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Questions tagged [com]

A com port is a common name to refer to a serial interface on an IBM compatible PC. (Either virtual or physical)

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Can't connect to COM with hlk-rm04

I try to connect to hlk-rm04 (wi-fi adapter for COM port), but I catch error of timeout connection, everytime. I guess it a happens for a reason bad config for a COM port. Where can I looking for a ...
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35 views

Writing on Serial COM Port through CMD - Permission Denied?

I am trying to flash the Micropython Firmware on my ESP32 via USB via the CMD (admin mode) on Windows 8. This is what im getting: C:\Users\Administrator\Downloads>esptool.py --port COM3 --baud ...
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9 views

What logging options can I specify for VBoxSVC.exe with VirtualBox release builds?

I'm experiencing consistent program initialization failures with VirtualBox 5.x and the new 6.0 builds (OpenSourceEdition) on Windows 7 64bit, and after a whole week of trying it seems the only way to ...
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39 views

USB Smart Card Reader to COM Port

I'm facing the following problem: I have a software that reads/writes Smart Cards through COM Ports. The Smart Card device that i own is plugged through USB therefore recognised as a usb device with ...
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39 views

How to change number of COM port in a command line?

Is there away to change number of COM port in a command line? I have many many devices and for each device Windows assigns different port number (and remembers this number!). But in my case only one ...
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1answer
31 views

difference between COM port DeviceManager data and mode command in Windows

Why Windows mode command (mode COMX) is showing different data then same COMX has in Windows "DeviceManager", under Ports/Properties. Are these supposed to be in sync? See COM port via command line . ...
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1answer
127 views

How to connect one barcode scanner to multiple machines using USB & serial interfaces

Is it is possible to connect one barcode scanner to two machines to receive the same signal at the same time? In this case, either: barcode scanner to USB and serial port, or barcode scanner to USB ...
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1answer
2k views

Finding COM ports in Windows 10 [closed]

This question is similar to How to check Com ports in Windows 10 I have run the device manager in administrator mode, and "show hidden devices" is checked. "Ports (COM & LPT)" still doesn't appear....
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1answer
254 views

Linux virtual tty

I created my own Long Range RF USB. [USB device] -> [Raspberry PI] -> [myTxApp] -> [RF device *(not WiFi)] -> [RF device] -> [Laptop] -> [myRxApp] -> [Virtual device] I tested it on USB Webcam, and ...
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61 views

Why is the rate my USB COM port reads data dependent on the laptop being plugged in?

Summary I am reading serial data through a USB port and when the laptop is charging the COM Port receives about 60 updates per second and when the laptop is not charging the COM Port receives about 1 ...
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1answer
363 views

Printing via COM port using USB port

I have a software that only prints on a COM port. I have only USB ports available. I tried this solution How to map a virtual COM port to a physical USB port? but the NET USE COM66: \\name\printer /...
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1answer
39 views

how to connect two Windows computers by USB for communication between their virtual serial ports?

What is needed for the physical USB connection between two Windows computers for communication between their virtual serial ports? Should I use USB/serial adapters? I am building a .NET terminal app ...
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150 views

How to check if a Serial (COM) port works

We have a Serial device here connected to the one and only COM port on the computer. The COM port is part of the motherboard (not an PCIe expansion card). In Windows Device Manager this com port shows ...
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53 views

Connect Windows PC to remote Linux serial port

I have a remote Linux(Ubuntu) server with embedded device connected to the server's serial port. I have a Windows program to manage that embedded device. Is any way to share server's serial port via ...
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1answer
373 views

How to fix Code 19 Device Status for COM ports under Windows 10 (aside from system restore)

I have two Dell computers running Windows 10 with COM ports on the motherboard (not a USB to serial converter). The COM ports worked on both until, on separate days, after a reboot, they both showed ...
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47 views

Connecting two PCs with laplink cable without additional SW on one of them

I have an old laptop running Windows 95, a quite clean installation. Its floppy drive recently died and since it has no CD drive, ethernet or USB, I am almost out of options how to get data into it. ...
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1answer
124 views

