Our Clackamas Oregon model RR club has two Dell Optiplex 755 laptops purchased used from a recycle store. The one that communicates with our layout NCE power module through the serial port has stopped communicating and Windows Vista device manager reports the PCI serial port driver is missing and also the PCI simple communications controller and PCI bus controller drivers. I have searched for hours on the Dell support download site for these drivers and cannot find any help. I even ran a Dell diagnostic package and it reported no problems. Any suggestions or how to find the proper drivers will be greatly appreciated.
My problem is the serial port. Something takes over the serial port on start up and changes the baud rate to 1200 and some other parameters as well. RTS and DTR are set to on. These are different than what is set in Device Manager. My use needs RTS and DTR off in normal mode.
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So if I understand your answer the "PCI serial port driver" has nothing to do with the actual operation of the serial port on the machine and it's absence would not have caused the serial port to stop communication. It appears from the video that these missing drivers had something to do with an IT tech being able to take control of this machine and make changes in a large corporate setting such as Kaiser Permanente where I believe the machine originally came from. In that case should I somehow unload this PCI serial port ability? Does this involve a piece of hardware that was installed in the machine by the previous owners? Thanks
In Windows NT 4.0 and earlier, each Serial# subkey stores settings for individual serial ports. The settings in the Serial# subkeys take precedence over default settings for all serial ports in the Serial subkey. In Windows 2000, settings for individual ports are stored in device-specific subkeys of the ENum subkey.
Do not edit the Serial# subkeys in Parameters. To configure individual serial ports in Windows 2000, use Device Manager. Device Manager associates each port with the correct device-specific subkey in Enum and changes the settings accurately.
Can someone please send me the correct links for driver downloads for Dell Optiflex 755 desktop as my drivers are missing? I'm running Windows 8.1 64-bit. I've looked on the internet but cannot find anything. Please help.
Thanks for your suggestions. The PCI serial port driver & PCI simple communications controller driver are missing. I receive a scrambled picture when I try to transfer video via USB converter. Please help!
BAD PROCESSOR CHIPS?! Does some serial port cards really have bad processor chips? ABSOLUTELY! Unless you invest in a PCI serial card with a quality processor and chipset you will very likely, at some point, experience either a computer freeze, driver errors, being unable to communicate with your serial device or even a BSoD. The reason is that most low-cost PCI serial cards are designed with a low-cost processor which has low-cost poorly written drivers, which obviously results in headaches for the user.
Our Premium RS232 PCI Serial card shown in the image above uses a quality processor (MCS9835) from MosChip Technology/ASIX which provides superior performance and reliability at unmatched data transfer rates. The card adds two high-speed 9-pin serial COM ports to any PCI equipped (unlike USB based) computer with drivers available for Windows XP, Vista, 7, 8, 8.1 and 10 32/64-bit, DOS, Linux and Windows CE.
After installing the downloadable drivers the created COM ports will automatically show up in your operating system's Device Manager as two additional ports. Since these ports are PCI based they can be used as if it was standard built-in COM ports.
Both RS232 serial ports share same IRQ which saves valuable resources if other expansion cards are used. Easy Plug and Play installation automatically configures the next available COM port and IRQ address. COM ports can also easily be renamed within your operating system's Device Manager.
The PCI serial card is an easy and reliable way of adding serial ports to your computer. When shopping for a PCI serial card it is important that you choose a card which is suitable and compatible for your serial device and computer. Of high importance is the chipset of the card. There are many models and brands of chipsets, we recommend a serial PCI card chip from either Moschip or FTDI, these processors have proved to be effective and reliable in most applications.The typical serial card contains one or two serial COM ports however it is also available in multi-port versions.
