Mounting Options:
DIN-Rail Series
Workstation Series
Desktop Series
Rack Mount Series
The USBG-4X2FTDI 4-Port USB DB-9 Serial Adapter is a rugged plastic USB to Serial adapter that allows you to add 4 RS-232 serial ports to your computer by connecting to a single available USB port. There are no IRQ & COM port conflicts during install.
The USBG-4X2FTDI 4-Port USB DB-9 Serial Adapter is designed to make serial port expansion as easy as possible with its Windows 11 support. Connecting to a USB port on your computer or USB hub, the USB Quad Serial Adapter instantly adds four RS-232 serial communication ports to your system. By taking advantage of the USB Bus, the 4-Port USB DB-9 Serial Adapter installation of serial ports and devices to your system painless with both Plug-and-Play and hot plug features.
Plugging the USB Quad Serial Adapter to the USB port, the adapter is automatically detected and installed. There are no IRQ & COM port conflicts, since the ports do not require any additional IRQ, DMA, memory as resources on the system. The USB Quad Serial Adapter is self-powered and does not require any external power adapters.
The 4-Port USB DB-9 Serial Adapter provides instant connectivity with modems, ISDN TAs, PDAs, handheld & pocket PCs, digital cameras, POS, serial printers. It is suitable for remote access, retail and industrial applications, data collection and other applications requiring high speed RS-232 serial communication ports.
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The 4-Port USB DB-9 Serial Adapter has certain accessories that work with it. These accessories are what you can order if needed.
Model# 9DBMF5FT
$2.99In stock
View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!
Test your components by:
When testing cables:
When testing serial ports and devices:
Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.
Disable driver signature enforcement:
When your system restarts:
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.
Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.
Disable Driver Signature Enforcement:
After your computer restarts:
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.
Once the driver/software is installed, follow these steps to allow the software:
Michael Accardi –
5.0 out of 5 stars
Great product!!!!
I recently purchased two Gearmo 4 Port USB to Serial RS232 Adapters to set up a console server for managing my Cisco network lab, and I must say, I’m absolutely thrilled with their performance! These adapters are connected to a single Raspberry Pi 4, and the setup was a breeze. The installation process was straightforward, and I encountered no issues getting them up and running.What impresses me the most is the seamless integration and ease of use. The adapters are highly reliable, providing consistent and fast data transfers, which is crucial when managing a network lab. I’ve experienced zero lag or connectivity issues, making my lab management tasks significantly more efficient.The build quality is excellent, and the adapters are compact enough not to clutter my workspace. They’ve proven to be an invaluable addition to my setup, and I couldn’t be happier with how well they’ve met my needs. If you’re in the market for a reliable and high-performing USB to Serial adapter, look no further than the Gearmo 4 Port model. It’s a game-changer!
handy –
Works with Mac mini M2 Pro
Plug and Play out of the box. No drivers to install. Mac mini M2 Pro.
Gotallofthem “Speed Demon” –
I have a home lab that I have built for my Networking Studies, and I needed a way to access each switch/router without having to constantly plug and unplug my console cable each time I needed to make changes (which is really annoying if you know what I am referring to). My choice was between buying an access server which would have cost me a lot more, or purchasing this item. I must say this has done the job perfectly, I can control 4 different units, with one connection, and not having to constantly get up out of my seat. If you have a home lab, or you need a way to access your switches and routers at the same time, at home/work, this will work great for you.
JohnG –
Most of the inexpensive serial to RS-232 converters have been bricked (made unusable) by an update to windows 7 and 8 by Prolific(FTDI) in order to punish counterfeiters of their chips and I can understand that. However, it leaves people like me with
devices that are worthless! I have several converters from GearMo that have seemed to survive. Don’t know if it is the drivers they send or if they are using legitimate FTDI chips. The bottom line is that so far they work fine and are well built. I know for sure that the little blue converters and a lot of cheep ARDUINO boards suffer problems from the update. There is a somewhat involved workaround to fix the problem but I don’t know if it is worth it. Could be that another update from Prolific could render the fake ones inoperable again. Bottom line….. Pay a little more, buy from Amazon and one way or another your problems will be taken care of.
Ian –
Nothing comes close to the value. I’ve connected this to a raspberry pi in order to use it as a terminal server for my cisco lab equipment. I will be buying another one of these in the near future. I love that the connectors are numbered and that the cables are of a good length