Questions tagged [serial-port]
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 or RS-422.
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Why error this code of GobiSerial?
this code of GobiSerial driver, however when I load and using dmesg to check => it show error sending startMessage
Why nResult error?
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Virtual COM port using only USB cable
I have seen that it is possible to connect two computers by USB cable and make a virtual ethernet bridge or something like that.
My question is, can we do something similar but configure the ...
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Why are serial ports losing bytes after Linux upgrade?
I have an embedded Linux system built using Yocto. Recently I upgraded from Dunfell (kernel 5.4) to Kirkstone (kernel 5.15) and I started having problems with the serial port. Large chunks of bytes ...
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ttyUSB ordering
I am working on a project involving the development of a device that interfaces with multiple ttyUSB ports, specifically 16 of them.
It's important to note that Linux handles ttyUSB ports differently ...
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How to patch kernel to reduce VTIME gap for uart termios API?
I need help to find a kernel patch to get a VTIME from tty termios API lower than 100ms, in order to decrease gap inter char. It blocks read syscall until VTIME timeout.
Function n_tty_read() is the ...
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How to read elm327 obd2 raw data over bt using rfcomm?
I am trying to read my car data, i have hooked a cheap elm327 bt obd2 connector to it, and using lubuntu.
Basically this is what i have done, but its not fully working i end up with a sort of buggy ...
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Pseudo terminal for comms between two processes
I am writing an executable that uses a 3rd party C library (libmodbus if it matters) to communicate via serial device (in my case, /dev/ttyUSB0 or similar to talk RS-485 via an FTDI chipset based USB-...
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Help opening USB serial link
My goal is to talk to an ARM mmc through a Segger serial link using this command:
python3 -m serial.tools.miniterm -e /dev/ttyUSB3 115200
However, I get the following error message:
No such file or ...
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Troubleshooting Communication Issue between Jetson Nano (Linux) and RS485-USB Converter in linux
I'm encountering a communication problem between my Jetson Nano (running Linux) and an RS485-USB converter. I'm seeking assistance in resolving this issue. Below are the details:
I'm using the ...
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I would like to find a way to match the output of lsusb to the /dev/ttyUSB* names
Faced with:
root@conserver01:/home/owen# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 1: ...
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Accessing two linux systems using one serial console port one at a time using splitter
I have two linux devices with serial console port. I have only one serial port on terminal server and i want to access both these devices one at a time basis. Can i hub/ splitter do the task if i ...
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Reset USB serial device as if it has been physically reconnected
I have computers set up, each with a single 3DR/Sik Radio (USB) connected to receive data from a single 3DR transmitter on another machine. When this computer with the transmitting device is rebooted, ...
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How to change the major and minor number of a device file?
I am currently working with an Embedded Linux Board and need to use the serial port, which is represented by the device file /dev/ttyS0. Upon running the command ls -l, I observed that the major and ...
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How to enable the second serial port on old vm AT&T SVR4?
Usually one serial port is sufficient to control via minicom the old SVR4 on Qemu (I know is a very old system, is unsafe, etc..).
I have set those two ports on configuration of vm
<serial type=&...
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Where are the hub and serial device drivers in Linux and have you ever seen a serial TTL adapter cut off data after some period of time
This question will be difficult to fully explain, I apologize in advance, but please read the entire description? Thank you.
NOTE: I'm primarily posted this to document it, and only asking for advice ...
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GRUB2 serial console issues on NVMe-based pc
I want to interact with GRUB through a usb-to-serial converter.
I was able to achieve this on my laptop by using this list of commands in grub's cli:
insmod nativedisk #to not loose drive information ...
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USB LTE modem without MAC address?
I'm connecting a linux machine using a nowadays popular Huawei Brovi E3372-325 LTE USB Stick to the internet. The special requirement is that incoming ssh/ping/NTP/... connections must reach my linux ...
