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Item#: N82E16815166032

Rosewill RC-300E - PCIe 1-Port Serial Card

  • PCI Express to Serial Port Card
  • Data Transfer Rate Up to 230,400 bps
  • 1 x Serial Port

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The Rosewill RC-300E PCI Express Card turns a PCI Express slot into a serial port. The card features a built-in 16C950 compatible UART, offering a convenient solution for connecting serial devices with data transfer rates of up to 230,400 bps. It is compatible with a broad range of operating systems, including Windows 2000, XP/2003 32/64-bit, Vista 32/64-bit, and 7 32/64-bit.

  • newegg Add One Serial Port to Your PC Based on 16C950 compatible UART, the Rosewill RC-300E card adds one Serial port to any PCI Express enabled computer for easy connection to serial peripherals.
  • newegg PCI Express Interface The use of PCI Express enables fast, bottleneck-free data transfer performance. Maximum data transfer rates of up to 230,400 bps ensure peak serial device performance.

Learn more about the Rosewill RC-300E




PCI Express to Serial Port Card
External Ports
1 x Serial Port
Data Transfer Rate
Up to 230400bps
Operating Systems Supported
Windows 2000/XP/Server 2003/Vista/7, Windows 8


Compliant with PCI Express Base spec 1.1
Compliant with PCI Power Management 1.2
Supports 1 x UART serial port
Built-in 16C950 compatible UART
128-byte deep transmit/receive FIFOs


Package Contents
1 x PCIe Serial Card 1 Port
1 x Driver CD
1 x User's Manual
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Rosewill RC-300E

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5 out of 5 eggsIf you got to have it

Pros: 1. Half and full height bracket
2. PCIe port for a serial port connection
3. Comes with software
4. Fast Transfer speeds based upon what is advertised
5. Manuals included
6. A good candidate for rack 1U height rack mount systems.
The bracket design is nice. You can remove a bracket for full-size to a half height without any problems. This is useful for small form factor cases. The bracket is enclosed.
It is becoming harder to find PCI ports on modern motherboard. Also Serial ports have gone the way of the past, too. These technologies were good in their day, but not so much anymore. There are some legacy devices that require a serial port. So now you can have one
The software is packaged with the device. Often these small devices do not have any software and you have to hunt online for it.
This device delivers the full 230,400 bps when attached a to serial device that can sustain that kind of speed. It just works.

Cons: 1. Does not work with windows 8, 8.1 or 10
2. Old technology
3. No manual for this exact PCIe Card

This device will not work with windows 8, 8.1 or 10. No drivers came with it. II never got it to work with Windows 8.1 or 10. I suspect that the drivers can be written if you really need to. Then your device may also be an issue. The drivers just are not compatible.
That is the next problem. This is legacy hardware. There are not many uses for it. I can see a few applications, but only a few applications where it is absolutely mandatory. Often the device outlasts the machine it is attached to. This is when you need it.
The manual for this PCIe card is not on the disk. There is a RC-301 available, which is close enough to make everything work.

Other Thoughts: If you got to have a serial port in a new build, this is a good choice. There is no other reason to buy it. It does do what it states. It works and was stable every time I used it. I tried several different pieces of hardware. They all worked. I will say they were all legacy devices.

I was going to ding it 1 star because it did not work with Windows 8 or 10. I did not, because its literature stated that it would work with Windows 7, but no higher system. It will also work with legacy server operating systems.

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  • Kim W.
  • 1/9/2015 6:44:15 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

5 out of 5 eggsWorks As Expected

Pros: This card works right out of the box with drivers given. I cant really ask for anymore.

Cons: Nothing to report as of now.

Other Thoughts: This card works right out of the box with drivers given. I cant really ask for anymore.

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5 out of 5 eggsRosewill PCIe Serial Card 1 Port

Pros: Before I begin my review on this product, let me set the record straight on something. NewEgg DOES NOT PAY their Eggxpert Reviewers ANY MONEY for a review (GOOD OR BAD - ON ANY PRODUCT)!!! When they 1st asked me to become a reviewer, they told me that I could post ANY TYPE of review that I wanted to, either GOOD OR BAD! The only thing that they asked me to do was to be honest in my review, which I try to be. Now that this is finished, let's start...

