Have you had difficulty using a USB to RS-232 adapter to connect your RS-232 device to a computer? If so, you are not alone. Our customers frequently encounter issues with these adapters. In this article, I’ll briefly discuss the origin of these issues and provide you with some suggestions for successfully handling them.
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The Evolution from RS-232 to USB
In the old days of personal computers, one of the primary connections available was the RS-232 serial port. Apart from the parallel port, it was the primary means to connect an external device. The connector was reduced from a 25-pin connector to a 9-pin connector, but RS-232 ports remained present on every computer for many years. Built-in RS-232 ports featured direct mapping to memory and worked at a high priority. Data practically flowed directly to and from the software that was accessing the serial port.
4.1.2 Communicating with a USB Port There are two types of Solinst USB devices that you can use to communicate with Levelogger Software: Older style Optical Readers (received before February 2018) and PC Interface Cables (received before July 2018) that sometimes require updating drivers.
In 1996, the Universal Serial Bus (USB) standard was introduced as a replacement for the serial connector and other connector types that were typically found on the back of computers. The USB provided smaller connectors and more data throughput than the serial and parallel interfaces it replaced.
USB devices have high throughput, but they use a shared data bus. Data is wrapped up and transferred in packets. To handle the packets and move data in and out of the program accessing the USB device, a software driver is needed. The software driver sits between the hardware and the computer program you are using, and it must be installed and working correctly.
- Previously my logger worked perfectly through the USB, that was until I installed a new modem on my computer. Now, the logger will not work if the modem is plugged in. I must first un-plug the modem, plug in the logger, go to device manager and delete the logger driver under 'human interface devices'.
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The Necessity of an Adapter
With the widespread adoption of USB, most computers sold now do not have an RS-232 port. Therefore, to connect an RS-232 device (such as a CR1000) to a computer, you need to use a USB to RS-232 adapter, such as the 17394 converter.
While USB to RS-232 adapters perform a necessary function, they do have some limitations. For example, there are three types of problems that you may encounter when using a USB to RS-232 adapter:
- Driver issues
- Hardware issues
- Performance issues
Issue #1: Driver
The most common problem that our customers encounter with a USB to RS-232 adapter is getting the proper driver installed. The driver must correspond to the chip inside the cable—not to the manufacturer of the cable.
For USB to RS-232 chips, there are two primary manufacturers: Prolific and FTDI. Because off-brand chips with poor drivers are unreliable, Campbell Scientific recommends and currently sells a cable using an FTDI chip (part number 17394). We chose this cable because it uses a chip that has a certified driver available on Windows Update. (The older cables were silver in color and did not have a driver available for Windows beyond version 7.)
Tip: Test your USB adapters in the office with your field computer. When you are in the field, your computer won’t have an Internet connection to automatically download and install the driver.
If the driver for your adapter is not automatically installed or cannot be installed from a CD, you will need to identify the chip in your cable and locate the driver on the Internet. Some manufacturers identify on their packaging which chip is used inside their cable. You can also identify a cable’s chip from the Windows Device Manager by following these steps:
- In the Windows Device Manager, right-click your device from the list.
- In the drop-down menu that opens, select Properties.
- In the Properties dialog box, select the Details tab.
- In the Property field, select Hardware Ids from the drop-down menu.
- In the Value field, there is both a VID (Vendor ID) and a PID (Product ID). These IDs respectively indicate the manufacturer and the model number of the chip.
- In the example above, I did a quick Internet search for VID 0403 PID 6011, which revealed to me that the chip is an FT4232 manufactured by FTDI.
- After you know your chip type and manufacturer, you can locate and download the correct driver for your version of Windows.
Issue #2: Hardware
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USB to RS-232 adapters are commodity pieces of computer equipment. As much as we all wish that everything was as reliable as the CR1000, all adapter cables eventually fail.
Although there are two primary companies that manufacture USB to RS-232 adapter chips, there are many cable manufacturers who offer varying levels of cable quality.
- Higher-quality, industrial models should last longer, but they wear out over time—just like any field tool.
- A poorly constructed cable could have components that fail in a short period of time—perhaps even by the time you receive the cable.
I have seen several cases where old cables could no longer handle 115200 baud, but the cables still worked on low baud rates. There have been many more cases where a USB cable stopped working half-way through a day in the field.
Tip: If your field site is far from your office, take two USB to RS-232 cables with you. Lost time in the field can be a lot more costly than the purchase price of a second cable.
