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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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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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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Virtual COM Port Frame Error Treatment on Windows [FTDI]

I have a virtual COM port on Windows from Future Technologies (usb converter) which works fine but has a funny cravat with frame errors. When I pull the receive line low for a long time on the device, ...
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RS-485 to USB Adapter For Communications Port

i appreciated the similar questions dialogue. very nice. i hope this is a unique question... i'm using a rs-485 to USB type B adapter connected to a pid controller for my kiln. this allows me to ...
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115 views

USB PCMCIA READER TO COM PORT

I recently got a USB PCMCIA reader, however the software I need to use it with reads from the COM PORTs. How can I change the USB port to a com port o the software can read the PCMCIA card?
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How to know the process which triggers a COM server start?

Let assume the process ABC.exe -Embedding is running on my machine, and its parent is: svchost.exe -k DcomLaunch -p. I wish to know which local COM client process triggered the initial start of ...
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55 views

Are the communication protocols too different between USB and Ethernet?

I have a PA system that has 60 devices of which 57 are indoor wireless modules. They need a USB-a to b cable to program, and according to the manufacturer there is no way to program it over wireless. ...
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58 views

Change from universal serial bus controllers to COM port

When I plug my USB device it is recognized as universal serial bus controllers in device manager but I would like to be on COM port because I would like to use python script to control it. It works ...
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dialup connection stop working suddenly

we create a windows standard 56000 bps modem on a COM port, and dialup via the modem. dialup connection could be established. but we suffer a issue that dialup connection stop working suddenly. From ...
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Weighing Scales connected by RS232 to USB keeps disconnecting

i have some weighing scales with a serial port (RS232) and are connected to Windows 10 PC with a Serial to USB Cable. The scales are detected (COM3) and drivers are installed correctly, and im able ...
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23 views

Abstract serial port for multiple listeners

So my title isn't the greatest, but that's because I'm not sure what exactly I would describe this as. What I'm looking to do specifically, is to take a single serial device(on MSWindows), and allow ...
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How to connect to an FTDI Serial COM port from Wine on OSX?

I had a look at these existing answers: Converting the /dev/ttyUSB to com port to use it with Wine in Linux Serial port access errors in WINE Converting the /dev/ttyUSB to com port to use it with ...
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235 views

How to register COM dll successfully?

I use RegAsm.exe (Administrator mode)register the COM library, cmd: 'RegAsm.exe xxx.dll /tlb:xxx.tlb /codebase', the following is the cmd message: RegAsm : warning RA0000 : Registering an unsigned ...
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Not able to hit break-point in COM code when double clicking embedded object in Outlook 2016

I am able to copy/paste an embedded object from my application to Outlook. When double clicking the object, it should hit a breakpoint in the DoVerbOpen() method in my ATL COM class. This doesn’t work....
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Use USB Barcode Scanner as Serial Device

I have an USB barcode scanner that is recognized as Keyboard. I have to read the scanned barcodes in background using Java but it seems to be no way to read directly from an USB port (and I do not ...
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Set a COM Port for USB on Windows 10 Dell Inspiron 5770

Need to set a USB to a specific COM port for a legacy device. There is no section in the device manager for Ports (COM and LPT). Thus I cannot follow the direction on how to do that that are ...
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136 views

assigning com ports to usb ports of a usb hub

I am starting to automate my lab and for that I need to connect 8 devices to my computer (not enough USB ports). All of them can communicate through a virtual com port. My question is that if I ...
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147 views

How to convert from an EasyLyte RJ-12 connector to and RS-232 serial connector

I have a device with an RJ-12 connector, I need connect to a computer by RS-232. This is document of device: Computer Connection: The EasyLyte systems can be interfaced with an external ...
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117 views

Why does Group Policy block to create ISensorManger instance?

I have a Surface Pro 3, running Window 10 Pro, version 1803. One of the things that I do with this tablet is play around with the new API and programming features that Microsoft provides. Recently, ...
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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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540 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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655 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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2k 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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140 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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563 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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23k 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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756 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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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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2k 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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120 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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2k 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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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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807 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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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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186 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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460 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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542 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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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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2k 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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9k 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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1k 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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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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3k 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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5k 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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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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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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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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11k 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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669 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 ...