Once the drivers for the serial card has been successfully installed a COM port will show up in your operating system's Device Manager where you can configure several port settings, if your serial PCI card has good drivers. Some cards with poorly written drivers cannot be configured. The COM port that shows up in Device Manager, created by the serial card and the drivers can be used as if it was a built-in COM port. Since the COM ports created with a serial PCI card are actual physical COM ports, not virtual COM ports, they can be used with almost any serial device, even latency sensitive devices since there are no data delays. Unlike USB based serial cards which due to the virtual COM port drivers have a substantial data delay which can make communication with some sensitive serial devices impossible.
Some low-cost PCI cards has jumpers which needs to be set in order for you to be able to communicate with a particular device. This is kind of old fashioned since most newer serial cards are automatically configured to match your serial device. You will however still be able to adjust several port settings in your operating systems device manager, such as baud rate, data bits and in some cases timing.
You can update your drivers automatically with either the FREE or the Pro version of Driver Easy. But with the Pro version it takes just 2 clicks (and you get full support and a 30-day money back guarantee):
DriverGuide maintains an extensive archive of Windows drivers available for free download. We employ a team from around the world which adds hundreds of new drivers to our site every day. How to Install Drivers Once you download your new driver, then you need to install it. To install a driver in Windows, you will need to use a built-in utility called Device Manager. It allows you to see all of the devices recognized by your system, and the drivers associated with them.
The Driver Update Utility automatically finds, downloads and installs the right driver for your hardware and operating system. It will Update all of your drivers in just a few clicks, and even backup your drivers before making any changes.
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 This page contains the VCP drivers currently available for FTDI devices.
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.
This utility allows users of LAVA serial cards to redirect the Com port name used by the card to one of the standard Com 1-4. Because some communications software applications only check for modems with the standard Com 1/2/3/4 names, the LAVA Com Port Redirector allows users to swap their existing Com 2 (for example) with Com 5 or Com 6 which may be their LAVA serial port Redirecting a Com port name does not change the I/O address space occupied by that port, nor does it change its assigned IRQ.
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The device does not have a device driver: When a device driver for a device is not available, Device Manager displays the device as Unknown Device and puts it in the Other devices branch. This is very common with universal serial bus (USB) and Institute of Electrical and Electronics Engineering (IEEE) 1394 composite devices. Also, a status of Error Code 1 or Error Code 10 may be displayed when you view the properties of the device in Device Manager.Note Most USB and IEEE 1394 devices function correctly without additional device drivers because they are configured by the drivers that are included with Windows for these bus types. However, an additional device driver is needed if the device does not fit the defined and supplied Windows class drivers. If the bus cannot identify the device, it interprets the device as a composite device and then reports it as such in Device Manager.
Unrecognized Device ID: Every hardware device has a special identifier that is used by Plug and Play. This identifier can include several different types, such as vendor ID, device ID, subsystem ID, subsystem vendor ID, or revision ID. If a device ID is not present, or your Windows XP-based computer does not recognize the device ID, Device Manager may list the device as unknown.Note Software programs that require virtual hooks into hardware may create these devices. Additionally, devices that bridge between bus types, such as a device driver that enables a parallel port device to emulate a SCSI or an AT Attachment Packet Interface (ATAPI) bus, are also known to generate an unknown-device response in Device Manager.
View the Setupapi.log fileIf the device has a meaningful name, use the information in the Setupapi.log file to determine the cause of an unknown device. By default, the Setupapi.log file is located in the %SystemRoot% folder.Sometimes the listed device name can be misleading. For example, a device may be listed as a serial device in Device Manager, when in reality it is not related to a serial port. This typically occurs when a partial Plug and Play ID is available, and Device Manager interprets it as a serial device. This interpretation may occur because of a compatible ID specified by the device. Again, this can be corrected by locating the startup program that may not be behaving correctly.Be aware that merely removing the unknown device in Device Manager does not work if a software program is the cause of the unknown device. You must remove the program and then restart your computer. If the unknown device is still listed in Device Manager after you restart your computer in safe mode, contact Microsoft Customer Support Services for help in removing the device. 2ff7e9595c
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