Create Virtual Com Port Windows 10

[Dallas Themshirts]

But ... I'm developing on a machine without an physical RS232 serial ports, but I would like to make fake serial ports that I can connect to and output data from with the aim of faking input from hardware sensors.

It provides pairs of virtual COM ports that are linked via a nullmodem connetion. You can then use your favorite terminal application or whatever you like to send data to one COM port and recieve from the other one.

One good option is Virtual Serial Port Emulator (VSPE) from EterlogicIt provides an API for creating kernel mode virtual comport devices, i.e. connectors, mappers, splitters etc. This is a small company but continues to expand and maintain their product list. (noted early 2023)

Another very good option is Eltima. This product worked as advertised in all aspects of its virtual comport offering, and included good technical support. Product options include both desktop applications, as well as software development kits with APIs. This company remains active and growing, with expanding product categories. (noted early 2023)

Pro tips:1) Windows may assign new COM ports to the adapters after every device sleep or reboot.2) The market leaders in chips for USB to serial are Prolific and FTDI. Both companies are battling knockoffs, and may be blocked in future official Windows drivers. The Linux drivers however work fine with the clones.

That way you can work directly with the sensors, and you do not have to try and emulate data. That way you are maybe even save from building an anemic system.(Due to your emulated data inputs not covering all cases, leading you to a brittle system.)

A virtual COM port or a virtual serial port is an ideal solution when a legacy software application expects a connection to a serial device port (COM port or COMM port) but cannot connect, due to a physical lack of available serial ports. Instead, we reconfigure the computer to send serial port data over a local area network or the Internet as if over a true serial port. When the legacy application attempts to send data to a serial COM port, it is actually transmitted through the virtual serial port over a TCP/IP connection. Information sent back to the legacy application also travels over the network where it is received by the virtual serial or virtual COM port, and is then finally passed to your legacy application.

Important Note: This tutorial deals exclusively with a virtual COM port implementation that is used with NetBurner devices. If you are looking for a native software solution to create virtual COM ports for use with other systems or hardware, we suggest the Virtual Serial Port over Ethernet Connector or the Virtual Serial Port Driver from our partners at Eltima Software. They are both incredibly stable and versatile utilities that support various Windows versions, up to the latest Windows 10.

Congratulations! You have now set up and tested your virtual COM port. We hope that you can see how this example can be expanded upon to incorporate your own legacy serial comm applications to work with newer computers that either have too few DB9 RS-232-style ports or none at all.

Permission is hereby granted to purchasers of NetBurner System-on-Modules and serial-to-Ethernet modules (NetBurner Devices) to use this program to create a virtual serial communications port on a Windows computer so long as the sole purpose is to connect to the NetBurner Device. No other rights to use this program or its derivatives in part or in whole are granted.

Thank you for bringing this to our attention. It looks like the link for the Virtual COM port software was not pointing to the right file. Please feel free to try the download again and let us know if you run into any additional issues.

Is it possible to set up a solution where, from a single computer, I can access multiple Cisco switch console ports over ethernet (USB console/serial ports with USB-A sockets on the switches) . i.e. some kind of command center with multiple switches defined and the ability to click between them effortlessly and bring up their unique console windows, have multiple sessions open at once etc. I understand I would probably need some kind of ethernet to USB-A serial hardware on each switch.

Hi Tony, thanks for the question! If I understand the setup correctly, it should be possible to have multiple switches talk to a single computer over Ethernet with the use of Serial-to-Ethernet converters. You would need one converter per switch. They would allow you to connect to the console ports with a network connection from any computer on the same network using a SSH or Telnet client.

Hi
Can I send data from one computer to other computer through internet cable which is in a same lan. If so, How to transfer data from one Virtual serial port to other port. Please provide step by step process.
Regards,
Vino

The process described in the article (and the software we provide) is really only applicable for individuals using our serial to Ethernet devices. You can connect two virtual serial ports together as you described across a LAN, but will need more general software to do so. You can find this from Eltima. You will need one virtual serial port to be set up as the server, and the other as the client. The client will then initiate the connection to the server, and at that point, you will be able to start sending data across the virtual serial ports. Good luck!