Sending keystrokes through COM port without hardware

I'm running a piece of Software on Windows 7 (64 bit) that takes keyboard input through a COM port. I never had any of those, so what I used so far is an external PS2 to COM keyboard converter (...
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1answer
283 views

Assigning virtual com port to physical com port

Okay quick break down of my situation, I have a virtual com port (COM5) that has data being passed to it remotely, I essentially just need the virtual port to mirror a physical port (COM4). So ...
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1answer
293 views

Serial connection recieving continuous junk

I am trying to connect over a serial port to an HP AM867A switch (more broadly it is a Brocade 8gb SAN switch). I got the switch used so I am trying to perform password resets. The switch is running ...
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2answers
705 views

Linux: connecting to a USB virtual com port without root access?

I am trying to connect a microcontroller to a host computer using a USB virtual com port. However, I do not have root privileges on the host computer. The controller shows up as /dev/ttyACM0. When I ...
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1answer
827 views

windows 7 - reading serial port parameters

Let's assume that I run a program which reads/writes to a serial port (com). I known that the program uses baud rate 19200 and dynamically sets parity bit (mark parity or space parity). Device manager ...
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1answer
6k views

Windows 7 cannot find previously installed STM32 Virtual COM Port Driver

I have an STM32F4 Discovery board with a firmware that implements a USB CDC device. When connected I should see a virtual COM port device in the Window's Device Manager. I have installed the STM32 ...
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958 views

Only one COM Port Available

I have a Dell Optiplex 7020 running Windows 10 with one physical serial port. I checked the device manager and found that it only detects one COM port (COM1), while in other machine running windows XP/...
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90 views

Can a RS-232 COM port damage the motherboard's SATA controller?

We have a chromatograph connected to a computer through one of those old COM ports (RS-232 serial port). That COM port is onboard, connected directly to the motherboard's logic. The motherboard has 4 ...
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1answer
2k views

Find the com port of a specific device on command prompt

I know we can find it out from the device Manager under ports. But I want to be able to get this info on command line so I can incorporate it in my python script. I looked at tools like WMI, Devcon. ...
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2answers
3k views

Connect LPT printer to serial port

I have a printer with LPT port and it needs to be connected to serial COM1 port via adapter. Printer output is being rerouted to serial port COM1 with a command: mode LPT1=COM1 mode COM1: 9600,n,8,1 ...
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762 views

How to determine what is occupying a COM port

The Device Manager image below shows that devices occupy COM ports 4, 5, 6, and 7. Attempts to move the device from 7 to 13 failed because 13 was allegedly occupied. Reboot did not resolve this ...
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2answers
202k views

How to check COM ports in Windows 10?

Just like we can check COM ports in windows 7 or lower , by going to Control Panel >> Device Manager >> Ports How should we check it in Windows 10?
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3k views

How to add Android phone as a COM port in Windows 10 (via Bluetooth)?

My phone is Meizu M2, which I'd like to connect with my Windows 10 PC (via Bluetooth). I'm using an external bluetooth adapter for the PC. There's an android app called "Arduino Bluetooth RC Car" (...
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2answers
3k views

How can I find out the COM number of a serial device?

today I had to configure an Ethernet Switch (AT-8000GS/48) via serial console to turn on stacking mode and so on. I used a RJ45 to Serial-9-Pin to USB adaptor. First, I tried to use PuTTY under ...
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0answers
461 views

Configure UART/COM in Linux using Hyper-V Generation 2 VM

I've setup Linux Mint x64 in Hyper-V as a Generation 2 Virtual Machine on my Windows 10 desktop. I would like to attach a USB->Serial converter (FT232RL) to the VM, so I can program and debug embedded ...
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4answers
68k views

How to map a virtual COM port to a physical USB port?

