Questions tagged [serial-port]

The serial interface or serial port, also known as RS-232 is a communication port used to connect modems, mouses, some printers, scanners and other hardware equipment.

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How to install Drivers in Linux

I had fixed a new serial port to my workstation and following the instructions to install the driver for that card, the instructions says: <1>-copy pci60806a.o to /usr/sbin <2>-Add /usr/...
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Passing COM ports to Wine 5+ or rollback to old version of Wine

Xubuntu 20.04, I cannot get my ALDL (early OBDI) scan cable (USB to RS232 to ALDL) to work in wine. I can open "/dev/ttyUSBn" in linux com apps/virtualbox (winXP guest), receive data from ...
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zmodem crashing with large files over TCP

I'm attempting to send files to a Raspberry Pi Compute Module 3+ from a Windows 10 PC using a UART-WiFi bridge; the Pi is connected to the UART side, the PC connects to the bridge via WiFi. The bridge ...
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Redirect COM1 to /dev/ttyAMA0 in Java application

I want to use a Java application (*.jar file) on my Linux machine. I don't have the source code or anything like that. The application was developed on a Windows machine and needs a serial port. The ...
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If SMB can share serial ports, does that apply to USB Ports as well?

I was just taking a course and they said something I never heard of, that serial ports can be shared over SMB. That sounded kind of strange to me, but I guess I've never had a need to share a serial ...
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Serial port bad byte transfer rate?

Is there a threshold for an acceptable or not acceptable bad byte transfer rate over a serial port? Maybe a bad byte rate per baud? At what bad byte rate should you use flow control?
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socat resetting USB port on open

I'm having an issue with socat, and it is probably just in my environment. I need to have a USB serial port redirected to a TCP port. I use the following and it works perfectly: socat TCP-LISTEN:4444,...
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Putty cannot register anything i type in, serial connection issue

I'm having trouble using putty to set up a serial connection using my 16 port GSM modem. I am using the correct baud rate, data bits and stop bits for my modem. Just for reference I connected my GSM ...
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Packaging Node Serial Port app in MSIX

Are there any particular things to keep in mind when deploying apps that use USB/Serial communication within an MSIX package -primarily issues connected with the container nature of MSIX or ...
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Check if ECU is running (using PuTTY)

I have a portable ECU (electronic control unit) which I connect to my PC via PuTTY (serial protocol COM5, Baudrate 115200). I see that my ECU LED is flashing meaning that it is running. However, when ...
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Mirroring USB data to multiple computers/hosts simultaneously

I want to mirror the data sent to (and/or from) a USB device to multiple host computers at the same time (i.e no physical switches to select one host or the other). Here are two scenarios to describe ...
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Configuring Workstation For Serial Port Communication

I am trying to access the Siemens RuggedComm 900W ROS (operating system associated with the Ethernet switch) by establishing a serial port connection. I have followed the instructions described in the ...
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Is there a way to know which USB device file (/dev/ttyUSB0) is related to a particular interface (wwan0)

The title pretty much says it all, but here is my scenario in case it's relevant: I'm trying to automate bringing a USB modem online when it's first plugged in. With my hardware and cellular service, ...
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Bluetooth: automatic connect/reconnect and assignment of unique serial port in Raspbian (buster)

I need to connect a device (an amateur radio) to a Raspberry Pi (Buster) via Bluetooth for data transmission. I can do it successfully by selecting the Bluetooth icon on the Raspberry GUI, after which ...
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Serial Port shows 'busy' status when I try to read data from Serial port using 'screen' command in Ubuntu

I have written a code in java that writes data to serial port /dev/ttyS0. Now I am using screen command to read that data but it is showing port busy exception. following is my java code SerialPort ...
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How to fix strange usb serial problems in windows 10?

I have several issues with serial ports in windows 10. The first one is "ie_Open - device already open" in real term, but I also can't open the port in any program. Even uninstalling the ...
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How to route all Ethernet traffic to a Serial port on a Linux system?