A virtual port (VPort) is a data object that represents an internal port on the NIC switch of a network adapter that supports single root I/O virtualization (SR-IOV). Each NIC switch has the following ports for network connectivity:

Default VPort
The default VPort provides network connectivity to the networking components that run in the management operating system. The default VPort has an identifier of NDIS_DEFAULT_VPORT_ID.

Nondefault VPort
Nondefault VPorts are not created implicitly when the NIC switch is created. An overlying driver, such as the virtualization stack, explicitly creates these ports by issuing OID method requests of OID_NIC_SWITCH_CREATE_VPORT. Nondefault VPorts may be attached to the PF or to a VF, and can only be created after the NIC switch has been created.

A nondefault VPort that is attached to a VF provides network connectivity to the networking components that run in the guest operating system. After it is created and attached to the VF, the nondefault VPort is in an activated state.

A nondefault VPort that is attached to the PF provides additional network offload capabilities to the networking components that run in the management operating system. For example, nondefault VPorts on the PF could be used to provide offload capabilities similar to the virtual machine queue (VMQ) interface.

An overlying driver issues an object identifier (OID) method request of OID_NIC_SWITCH_CREATE_VPORT to create a nondefault VPort on a specified NIC switch. This OID request also attaches the created VPort to the network adapter's PF or a previously allocated VF.

The overlying driver initializes the NDIS_NIC_SWITCH_VPORT_PARAMETERS structure with the configuration information about the nondefault VPort to be created. The configuration information includes the PCIe function to which the nondefault VPort is attached and the number of queue pairs for the nondefault VPort.

Note Starting with Windows Server 2012, the SR-IOV interface supports only one NIC switch on the network adapter. This switch is known as the default NIC switch. When creating a nondefault VPort, the overlying driver must set the SwitchId member to the NDIS_DEFAULT_SWITCH_ID identifier.

A value of NDIS_PF_FUNCTION_ID specifies the PF. Otherwise, the value must be set to the identifier of a VF whose resources were previously allocated through an OID method request of OID_NIC_SWITCH_ALLOCATE_VF.

The overlying driver can also specify the number of queue pairs assigned to the VPort. A queue pair is a transmit and receive queue on the network adapter that is assigned to the VPort. If the network adapter supports asymmetric queue pairs for nondefault VPorts, the overlying driver may specify a different number of queue pairs for each VPort that the driver creates. For more information, see Symmetric and Asymmetric Assignment of Queue Pairs.

The overlying driver calls NdisOidRequest to issue the OID_NIC_SWITCH_CREATE_VPORT request to the underlying PF miniport driver. Before NDIS forwards the OID method request to the miniport driver, it does the following:

NDIS validates the parameters within the NDIS_NIC_SWITCH_VPORT_PARAMETERS structure. If the parameters are in error, NDIS fails the OID method request and does not pass the request to the PF miniport driver.

When the PF miniport driver is issued the OID request, the driver allocates the hardware and software resources associated with the specified nondefault VPort. After all of the resources are successfully allocated, the PF miniport driver completes the OID successfully by returning NDIS_STATUS_SUCCESS from MiniportOidRequest.

If the OID_NIC_SWITCH_CREATE_VPORT request is completed successfully, the PF miniport driver and the overlying driver must retain the VPortId value of the nondefault VPort for successive operations. The VPortId value is used during these operations:

NDIS and the overlying drivers use the VPortId value to identify the nondefault VPort in successive OID requests related to this VPort, such as OID_NIC_SWITCH_VPORT_PARAMETERS and OID_NIC_SWITCH_DELETE_VPORT.

During receive operations, the PF miniport driver specifies the VPortId value to which a packet is to be forwarded. This value is also specified in the OOB NDIS_NET_BUFFER_LIST_FILTERING_INFO data of the NET_BUFFER_LIST structure.

Receive filters for media access control (MAC) and virtual LAN (VLAN) identifiers are configured on the VPort after it has been created. Overlying drivers dynamically set these receive filters by issuing OID method requests of OID_RECEIVE_FILTER_SET_FILTER. Receive filters can also be moved from one VPort to another through OID set requests of OID_RECEIVE_FILTER_MOVE_FILTER.

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