My question is similar to Setting up a virtual Com Port?, which has no answers. I have software that can only print to a printer on COMx, a printer with a USB port, and a computer with a USB port but ...
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1answer
2k views

How to add/delete rules in Windows Firewall [closed]

I need to implement a tool which adds and deletes rules in Windows Firewall. The rules can be inbound or outbound, forbidding communication on specified protocols, IPs and ports. I am having trouble ...
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2answers
739 views

Where to set advanced settings for serial port on linux

I use a special USB to serial adapter to get data from legacy hardware. Under Windows i have to set some advanced settings in order to start sending data in a way the devices can "understand" and "...
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65 views

COM visible DLL only registered for Administrators

I have a 64-bit DLL and I also have an installer for this dll. This installer registers the dll as com visible. To do this i have to be admin. Everything works fine so far and i also can use the dll (...
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266 views

VirtualBox: create a serial port bridge to the same VM

I'd like to make a bridge between Serial Port 1 and Serial Port 2 on a VM. Practically this would route all data from VM Serial Port 1 back to VM Serial Port 2 so that an application listening on ...
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1answer
4k views

How can I register a (32-bit) COM DLL as a COM+ application

I heard that you can register a 32 COM server DLL in COM+ so it will be executed as local server instead of an in-process server. This solves a 64/32 bit issue, it would be possible to access the 32-...
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1answer
2k views

Simplest way to send characters to USB serial device on Mac using script

I have a simple serial device that I need to talk to (but not listen to) periodically via command. The device is connected OK as /dev/usbxxx. What is the simplest/easiest way to do this? Installing ...
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0answers
125 views

Executable fails to launch over RDP but works fine on physical machine

I have an executable written in C# running on Windows Server 2012 r2 If I start it, when I am working on the physical computer, it works just fine. But if I am logged into the computer through RDP it ...
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0answers
837 views

No COM1 port on hyper-v

I just made a fresh Windows 8.1 install and am trying to set-up a VM for kernel debugging. Therefore, I need to create a serial link to debug the VM using windbg. Usually I just simply add a new COM ...
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1answer
690 views

Why do I have to manually add Local Activation permission for domain account even if it's a member of the local Administrators group?

A SQL Server 2012 agent job was failing with: The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID {...} and APPID {......
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6answers
6k views

Cannot Delete Unwanted COM ports - Windows 7

I recently installed a Cannon wireless printer for temporary use, the drivers of which set nearly all my COM ports to be constantly in-use (an occasionnal bug noted in the ReadMe after installation ...
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1answer
2k views

Explorer.exe COMRuntime error: unexisting user can't get access permissions to COM server

since explorer has no appid, it's not possible to find relevant DCOM component in Component Services. I tried editing access rights in Elevated-Unelevated Explorer Factory component and editing ...
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1answer
75 views

Is there a way of knowing who the owner of an Explorer window is, and their groups/account rights?

Related question: Opening Explorer shell with admin privileges on XP (with IE7 installed) Once an Explorer window is opened, how can we tell the difference between one that is running as Admin and ...
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0answers
909 views

Check which com port my device uses?

I have a device hooked up to the USB connector and within it's software i have to choose which com port it uses. With Windows XP i would go to the device manager and go to com devices/ports where it ...
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2answers
2k views

Try to resolve logged error SQL Server/SQL Server 2008 R2

I have this logged error #10016 The application-specific permission settings do not grant Local Launch permission for the COM Server application with CLSID {46063B1E-BE4A-4014-8755-...
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0answers
2k views

Is it possible to use a terminal emulator with the LPT port?

I am not very experienced with terminal emulators, but most of the emulators I have seen and used are asking to connect over a serial (COM) port. Is it possible to use a terminal emulator with the ...
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2answers
410 views

How can I get an overview of COM ports on a Windows computer?

How can I see both physical and virtual COM ports that have been installed and configured on a Windows computer? Can I see the settings and services they have been assigned to, or do I have to go the ...
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4answers
46k views

How to wire the LPT and COM port headers on a motherboard?

I would like to add an LPT and a COM port to my computer. The board has no LPT or COM port on the I/O panel on the back. However, there are LPT and COM port headers on the board. You can see these ...
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3answers
22k views

Redirect serial com to tcp port [closed]

I would like to know if exists some utility that connects to serial port and redirect input and output to a tcp port. I need this for a Java application, I need to write and read to a serial port but ...