How can I route all Ethernet traffic on a Linux system to a Serial port and the opposite? I want to convert from the first architecture to the second one, as shown in the picture: picture I monitored ...
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Different serial ports get the same COM identifier in Windows

We're using Windows 10 for testing several different devices, connected to several USB hubs. Some of these have the same VID/PID, some different. There are a lot of devices being plugged in and out, ...
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Windows 10: Two serial USB devices were given an identical port number

We are developing a desktop application under Windows 10 x64 v2004 to control virtual USB COM ports where the devices will be connected/disconnected several times during operation: While connecting ...
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Why does insmod of a driver generate a ttyF device?

I've recently had the case of compilating a driver for a PCIe to Serial Adapter. (more specifically, the AX99100 chipset on that card) For a quick test, I didn't really install the driver, but just ...
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Serial port incompatible with monitor

This question is similar to: Will a VGA monitor work if connected to 9-pin serial port? Can this workstation be used with modern serial monitors? The blue serial port has a box with "10101" ...
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Router power issues

I had to connect Comtrend WAP-5813n router physically to a laptop via USB-TTL cable, to make some changes in the router. By the time I took the device out of the plastic case, I noticed that LEDs ...
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225 views

What do IRQ, RTS, DTR & DSR mean here?

Got the below output on my linux. What do TX, RX, IRQ, RTS, DTR, DSR mean here in this context. I have read about Data Terminal Ready & Request to Send, but need help in understanding them in the ...
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Logilink RS232c USB-to-Serial converter software

I have a device with RS232 that works with a PCI board, however when I install a Logilink USB-to-Serial converter, I stop receiving data from my device. How do I resolve this? PCI Board configuration:...
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USB to COM for WIndows XP

Basically, I recently purchased a customer display for my EPOS till which runs on Windows XP (Yes I know XP Is old but it is running some legacy software). Anyways, in the Epson OPOS my display ...
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COM ports not refreshed after editing registry

I have a couple of FTDI devices that I need to change the COM port names of; following: https://www.ftdichip.com/Support/Documents/AppNotes/AN_132_Re-Assigning_COM_Port_Numbers_Using_Registry.pdf ...
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How to view logs in uboot?

I have a linux device running U-Boot and booting Ubuntu Core 18 that is having problems with its serial interface and networking. Because of these problems, I can't configure it via ssh or minicom. I ...
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Unable to change com port number of specific device

I am working on replacing a legacy machine with a new machine running windows 10. This machine has several COM ports and old software which is expecting certain COM port numbers for each device. I ...
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848 views

COM port in Windows 10

I understand that the COM port is a serial communication port inside a computer. But in my windows 10 laptop, I don't see any COM port connected. If I go to the control panel -> Device manager, I ...
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676 views

Bash read line from ttyUSB gives sometimes corrupted characters

I want to read line by line from external device (ttyUSB) over serial on my Ubuntu PC. I have following script: while true; do read line < /dev/ttyUSB0 echo $line done The problem is ...
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How Serial Port Loop Back Test work internally/underneath?

When doing a Serial Loopback Test on a USB Port (assume COM1) using Hyperterminal, you can verify that the test passed if what you type on the keyboard is displayed on the Terminal (although it's not ...
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Modern Intel CPUs serial communication

I have Intel X299 Chipset system that runs a linux system that prints boot log to the serial port, How can I connect to the serial port and read the data? modern motherboards doesn't have RS232 input. ...
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How to keep a device at a fixed Comport when removing and inserting

No serial I/O isn't dead :) The example I am going to use is a GPS device on a Windows computer. When you put a GPS locator on a computer it, as a rule, comes in to Device Manager as a COM Port. All ...
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STLink V2 VCP doesn't show up in Windows

I'm trying to get myself situated to program comfortably with my STM32 Blue Pill and STLink V2 USB interface. However, I've run into an issue when trying to gain access to the VCP (Virtual COM Port) ...
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How to share local PC com port to vps?