First off, this is NOT going to be one of my NORMAL reviews. You see on Friday when I got this product in the mail it was the same day I met a young Puerto Rican out by the Mall that needed a ride. Needless to say, I volunteered, which turned out to be a HUGE mistake. You see that young Puerto Rican mugged me and robbed me to the tune of $180.00 and a brand new Tablet and then beat me so badly that I spent the weekend in the hospital. Never again. This time the lesson was definitely learned. In case anyone is wondering how badly I was beaten then just think of the movie "Rageing Bull" where Robert Dinero has a scene where he shows how badly he got beaten. All together I got a broken nose, about 6-8 bruised ribs, a couple of broken teeth, along with a couple of bruised kedneys. Like I said, I could put Robert Dinero to shame with the pictures from my incident scene. It is now Thursday morning and while still badly bruised and scarred I thought I try and write his review. And I do mean try, so don't expect much...

Now I like Rosewill Products. I have used and bought them in the past and generally like the quality of their workmanship. They seem to fill a void that others forgot that was even there to begin with. Now don't get me wrong, they have also made some D-U-M-B products that made me think to myself, "WHAT we're they thinking?" This is NOT one of those. It's a good product, the problem is that it'll take some imagination to come up with some uses for it.

I like the 1/2 card height as this allows you to use either the FULL CARD HEIGHT or put on the 1/2 HEIGHT CARD ADAPTER that takes up less space. I also like the fact that it comes with a manual AND a Driver CD. This is one of my BIGGEST GRIPES against manufacturers' today. Why would you make something that REQUIRES a DRIVER and NOT INCLUDE it???

Cons: It seems that Rosewill did forget something. Namely the Drivers for ANY Windows 8 PC's. Duh??? How in the world could they forget this?

Other than this? None...

Other Thoughts: Let's face the facts here. In today's age, the need OR even uses for a Serial Buss are quickly disappearing, it seems like the USB Port IS the NEW Serial Port. When PC's 1st came out, there were many uses for them and us OLD Dinosaurs just loved them. They gave us all kinds of options and features we wanted. Some of the ones that come to mind (and ones that I have owned in the past are) Serial Scanners, Serial Printers, Serial Mice, Universal Power Supplies that used the Serial Connector to supply info to the PC (I still have a few of these and they work JUST fine). The best Hardware and Software applications I saw was a complete Weather Station that worked off the Serial Buss.

There are still a few Motherboards out there today that have attachment points (on the Motherboard itself) that allow you to connect a Serial Buss to your Motherboard itself and there are even some of them that have a Parallel Connector. Just for you OLD Parallel Printer Guys out these as well. We mustn't forget the OLD Dinosaurs (like me) out there, that still need feeding every once in a while too.

Now if you're lucky enough to have one of these newer Motherboards that have a Serial Buss on the Motherboard itself, then you really don't need one of these cards. But if you don't have that option, than this card will definitely fit your needs.

There are endless uses for this card, IF you have the need for one. The problem is that unless you have SOME PROGRAMMING EXPERIENCE or an already written program for it, then you're going to be lost as to WHAT or HOW this card will work or even the applications it could do (or even be able to do). One thing I have found over the years, is that PC's are a life-long learning experience. Some of us are still learning today... Have fun...

0 out of 2 people found this review helpful. Did you? Yes No

4 out of 5 eggsGets the job done

Pros: - Reasonably priced
- No waste in packaging
- Compatible with low-profile form factor cases
- Includes instructions that are actually viable
- PCI-E x1 interface allows versatility in installation

Cons: - No driver for Windows 8 64-bit
- There's a model for a few dollars more that claims to be Windows 8 compatible -- and has a pair of serial ports

Other Thoughts: Not a lot going on here. Sturdy construction on a simple serial card. Newegg specifications claim Windows 8 compatibility -- not accurate. One of the few reviews points this out, and it was from more than a year ago...time to update that product page.

Both of my machines are Windows 8 64-bit boxes, so I through together a quick and dirty Windows 7 64-bit test bed. Tested multiple install methods (included disc, driver download from site) -- all worked without a hitch. Today's PCI/PCI-E devices are generally more attractive affairs that blend in nicely with pretty mobos, clean cabling, and blingy video cards. Not the RC-300E. Exposed grey ribbon cable is about as good as it gets. Just functional, utilitarian basics going on here, and most likely not a device that somebody would have installed inside a fancy gaming machine.

