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Description
StarTech.com 6ft RS422/485 USB Serial Adapter w/ COM RetentionThe StarTech. com 6ft RS422 485 USB Serial Adapter with COM Retention is the dependable bridge you need to connect RS422 or RS485 serial devices to a USB enabled computer. Built for professionals who demand reliability in industrial, laboratory, or field environments, this adapter delivers stable serial communications without sacrificing convenience. Its compact, robust design houses a 9 pin DB9 male serial connector and a long, flexible 6 foot cable,
The StarTech.com 6ft RS422/485 USB Serial Adapter with COM Retention is the dependable bridge you need to connect RS422 or RS485 serial devices to a USB-enabled computer. Built for professionals who demand reliability in industrial, laboratory, or field environments, this adapter delivers stable serial communications without sacrificing convenience. Its compact, robust design houses a 9-pin DB9 male serial connector and a long, flexible 6-foot cable, making it easy to reach devices that are tucked away or spread across a workspace. Whether you’re integrating legacy equipment, collecting sensor data, or controlling remote equipment, this USB-to-serial solution provides a seamless, ready-to-use interface that minimizes setup time and maximizes performance.
With RS422 and RS485 support, the adapter accommodates a wide range of serial devices—allowing differential signaling for longer cable runs and improved noise immunity. The DB9 male connector ensures compatibility with many existing serial devices and equipment that still rely on this widely adopted interface. The combination of USB connectivity and differential serial signaling makes this adapter ideal for data loggers, PLCs, CNC machines, measurement equipment, and other devices that require robust, low-latency serial communication. The COM Retention feature is a standout benefit, keeping your software configuration intact even when the adapter is unplugged and reconnected, which reduces downtime and eliminates the need to reconfigure ports after every reconnect.
Designed to be practical in real-world setups, the 6-foot cable length provides generous reach while keeping the footprint compact enough for crowded desktops, machine panels, or equipment racks. The unit is USB-powered, so there’s no extra power brick to manage, and it supports convenient plug-and-play installation on many operating systems. When you require a reliable connection for serial devices over USB, this StarTech adapter delivers predictable performance and steady COM port behavior, helping you maintain consistent control and data exchange across your applications.
In addition to its core capabilities, this adapter emphasizes ease of use and long-term value. The durable construction and straightforward interface minimize the technical overhead often associated with serial communications. It’s a versatile tool for developers, technicians, and engineers who need a dependable solution for connecting RS422/RS485 devices to modern computers. By consolidating the complexity of translating USB to serial into a single, well-supported device, StarTech makes it simpler to modernize setups that still rely on proven serial devices. The result is a flexible, future-proof option that reduces integration friction while preserving the performance benefits of RS422/RS485 signaling.
- RS422 and RS485 support for flexible serial communication in noisy environments and for longer cable runs
- 6-foot USB cable provides ample reach to connect devices across desks, benches, or equipment racks
- 9-pin DB9 male serial connector for compatibility with a wide range of legacy and modern serial devices
- COM Port Retention ensures stable, persistent COM port assignments across reconnects
- Compact, durable USB-to-serial adapter with plug-and-play capabilities and broad OS driver support
Technical Details of StarTech.com 6ft RS422/485 USB Serial Adapter with COM Retention
- Interface: USB to RS422/RS485 serial adapter
- Connector: 9-pin DB9 male serial port
- Cable length: 6 feet (approx. 1.8 meters)
- Signal support: RS422 and RS485 differential signaling
- COM Port Retention: maintains consistent COM port assignments across reconnects
- Power: USB-powered bus-powered device
- Driver compatibility: supports Windows, macOS, and Linux with available drivers
- Physical build: compact, durable form factor suitable for desktop use and industrial environments
How to install StarTech.com 6ft RS422/RS485 USB Serial Adapter w/ COM Retention
- Step 1: Plug the USB connector into an available USB port on your computer. The device should begin enumeration automatically on many systems.
- Step 2: Connect your RS422/RS485 device to the DB9 male connector in the correct wiring configuration as specified by your device's documentation.
- Step 3: If prompted, install the latest drivers from StarTech’s official website or allow the operating system to install the generic USB-serial drivers. Driver availability covers Windows, macOS, and Linux platforms.
- Step 4: Verify that a new COM port has been assigned by checking your system’s device manager (Windows) or the equivalent serial port listing on macOS/Linux. The COM Port Retention feature will help maintain a stable port name across reconnections.
- Step 5: Configure your serial communication program to use the COM port assigned to the adapter, set the appropriate baud rate, parity, stop bits, and flow control as required by your RS422/RS485 device.
