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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)

Terminal, computers, modems and other hardware often used a RS-232 serial port for communication. The IBM Personal computer usually shipped with a pair of serial ports and in DOS these were accessaible as COM1 and COM2.

The name 'com ports' rather than serial ports originated around this time and is still in use, even though physical serial ports are becoming obsolete. However virtual com ports providing similar functionality are still in use.

The tag might also be relevant.

91 questions
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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?
Zulqurnain Jutt
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20
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4 answers

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 pictured in the image below. So instead of buying…
Samir
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Linux acting as USB device

I am working on an embedded Linux platform and I have need to transfer data between the platform and a PC. The embedded Linux has a USB device port (like a printer), so this is the means by which transfers would take place. I envision the easiest…
Aaron
9
votes
4 answers

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 no serial ports, so the oft-suggested physical…
Needleroozer
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9
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3 answers

Redirect serial com to tcp port

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 seems very hard... java will better work with…
Tobia
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What does COM object mean?

What is it? As I understood it's a kind of Microsoft special technology for some objects. But what exactly?
Sergey
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Finding COM ports in Windows 10

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.
Elizabeth Frank
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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 try to connect to it using the pyserial module, an…
Furo
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How can you test communication on a COM/Serial port?

We have a OHAUAS defender 5000 series model T51P Weighting scales with a COM port. if we connect this to a PC we should be able to get the weight on the computer by sending a command to it. Is there a way to test this? i tried the command line echo…
Andy
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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-bit COM DLL in a 64 bit CScript host. How do I…
harper
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What is a simple way to send characters to USB serial device on macOS 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 software (python, minicom, whatever) is fine. The…
Bohemian
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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-4014-8755-5B377CD462FC} to the user NT…
rheitzman
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Virtual COM Port Using usbser.sys Keeps Dropping

I have a C# wpf application that is communicating with a device via a virtual com port over USB. This device is using the usbser.sys driver. Everything works normally as expected and communication is fine between the device and my application. I am…
stephen776
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Install COM AddIn without adminstrative rights

I have a custome excel add in. I would like to install it on XP machine (to be added on Excel 2007). The problem I am having is that users don't have admin rights and also they have no permission to edit registry. I have tried to follow this way,…
Emmanuel N
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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 update per second. Background (I'm not sure…
James
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