Not sure how many consumer serial devices are really out there these days. I only own one device with a serial connection, but it's a great one to pair up with this unit -- an APC UPS. The APC came with software and settings that could be accessed over a serial line -- but I've never been able to use those features due to me running gaming mobos that long ago stopped providing PCI slots for optional serial brackets. I have plenty of open PCI-E x1 slots on this test bed, so I finally get to see if APC software can do it's thing. Installed the APC software, shut things down, connected the serial cable, powered backup -- we're in business. went ahead and played around with the APC shutdown settings, as well as a variety of power readings and logs, all of which were picked up over the serial connection as expected.

Outside of a UPS, I'm not sure how many people are really in need of a serial device these days, with most every interface having moved to USB, but regardless of that, if you are in the market for a sturdy serial card with versatile installation options, that doesn't bust your wallet (one would hope not, as they used to basically give these things away with mobo load outs) -- the RC-300E will do the job nicely. Just make sure you're not running Windows 8, as the card has been out long enough now, that if they were going to release a Win8 driver, well -- it would have already happened.

1 out of 1 people found this review helpful. Did you? Yes No

5 out of 5 eggsGreat Card

Pros: This card is an excellent solution for Windows 7 PCs. Comes with a low profile bracket as well for smaller form factor systems. Included drivers worked with Windows 7.

Though I didn't need the smaller bracket, I switched out the plate just to see how difficult it would be. It's a simple matter of removing two screws and unplugging a ribbon cable connector, attaching the different bracket with the two screws and then plugging the cable back in. A very simple switch.

This card will make its final home in my wife's workstation that she uses for architecture (Revit mostly). She is a MAJOR USB port monopolizer. She has wireless keyboard, mouse, a phone dock, tablet dock, three external hard drives, two iPods (one for exercise and one for the car), and some other weird gadgets like a drawing pad or some such. Anyway...the USB ports on her computer are the chance to use this card with her UPS instead of a USB cable was a no-brainer.

The CyberPower links up with the UPS software through the serial port perfectly. I pulled the plug and the software immediately began the process of shutting the computer down to save data and protect from any kind of corruption as it is supposed to do.

Cons: No cons that I came across.

Other Thoughts: It would appear that this card does not support Windows 8. Even though no computers in my home have Windows 8 I could see this being a problem for other users. Be sure to contact Rosewill before purchasing if buying for Windows 8 and they should be able to recommend the proper device. Though I did not contact Rosewill's support for this particular product I have contacted them in the past with questions and concerns on power supplies and card readers and they have always been very prompt and helpful.

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  • James A.
  • 9/27/2013 6:51:55 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsRC-300E

Pros: Product works as decribed in a Windows 7 64 Bit computer. Will post back after running in a business setup 24 x 7.

Cons: Shipping policy of Newegg which I have complained many times. Select next day and rush just to recieve the package on the second day and not the next day. Should simply have a cutoff time or state package will not reach for next day when choosing the shipping method. I have ordered from other supply place since they will have it to me next day.

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  • Julika P.
  • 9/12/2013 1:43:27 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsI wish motherboards would still have io connectors

Pros: Worked fine in old windows server 2003 32bit
faceplate to accomodate low profile systems

Cons: Rosewill doesn't list on their specs which chipset its using
costs just as much as 2 port version

Other Thoughts: If you need a low profile card get this otherwise the 2 port version costs just as much

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  • Heath S.
  • 4/3/2013 9:27:03 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month

5 out of 5 eggsWindows 8 (64 bit) not supported

Pros: From other comments, this appears to be a good card for Windows 7.

Cons: Just a warning to others. I recommended this card to someone running Windows 8 and it turns out that the product description is not correct, Windows 8 is not supported. This was confirmed with the manufacturer. Newegg is aware and should really change the description to reflect this fact. There is a different card by this manufacturer that does have Windows 8 driver. I believe it is a 2 port card and costs $5 more. Well worth the money if you want to avoid the frustrations on Windows 8.

1 out of 1 people found this review helpful. Did you? Yes No

  • Ivan M.
  • 11/4/2012 11:55:14 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggs

Pros: Very easy to install with Windows 7. Works great with Pronto Edit 4, TS1000 & TSU2000 universal remotes. It also workes with my old Garmin 12XL & Map Sourse.

Cons: None

Other Thoughts: Great product!

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  • Jonathan K.
  • 6/4/2012 5:03:52 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsWorks great!

Pros: Easy install, works great.

Cons: None

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Item#: N82E16815166032
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