Frequently asked questions
- Q: What is COM Port Retention? A: COM Port Retention keeps the COM port assignment consistent for the USB-to-Serial adapter across disconnects and reconnects, reducing reconfiguration in software that relies on fixed port names.
- Q: Can I use this adapter with both RS422 and RS485 devices? A: Yes. The adapter supports both RS422 and RS485 signaling, giving you flexibility to connect to a variety of serial devices and networks.
- Q: What is the length of the included cable? A: The adapter ships with a 6-foot USB cable, providing ample reach for most workstation or equipment layouts.
- Q: Is the adapter powered by USB? A: Yes. It is a bus-powered USB device, requiring no external power supply for typical use.
- Q: Which operating systems are supported? A: StarTech provides drivers and compatibility for Windows, macOS, and Linux, ensuring broad cross-platform support for this USB-to-serial solution.
- Q: Do I need professional installation to use this adapter? A: Most users can install and configure the device with basic driver updates and simple serial port settings. The process is designed to be straightforward and plug-and-play on supported systems.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 1065 reviews
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Product Reviews
★★★★★ 5
Great mouse
Number of Items: 1
Definitely reduces fatigue. Easy to use. Great response with less space needed for mouse movement. Stays charged for months you actually forget to charge it, ask me how I know :). I play video games with it and never have any issues with the movement and response time of mouse. And since my car wreck where I broke my thumb this is the only mouse that gave me the same as before the wreck abilities to move and operate the mouse. Highly recommend. One very broken thumbs up :)
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Reviewed in the United States on May 31, 2026
★★★★★ 4
Experience after one year of usage
Number of Items: 1
I had mainly used a MX Master 2S before this and because of my heavy usage I did start to feel uncomfortable after a few hours of use every day and that's when I decided to purchase MX Vertical. Now after almost 9 months of usage this has become the mouse I use on a daily basis, completely replacing MX Master 2S.
Comfort: It took me about a day or two to really get used to using it because of the positioning and ever since then my wrist has never felt any discomfort, literally. I don't have a mouse pad but because of the angle that my wrist is contact with the desk when I use it, this has never been a problem. What I also love about the ergonomic design is that my hand can actually just rest on it when not doing specific tasks, and it just fits my palm perfectly.
Functionality: I don't use it for gaming so I can't comment on that. However, comparing it with my Master 2S, there are some very obvious disadvantages. If you use Excel sheets a lot, or anything that requires horizontal viewing, the scrolling option is terrible. You can set up the function key on Logi Options+ and I use the side buttons for scroll right+left mainly because how easy it was to use with the Master 2S's side scrolling buttons. It is not comparable at all. With Master 2s, horizontal scrolling is smooth and precise. With this, it's basically useless. There are sites that just aren't responsive to the side buttons and when they do, you can never get to the precise point you want. Huge disappointment with that because I don't really use the side buttons for anything else. There is also no scrolling control with the middle button unlike the Master 2S, so you can't really scroll vertically as fast as you can when using Master 2S either. However I do use the middle button sometimes to just do the job for me so I'm ok with its basic functionality.
The top button is mainly used as a look-up button for me, so far its working pretty well and honestly it probably makes not much difference if they just completely take this button out for me. Maybe some people can find use in it as a switch for scrolling or mouse speed, or something else. Overall, the customizability of these buttons is very good, and depending on personal use, I can see it being very useful.
Battery life: Battery life is fantastic, never had any problem with it yet. I haven't really kept track but with my heavy daily usage (probably 10+ hours with no intense gaming), it can usually go for more than a month. You can also use it while it's being charged.
Durability: I have unfortunately knocked it over the desk a couple times on hard vinyl floor and there seems to be no problem with it at all. Before purchasing this I saw some comments about how it stopped functioning after being dropped to the floor and I was really worried about it. However that is not my case at all. It is very durable in my opinion and does its job perfectly even after dropping it a few times.
Overall, extremely comfortable to use. It helped with my wrist pain tremendously and now I use it for hours without feeling any discomfort. The functionality is severely disadvantageous compared to Master 2s and 3s, and possibly other gaming mouses as well, but if you are here because of wrist pain, this is the right product.
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Reviewed in the United States on May 24, 2024
★★★★★ 5
Finally, a comfortable vertical mouse for guys with large hands!
Number of Items: 1
I've been using the Logitech MX Vertical Wireless Mouse for about 8 years now, and I love it. Any time I have to use a traditional mouse it's an uncomfortable disappointment.