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Configured Pymodbus baudrate different from /dev/ttySX
I am programming a modbus client to read a sensor. I have a code that works correctly on Windows (with multiple baudrates). However, when running it on Linux the baudrate is incorrect. I am using the ...
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In accessing console via serial connection, is there some "serial daemon" listening in the server?
When we use SSH, we should have an SSH client on the client computer and there should be an SSH server running on the remote computer. In Linux for example, the SSH daemon, sshd, should be running in ...
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Automatic time-stamping of virtual-com data
I am using a virtual serial port to import data from a microcontroller.
I want the data time stamped as soon as possible, preferably immediately upon recovering the packet.
Does Linux do this ...
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Need to redirect serial port snooping to network UDP socket
Good morning everyone,
I did a little bit of search, but could not really find an answer that would directly apply
I have an embedded device which is sending and receiving data over an RS485 ...
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Bluetooth device keeps disconnecting
I want to connect the bluetooth on my laptop to a device nearby offering SPP, and then talk to the device using a terminal program. It works great from Windows, now I'm trying to recreate that from ...
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Linux Mint: FTDI USB to Serial Adapter not working
Kernel: 5.15.0-41-generic x86_64 bits: 64 compiler: gcc v: 11.2.0 Desktop: Cinnamon 5.4.8 tk: GTK 3.24.33 wm: Moher dm: LightDM Distro: Linux Mint 21 Vanessa base: Ubuntu 22.04 jammy
I have a FTDI USB ...
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How to log binary data with GNU screen
I am using GNU screen to open a serial port and log incoming binary data to a file. The command I use is:
screen -S mySession -L -Logfile data_out /dev/ttyUSB0 115200, cs8
At some point the recording ...
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GTK app and serial port handlers
I’m writing a GTK C application for Linux OS on an embedded board.
The first main window opens a serial (virtual) port for receive the data from a bar-code reader.
I’m using standard open() function (...
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How use a USB (rather than a RS-232) port as a text terminal connection? I hope I am asking this correctly?
I have a Linux system that has USB ports, no RS-232 port. I would like to be able to plug in a USB cable into the Linux system and the other end of the USB cable into my PC, which happens to be ...
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Connect to Another system through serial port
I'm very new to Linux environment and need some help.
I have pc that runs on Ubuntu 22.04. I would like to connect to another system that has a specific IP address, through serial port. How can I ...
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Getting an SCSI scanner to work with a USB-to-serial adapter under Linux Kubuntu?
I hope that someone can help me get my old and beloved Heidelberg scanner to work under Linux Kubuntu -- or at least help me locate possible problems.
The situation is as follows: I have an old SCSI ...
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What's the difference between device properties and device attributes in udev?
For udev device entries, what is the technical difference between a "property" and an "attribute"? How are they customarily created (generated?) and used? Which one is the better ...
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Trying to add serial port devices to Centos 7-9 2009
I am trying to figure out a problem in which I am adding 3 more serial ports to the Centos distribution, so that it can talk to all of the serial ports on my embedded PC. Hopefully, someone can help ...
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RS-485 bus accessible from macOS, but not Raspbian
I've written an app that communicates with some devices via RS-485 (MODBUS). I wrote it on macOS and it works great from my Mac via an FTDI USB-485 adapter. But when I run the code on Raspbian, using ...
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Linux bluetooth device - configure as serial port
I have a particular sensor that communicates in the following manner:
IR - IR - FTDI UART - USB - Computer
This comes up as a serial port - /dev/ttyUSB0. That works fine.
The sensor also has an ...
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How can I poll a serial for input?
So I have a device than transmits integers at a set frame-rate (10 fps or something). It connects via a usb cable to my linux machine (ubuntu 20.04) where it is recognized as ttyACM0. I can cat this ...
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Intercept communications on physical serial port using socat
I'm no Linux expert so please go easy ;).
Ok, the situation is that I have a single board computer running Debian Wheezy. I know its old/risky etc etc but its not actually "my" equipment and ...
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Sending serial data to a USB port from the terminal?
