to serial text message?

I have a serial device attached to my PC's usb port, and get /dev/ttyUSB0. Then I run minicom on it, and run strace -p <minicom pid> to monitor minicom's activity. I found that, when I send ...
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1answer
131 views

Starting Arduino IDE as root fails on Archlinux with KDE

I need to run the IDE as root to get access to the serial port. The command is ./arduino from inside the package folder. On Fedora this works fine, but on Archlinux the pocess chrashes with the ...
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0answers
166 views

How to suppress input overrun messages

I have a Raspberry Pi running Raspbian (a Debian flavor: Linux version 3.12-1-rpi (debian-kernel@lists.debian.org) (gcc version 4.7.2 (Debian 4.7.2-5+rpi1) ) #1 Debian 3.12.9-1+rpi1 (2014-05-19) ). ...