If you haven't used a vertical mouse yet, there are a couple things you need to know.
First - this is just a normal mouse, but it's turned about 60-degrees to the right. This let's your hand rest on the mouse in the natural position your arm wants it to be in without any effort to rotate.
Second - you will knock it over, repeatedly, for a few weeks. Because you're used to a mouse that's a just an inch and a half or so tall, your natural movement from keyboard to mouse is going to be interrupted by the height of the MX Vertical. In time, you will get used to this, but for a week or two, you will knock it over when moving to the mouse, and when moving back to the keyboard. Don't worry, your muscle memory will change and this will stop.
Third - once you get used to using the MX Vertical, you won't want to use any other mouse. It's a dramatic change in ergonomics, and you will feel the strain your wrist and forearm are under any time you have to use a traditional mouse.
There are other verticals that are also great, but as a guy with large hands, this is the best I've found. I have 4 of these now - one at my office, one at my dining room table, one at my desk, and one that travels in my backpack. I don't need all of these, but its handy having them where I need them. Another reason for this is the mouse can pair with 3 devices. I have different devices in each of these locations, so it's handy not having to re-pair when I move between locations.
The MX Vertical fits my hand perfect, and all buttons are where my fingers and thumb are naturally positioned. I've dropped them, knocked them down, bumped and tossed them and they keep on working properly, so from a durability standpoint, this will last. It's easy to pair with a push of a button - working with my Windows computers, MacBook, android phone and iPad. This thing just works great!
The only downside I'd mention is the coating. After a couple of years, the coating tends to migrate where you apply pressure. This is most apparent where the thumb and pinky finger rest. This doesn't cause any functional issues, and is entirely cosmetic, but just be aware that after a couple years it won't look pristine.
All-in-all, this is the vertical mouse to buy if you're a guy with larger hands. Get one, get used to it, and you won't regret it.
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Reviewed in the United States on February 6, 2026
★★★★★ 5
Highly recommend! Best in the market bar none
Number of Items: 1
I would like to say this is the perfect mouse and probably the best mouse you could buy on the market and it doesn't even come close. You can modify the mouse however you like with a click on the app. It's truly been a life changing experience with this mouse. With that being said, the perfect mouse does have a few flaws but nothing that would make me not recommend it to anyone only just be aware of these things. 1. It's a vertical mouse, sometimes it gets in the way and your wrist will knock it over, it will happen I promise you. 2. Logitech has a Flow feature meaning you can connect the mouse to three different computers at once if need be, qyeah I'll say it again, three computers connection! Wow! Well I only use it for two computers, the Flow works flawlessly but my gripe is how it sometimes doesn't sync with my Logitech keyboard Ergo K860, unfortunately, the keyboard doesn't come with the same Flow feature meaning I have to depend on the mouse to do it and it doesn't work sometimes and I have to switch between the mouse transition button to the key board transition button which makes for a long headache sometimes. 3. Believe it or not connection is sometimes an issue, it losses Bluetooth connection often and it doesn't matter which computer I use I have the same issues at work and home so I use the dongle for straight connection. Oh wait there are issues with the dongle connection too? Say it ain't so? It is! The issue comes when you have two dongles like me, the keyboard and the mouse, and try to connect both, like I said I have two computers and Logitech will not allow for their ”universal dongle” to connect to two different computers at the same time terrible design flaw. 4. Again, this mouse is incredible but it can sometimes be a little too much incredible, I know, I know but hear me out. The mouse is flawless fast, one quick wrist jerk and that mouse pointer on the screen is jumping all over the place, it's been hard to find a happy medium with the pointer, it's either you adjust to slow it down, making it too slow, or adjust to make it fast, which is too fast, again no happy medium even though there are plenty of settings to toggle with. I believe most vertical mouse tend to be that way anyway only with this mouse you can really tell the difference and that could be a good thing or bad thing depending on your perspective, it's sometimes a bad thing for me on Excel sheets. So the final verdict is this is still the best mouse out there and worth every penny and I would still give this 10 stars if possible, it's been a wonderful experience with this mouse. Again, the negatives are not bad or to make someone not buy it and considering the other features this mouse can do I recommend anyone who works all day on a computer to buy this product I highly recommend it.
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Reviewed in the United States on July 28, 2021
★★★★★ 5
Excellent Ergonomic Mouse for Long Workdays
Number of Items: 1
If you spend many hours at a computer and are looking for a comfortable, high-quality mouse, I highly recommend the Logitech MX Vertical. It has made a noticeable difference in my daily comfort and productivity.
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Reviewed in the United States on June 5, 2026
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