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Inspiron 5770 Windows 10 - How to make USB look like COM port?
I have a legacy device that connects via USB, but needs to look like a COM port. In Device Manager, Ports (COM and LPT) does not even appear as it did in previous versions of Windows. So, how do I make my USB ports recognize a serial interface over USB? Do I need a new driver? If so, which one and where do I get it?
nyc10036
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June 14th, 2019 06:00
The driver you need depends on the IC that is in the adapter you are using which we don't know anything about except that you have one.
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mencik
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June 22nd, 2019 08:00
It is a simple USB cable, no adapter. On other computers, like my older HP also running Windows 10 and others running older versions of Windows, there is a section in the device manager for Ports (COM and LPT). On the Inspiron, there is no such section. If that section was there, you can select which COM port a USB device represents. Obviously something is different with the Inspiron as far as how the USB acts, and I suspect a driver is missing. If it is something else, I am open to suggestions.
nyc10036
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June 22nd, 2019 09:00
That makes no sense!
mencik
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June 22nd, 2019 16:00
You obviously have never dealt with a device that uses the old USB Type B to USB Type A cable for older devices. It communicates with the system as if it were a COM serial port. On many computers you can look in device manager and see Ports (COM & LPT) and you can specify the particular port that a USB interface will look like. On the Inspiron 5770 with latest Windows 10, the Ports (COM & LPT) is not part of device manager, so I can't specify, and my device cannot connect. It does not auto-detect.
nyc10036
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June 22nd, 2019 17:00
ROTFL.
I haven't have I????
ROTFL.
I guess you would have to tell my current employer that I am not actually programming for the COM port!
It is all in my imagination.
Your device needs a Windows 10 driver.
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U2CAMEB4ME
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June 22nd, 2019 17:00
Welcome to the Dell Community @mencik
Power-on and start tapping "f2" to enter BIOS setup.
See if you have the option to Enable or Disable the Serial Ports.
Best regards,
U2
Philip_Yip
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June 23rd, 2019 01:00
It depends what USB to Serial Adaptor you have. These ones Plugable USB to RS-232 DB9 Serial Adapter (Prolific PL2303HX Rev D Chipset) have a Driver which Windows 10 obtains directly from Windows Update. Do you have any unknown Devices or any Devices marked with an ! or ? in the Device Manager? If not does the port work on another PC?
speedstep
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June 23rd, 2019 03:00
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-driver-installation-based-on-compatible-ids
The PL-2303HX is a low cost and high performance USB-to-Serial Bridge Controller. Prolific does not make adapters.
The PL2303 Windows 10 driver can also be downloaded automatically via Windows Update. Just plug-in the PL2303 USB Serial device and Windows Update (Internet connection is required) will download and install the latest drivers.
NOTE:
Because this works the chip is often counterfieted. So beware of FAKE PL2403HXD adapters.
https://www.amazon.com/Plugable-Adapter-Prolific-PL2303HX-Chipset/dp/B00425S1H8
Windows Driver Installer Setup Program
(For PL2303 GC, GS, GT, GL, GE & PL2323 versions)
http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41
USB SERIAL
Windows 10
In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%\Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.
USB\Class_02
USB\Class_02&SubClass_02
Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\\\Device Parameters
To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:
"0x00000001"
Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
"0x00000000"
Enters selective suspend only when there are no open handles to the device.
JJ123
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February 3rd, 2021 13:00
@nyc10036 Why are you being so mean? The fact that you know more than someone about a subject does not mean you have to be rude to them about it.
@mencik good luck friend, sorry I can't help you out here