Usb Serial Emulation
How Do I Emulate a COM/Serial Port Over USB? Applicable To. Supported DCS products, refer to the USB CDC Driver for Windows page or the user guide of the scanner. * If using DS3578 or LS3578, Bluetooth FIPs cradle part # STB3578-CF007WR must be used. Resolution / Answer. To emulate a COM port over a USB connection, please follow these steps.
The rest of my team will make for my application a simple non-standard USB microphone, but until they finish it I will have to emulate it, for integration testing purposes.
Is there any risk in a physical loopback?Yes there isWill a physical loopback work?Only with a USBbridge- There is any way to create a logical loopback? (MSDN has something about this)
- There is any general purpose USB emulator software?
In case there is many options available I'd rather work it .NET/Matlab/Python solutions.
Usb Serial Emulation Modem Driver
2 Answers
Edit: Proof of concept here
I strongly recommend this project, USB IP. It is a way of connecting USB devices over the network. There is a Windows client.
What this means is, you install the client on your Windows computer.This device then expects to talk to a USB device connected to a Linux computer, the server:
What you now do, is either create a fake device driver for Linux, that looks like is connected to a physical USB device, but in reality is just logic pretending to be your USB device. There are tutorials for writing USB drivers for Linux. Or you create your own stub driver for the Device Control Manager (see picture above). This stub driver could run on Windows or Linux, it wouldn't matter. It could even run on the same Windows machine which is the USB client.
Usb Serial Emulation Driver
The DSF USB Loopback Device mentioned in the question itself, would be the same kind of solution as a stub driver for the Device Control Manager, but taking Linux out of the picture altogether.
You can write virtual USB device using QEMU.You can duplicate already existing device, like the dev-serial.c found in this QEMU repository and change it for your needs.
After you write and compile your USB device you can simply attach it to your VM using the QEMU command line interface.
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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 Serial-to-USB adapter isn't a solution. I'm looking for software that tricks Windows 7 into mapping a virtual COM port to a physical USB port. I'm certain that if the software I'm using sends its stream of bits to the USB port that the printer will work just fine. How do I trick the software into thinking it's printing to COMx when it's actually printing to USBx?
Internet searches only turn up drivers for some specific hardware Serial-to-USB adapter, but that's not what I'm looking for as I don't have that hardware. I found a Microsoft forum where they suggested changing the USB port's label in Device Manager, but we never found anything like what they described; perhaps that's possible with a different USB controller than we have.
4 Answers
There is a simple way to do it using standard Windows commands. Lee Harrison's link shows this command, but here's a short description. Start by making the printer shareable (from Printer Properties > Sharing tab).
Now, start a command prompt and type:
Here, pc_name is the name of the sharing PC, and printer_share_name is the share name you gave the printer when you set up the share.
From then on, anything you send to COM1 will be re-routed to the printer.
There is one proviso however - and it applies regardless of which method you use to get the data to the printer, hardware or software:
As your program only knows about COM1, I assume it will send plain text to the printer. Many USB-only printers do NOT understand plain text, and will just ignore it altogether. Printers that do this are called host-based printers, where the Windows graphics engine converts the page into dots on the paper, rather than letting the printer do the conversion. They are mostly the low cost printers, especially inkjets but also some lasers. Printers that do understand text need to support a language called PCL5. PCL6 printers usually also support PCL5, but PCL3 printers do not.
If you tell me your printer model I can check what language it supports.
We use this solution in the company.
Virtual COM port (VCP) drivers cause the USB device to appear as an additional COM port available to the PC. Application software can access the USB device in the same way as it would access a standard COM port.
Here is the Instalation Guide.
This is a very specific scenario, but the following directions may work for you:http://www.decompile.com/dataflex/tips/usb_printer.htm
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Autocad 2013 crack xforce. However, I don't know if COM connections will even be selectable in your case since your PC doesn't have any to begin with. You may be able to purchase a USB/COM adapter just to gain access to these values, then use the above directions to forward to your USB printer.
Sounds kinda hack-ish but when you're running old software sometimes this is what it comes down. Whatever the solution, I don't know that it will appear to be elegant!
The final thing would be to just purchase a USB to serial/parallel adapter and a cheap printer that fits the specs. If you use this software in business, I think that's an easily justifiable expense.
If you need to emulate the serial port, this software make that kind of work https://www.eltima.com/products/vspdxp/ But I have no idea, whether you can talk to your USB with the emulated COM..
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