Issue #3: Performance
As mentioned previously, USB uses a shared data bus with packetized communication. The packetized communication introduced some latency (data transfer time) that wasn’t present with built-in RS-232 ports. Unfortunately, latency makes a noticeable difference when you download large amounts of data or upload a new operating system.
The driver for FTDI chips allows you to lower the latency time on packets. To do this, you can use the Latency Timer field, which is accessed through the Windows Device Manager. Follow these steps:
- From the Windows Device Manager, right-click your device from the list.
- In the drop-down menu that opens, select Properties.
- Click the Port Settings tab.
- Click the Advanced… button.
- In the Advanced Settings window, navigate to the Latency Timer field, and reduce the setting to 1 for best performance.
In addition to lowering your latency time, I also recommend disabling the Selective Suspend option for your cable. The Selective Suspend option allows Windows to put your hardware to sleep, which can result in corrupt data packets. To disable the Selective Suspend option, clear the checkbox for the Enable Selective Suspend field on the Advanced Settings window for your device.
Note: The Selective Suspend option is already disabled by default in the FTDI driver.
Newer data logger designs, such as the CR6, feature a native USB connection. Many devices, however, will feature RS-232 connections for years to come, and we’ll need to continue using USB to RS-232 adapter cables. I hope the suggestions I’ve provided help. Feel free to share any USB to RS-232 issues that you have encountered by posting a comment below.
In this post, we’ve managed to share you the Bundle of the Newest Qualcomm HS-USB QDLoader 9008 Driver for Windows 7,8/8.1, 10. This driver will use both 32 Bit & 64 Bit OS. We have also shared an in-depth tutorial for How to Install Qualcomm Driver or Installation them onto your Personal Computer running Windows OS.
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Nowadays, The Snapdragon Chipset can be used in most devices. The prevalence of Snapdragon Processor-based apparatus is rising day by day. There are a lot of Major brands are utilizing Qualcomm Chipsets within their apparatus like Xiaomi, OnePlus, Samsung, LG, Motorola, Lenovo & So on. Hence, In some events, you need Qualcomm HS-USB QDLoader 9008 Drivers on your Windows PC.
Below in this article, You are able to Download Qualcomm Driver & Quick Guide to How to setup Qualcomm qhsusb_bulk driver on Windows 7/8/8.1/10 OS.
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- ADB Drivers & Mi PC Suite
- Xiaomi Device running on MIUI
- A Computer running Windows 7,8,8.1,10.
- A Conventional USB Cable.
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Step 1 -Install either ADB or Mi PC Suite so as to communicate your device with Personal Computer. You have to need to set up ADB Driver by which Windows will recognize this gadget.
Step 2 –Now, Enable USB Debugging in your MIUI Device. For this, Visit Settings > About Phone > MIUI Version Tap on it 7 Times until it empowers the programmer option.
Again Contact Setting > Additional Settings > Developer Option > empower USB Debugging.
Step 3 – Switch off your device and Reboot into Fastboot mode. To boot to Fastboot style, Press Power on button + Volume down button & wait till the Mi Bunny Logo appears.
Step 4 – In ADB Folder, Open Command Window thereby pressing Shift + Right-click the mouse button. From the menu select”Open Command Window here”.
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Step 5 – Connect your telephone to Computer using USB Cable.
Step 6 – From the Command Window type, the next code & Press enter to boot your device into EDL Mode.
Step 7 – Now you apparatus will be from the EDL Mode now. Open device manager from control Manager by right clicking your computer icon.
From the device manager, you’ll observe that your device is detected but its drivers are not correctly installed.
It reveals your device by name”QHSUSB_BULK” in most instances.
Step 8 – Right-click on the device and choose “Update Driver Software“.
Step 9 – You will see a Windows Wizard or even Dialogue on your display. Pick”Browse my computer for driver software”.
Step 10 – Now extract Downloaded Qualcomm QDLoader USB Drivers on your computer and Choose Qualcomm > Driver folder in the extracted folder.
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Step 11 – Pick”Install this Driver Software Anyway” to install this driver in your windows. Dont worry it is asking for permissions only.
Step 12 – You may see the Driver installation completed successfully.
You will realize your apparatus will be listed in Device Manager.
That is it! We’ve successfully Install Qualcomm QDLoader USB Driver on your PC. Now, It Is Easy to Unbrick your apparatus from EDL Mode or Download Mode. You can use Comment Section if you faced any issue associated with this.
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Get information on how to Download Qualcomm QDLoader USB Driver.a step by step guide to install Qualcomm QDLoader USB driver on Windows 7/8/8.1/10.
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