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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ADU&C COM Extension registration

I try to build a COM object to implement additional context menu according tutorial of Michael Dunn from codeproject. And everything works great in explorer but i cant find any information on how to ...
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Conecting a controller's RJ45 port to laptop's USB port

I have a CNC controller that uses RJ45 socket as a input for reciving instructions from my laptop. I use a USB to RS232 adapter and then RS232 to RJ45 adapter to finally connect my controller using a ...
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Windows 10 USB to COM driver with Software UT61C_D V3.03 (for Multimeter)

How can I find out if my laptop with Windows 10 support COM-ports? Can I use a virtual cable: USB to COM driver in windows, and how does it work? I tried different options on the web, but none of them ...
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539 views

Create virtual serial port (COM <-> TCP) via terminal on Windows 10

Context I am working with a module built around a headless Raspberry Pi CM3+, the only form of interface with which is an ESP8266 chip (bear with me, the question isn't about either of these) which is ...
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19 views

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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1answer
48 views

Code 39 for all LSP & COM ports in device manager

Under Windows 7 x64 enterprise, using an HP Z600 workstation, with two different COM port adapters, one USB and one PCI-E. I had the following issue. The devices had been reliable working for a year ...
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116 views

USB to Serial RS232 - device setup correctly but software cannot open port?

USB to serial set up correctly with drivers and device manager states "The device is working properly" and assigned to COM2, but no software seems to be able to detect or use COM2. cmd mode ...
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1answer
31 views

How to interact with USB device serially when it does not have a COM port?

I'm attaching a device to my computer that needs to interact through a serial interface. THe device when attached just shows up as a "USB Test and Measurement Device" in device manager as ...
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Attach USB device of a VM programmatically

I'm a test developer and I work in a company that develops its own hardware. Now I've encountered a problem while testing connectivity via USB with the HW. There is a brief summary of the test (tests) ...
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why does Comm or Putty doesnt recognize COM1 or any COM for my FDTI cable

When I try and run COMM program with my as shown bellow it says that I don't have anything in COM1 although in location it says that my cable is at port0001 as shown bellow. I have installed the FDTI ...
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AHK ComObjCreate(“Excel.Application”) invalid class string

I am trying to run Excel via AutoHotKey as every single tutorial suggests by using the COM object through this command ComObjCreate("Excel.Application"). However, it does not get past this command as ...
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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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19 views

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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986 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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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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140 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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113 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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38 views

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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570 views

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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332 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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543 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 computer by ...
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1answer
293 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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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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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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4k 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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288 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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865 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
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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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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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2answers
3k 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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190 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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4k 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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1k 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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1answer
291 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
516 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
654 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
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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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1answer
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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1answer
10k 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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2k 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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118 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
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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2answers
6k 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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2answers
16k 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 ...