I have an Arduino connected to my USB port (on my Linux based OS) at /dev/ttyACM0 which is listening for serial data to be read and processes them when received. All I need to do is send data to this ...
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Dumb terminal agetty keyboard layout filter
I recently acquired an old Heathkit dumb terminal, and I would like to get it working with the colemak keyboard layout. Because the terminal sends ascii codes directly over serial, I don't believe ...
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Serial port to COM port - no output found
I am using Ubuntu WSL1 in Windows. I want to find my serial port which is currently connected on COM4 and I am running this command:
dmesg | grep tty, dmesg | egrep tty, setserial commands, but ...
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CP210x / CC2652RB (slae.sh zigbee) serial missing on ubuntu 22.04
I'm using Ubuntu 22.04.
I just bought CC2652RB USB Zigbee (https://slae.sh/projects/cc2652/) but in my Ubuntu it doesn't create the /dev/serial folder.
This is the sudo lsusb -d 10c4:ea60 -v output
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PPS on focal/20.04 timed out and never recovers
we recently have upgraded to a new industry PC from Vecow/Plugin and to Ubuntu 20.04 from 18.04. From the BIOS (build date BIOS ~17.02.2022) and the IO chip according to it is a SuperIO 8786:
https://...
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Is there a difference in serial data formatting between Linux and Windows?
I am trying to read in serial data from an RS-485 RFID reader using a RS-485 to USB converter found here and a python script running Pyserial.
The issue I'm facing is that when I print out what is ...
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Split serial port into two virtual ports
This question is related to this post here:
Cloning/Splitting a serial port (COM) port in Ubuntu
I followed the steps to make the virtual ports but the problem is that I need full-duplex ...
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No login prompt from Getty over serial console
My Ubuntu 20.04 system has a serial port over which I would like to provide console access.
I can confirm that I can communicate over the serial port with
sudo picocom -b 115200 /dev/ttyS5
I start ...
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redirect TTY input to output without serial cable
I'm using simulation software for unix (ucsim) that runs two simulated programs that supposed to connect to each other via its own simulated serial ports.
The software provides me with these methods ...
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How to find the relation between a USB/TTL (dev/ttyUSB_) and it's GPIO pins (/dev/gpiochip_)
I have a number of USB/TTL adapters, based on CP2102N, which have four GPIO lines.
I can open one of the serial devices by /dev/ttyUSB0, and the related GPIO lines are controlled by libgpiod: /dev/...
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Application locked in the read() of a serial port device
OS Linaro on arm machine.
I'm writing a C console application that communicates with a USB device that exposes a virtual serial port profile.
Sometimes happens that the USB device is disconnected (and ...
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Serial UART Mode reverts to RS232 on boot
I'm using a Moxa Linux unit, Debian 9, and the port0 mode needs to be set to mode 1, 2 wire RS485. I use a startup script instigated via crontab which does work as the associated app restarts, but the ...
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Is there a way to ssh tunnel, and access a device in the /dev directory, and use it as if it is local? [duplicate]
Is there a way that one computer can share the a device in the /dev/ directory with another computer, and the other computer can interact with it is if it is local? Something analogous to an SSH ...
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Troubleshooting RS485 comm on Beaglebone black with cape comms2
TLDR: my serial comm (RS485) does not work on the BeagleBone Black. How to fix that?
——
Following my previous question which didn't find any solution, I am now exploring the linux side of the ...
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Trouble finding on-board serial port via UART: "-bash: echo: write error: Input/output error"
I have an old tv box that I wiped recently with Linux. I would like to connect a device to its onboard UART pins, to which I've soldered wires that connect to a UART adapter on my PC. I opened up a ...
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Using BRKINT With Pseudo-Terminals
$ screen
$ stty -ignbrk brkint
$ sleep 10
If I now press Ctrl-A+b to trigger a serial break, why is no SIGINT sent to the foreground process group sleep 10? Are serial breaks not implemented for ...
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