I have created an application that use a usb gsm modem. I want to try to run my application in my vps and connect it with the gsm modem in my local PC. My questions is: - How to share local PC com ...
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711 views

Using ZModem inside command-line on Windows for file transfer over Serial

I need to transfer large files from Windows to an embedded Linux system over Serial port. People seems to be recommending ZModem to do this task. Using TeraTerm's file transfer feature, I was able to ...
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349 views

How to force CentOS to keep showing log messages in serial console after system starts up

I am having this problem with CentOS sending me to the login prompt in serial console and not continuing on showing log messages. I did setup the serial console: I edited /etc/default/grub and ...
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multiple physical USB conectors, single COM port?

I want to run a bunch of arduinos off a single computer, but I want all the arduinos to be in the same COM port. I don't mean having all of them plugged into a USB hub, I mean each different arduino ...
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How to disable PuTTY to not sending CR at the end of the buffer? [duplicate]

When I send something through PuTTY serial port I receive what I've wrote and an extra character, including a CR. Is a problem because it hasn't happened until now that I've started to use this ...
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Mikrotik Serial Port Error “failure: port's channel is already in use”

Problem: When trying to change the settings on the MikroTik's (RB4011) serial port, the following error was received: "failure: port's channel is already in use" This error was received despite no ...
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Get data to go through USB to Serial Port of Digi One SP Device

Basic problem: I bought a "Digi One SP" device to attempt to connect a USB input to a TCP output. The Digi One SP has 3 ports: power, ethernet, and DB9 serial (Image 1). It also has a "Digi One SP ...
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1answer
183 views

Use USB port as serial comms to PC for STM32-NucleoF411 on Win10

I have a STM32 Nucleo-F411RE that I am using with WIN 10, 64 bit. I'm able to program it and everything OK. But I want to be able to use the usb port that I use for debugging so that I can just ...
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Virtualbox and Serial Port permissions for Windows10

I am using Windows10[HostOS]. I wanna create a virtual environment(windows7[GuestOS]) on Oracle VirtualBox(Ver5.2.18 r124319). However, I get the following error. How can I check this permission? [...
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Send AT commands via serial port using bash script on minimal linux

I need to init, with AT commands, a mobile modem without external libraries using only bash on minimal BusyBox. The mobile modem is on a serial port. It s working well with python but in case of ...
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Trying to read a serial port, device or resource busy

I'm trying to read the data from a GPS module. It uses TTL communication and I have an adapter to convert it to USB which is connected to my computer. I can get data from it using cgps, but I need to ...
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Sparkfun edge message communication error

Recently I posted this question in Stack Overflow. However, even after a bounty, nobody helped me. Although I know that cross-posting is discourage, I come with good intentions and I think that this ...
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virtual FTDI serial ports always busy after boot under MacOS Mojave

I am working with a lot of FTDI usb to serial chips integrated in various devices. I have to use the genuine FTDI driver as the newly integrated AppleFTDI Driver is less general and does not recognize ...
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Putty refuses to open serial ports and just dings

There's a windows 10 machine on which Putty refuses to open serial ports. There's no error message, just a "ding" then I click on Open. Any ideas on how to debug this? I have tried rebooting and ...
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Issues establishing a stable Minitel to Raspberry Pi serial port connection

I'm working on repurposing old Minitel into a dumb terminal. But I came across a problem with the serial port connection. As I found out, the serial connection from the Minitel to the Raspberry Pi ...
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Cannot get serial port working on linux (want to send AT command to an USB attached mobile phone)

I run Kali Linux (Debian based distro), and have minicom, socat, and atinout. I attached a Samsung Galaxy phone to USB and want to access it, using AT commands. When I run dmesg, I don't see any port, ...

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