For LS/FS it does not matter, it will work. For HS, it depends on how you wire things up to the connectors. If you plan on also using standard cables, then it may be unstable. If the cable will be actual USB cable just terminated to a different connector, it will likely be fine. And absolutely no for anything USB3. Given that it is a keyboard, it will likely be FS. Answer from AlexTaradov on reddit.com
Amazon
amazon.com › db9-usb › s
Amazon.com: Db9 To Usb
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Reddit
reddit.com › r/askelectronics › can a db9 connector be used as a usb connector
r/AskElectronics on Reddit: Can a DB9 connector be used as a usb connector
April 21, 2025 -
For a keyboard build iam looking at different connectors I like the look of an db9 connector. Can I use this instead of a usb connector. So the protocol will be usb, cable will also be usb. I'll snip the usb type a of and replace it with a db9 and do this on the keyboard side to. Will this matter For the signal?
Top answer 1 of 9
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Lmao why is everyone hating on this so hard. USB signals get sent over all sorts of non-standard connectors. As someone pointed out many industrial tooling use ruggedised locking connectors on the equipment that terminate with a USB A on the other. OP - yes this can “technically” work if you create a custom connector for your keyboard and recipient device. My only suggestion would be to fill all the unused pins with epoxy so the cable is somewhat keyed to your custom arrangement. Just reduces the chance it gets plugged into the wrong thing one day. But yes, this will work for a flippin keyboard. If it doesn’t - solder on a normal USB A. You had fun trying.
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For LS/FS it does not matter, it will work. For HS, it depends on how you wire things up to the connectors. If you plan on also using standard cables, then it may be unstable. If the cable will be actual USB cable just terminated to a different connector, it will likely be fine. And absolutely no for anything USB3. Given that it is a keyboard, it will likely be FS.
Is it possible to rewire a DB9 serial connector to a usb without an adapter?
Why would speakers need a serial ... uses a DB9 connector. but it uses it for power and audio signal connection. you are missing the amp. ... It can't be done. RS-232 (or serial) uses voltages which range from negative to positive with 0V as a non-input reference. USB however ranges ... More on reddit.com
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November 28, 2014Can a DB9 connector be used as a usb connector
For LS/FS it does not matter, it will work. For HS, it depends on how you wire things up to the connectors. If you plan on also using standard cables, then it may be unstable. If the cable will be actual USB cable just terminated to a different connector, it will likely be fine. And absolutely no for anything USB3. Given that it is a keyboard, it will likely be FS. More on reddit.com
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April 21, 2025USB to DB9
Yes, you will need a cable like that one to convert. USB and serial are electrically very, very different, so they cannot talk to each other without a converter chip in the middle. Inside the plug in a converter cable are conversion electronics. However, that cable looks a bit pricey. You can pick up one up on eBay for considerably fewer dollars. More on reddit.com
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January 12, 2015Trying to convert a usb cable to a db-9 serial socket, to cut out the bulky connector
db-9 DE-9 (not db-9). "E" is the shell size. Reference what exactly goes on inside the bulky [DE-9] connector? Nothing much, just pain contacts. No smarts, no electronics, just conductors. Trying to convert a [USB] cable to a [DE-9] serial socket "Serial" can mean a whole bunch of different protocols: CAN, ETHERNET, I2C, SPI, RS232, USB, 1-Wire, UART, SATA etc.. Do you mean RS-232? If so: https://www.google.com/search?q=rs232+to+usb+adapter More on reddit.com
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October 19, 2022How do I install my USB serial adapter in Windows XP? (.exe method)
Prior to installing this device, ensure that your operating system is up to date (for example, you have installed the most recent service pack). To install the driver: Download the latest drivers from the StarTech.com website ( http://www.startech.com/Support ). You can find the part number and product ID on the product’s packaging. Note: Windows will typically save the files to the Downloads folder that is associated with your user account (for example, C:\Documents and Settings\ your_name \My Documents\Downloads). Once the download is complete, right-click the zip folder that you downloaded,
startech.com
startech.com › home › add-on cards & peripherals › serial cards & adapters › icusb232pro
1 ft USB to Serial DB9 Adapter Cable | USB Serial Adapters
How can I check if my USB device is properly detected by Mac OS?
To confirm that the Mac OS detects your USB device, complete the following: Click the Apple icon. Click About This Mac . Click More Info or System Report . Under the appropriate heading, confirm that your USB device is listed and that there isn't an error. For example, a network card would be under Ethernet Cards . You may need to refresh the System Information page after you plug in your device. To do so, press Command + R with the System Information page open. Your USB device is listed according to the name of the chipset. To determine the name of the chipset of your USB device, navigate to
startech.com
startech.com › home › add-on cards & peripherals › serial cards & adapters › icusb232pro
1 ft USB to Serial DB9 Adapter Cable | USB Serial Adapters
How do I confirm that Windows detects my USB device?
To confirm that Windows detects your USB device, complete the following: Press the Windows key+ R , type devmgmt.msc , and press Enter . In Device Manager , under the appropriate heading, confirm that your expansion card is listed and that there isn't an exclamation mark next to it. For example, a USB controller card would be under Universal Serial Bus controllers . Your USB device is listed according to the name of the chipset. To determine the name of the chipset of your USB device, navigate to www.StarTech.com and look on the Technical Specifications tab for your product.
startech.com
startech.com › home › add-on cards & peripherals › serial cards & adapters › icusb232pro
1 ft USB to Serial DB9 Adapter Cable | USB Serial Adapters
Videos
01:59
USB to RS-232 DB9 Serial Adapter Cables | StarTech.com - YouTube
01:09
SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Converter Cable, ...
03:11
How to Make a USB to RS232 Serial Cable (Pick the Right Converter) ...
01:13
Easy To Use USB 1.1 To DB9 Adapter - Connect Serial Devices To ...
43:07
Building a DB9-to-USB Retro Controller Adapter for use with Emulators ...
02:11
BAFO USB to Serial Adapter Review & Setup Guide for DB9 - YouTube
Sabrent
sabrent.com › collections › 10percent › usb 2.0 to serial db9 male (9 pin) rs232 cable adapter
USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter - Sabrent
USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter
· Provides the connection between USB and the traditional RS-232 serial port. · Supported OS: Windows 2000/ME/98SE, Windows XP (32/64-bit), Windows Vista (32/64-bit), Windows 7 (32/64-bit), Windows 8/8.1 (32/64-bit), Windows 10 and higher (32/64-bit), Mac OS X 10.6 and Above, Linux 2.4 or above. · Easy to setup: Plug & Play - Simply plug your device into the adapter and the adapter into your PC or Mac. · COM ports and Baud rates can be modified to desired set up. · This product comes with LIFETIME manufacturer warranty. ·
Price $11.99
Comprehensive
comprehensiveco.com › home › adapters & dongles › usb adapters › usb to network adapters › usb a male to db9 male adapter cable 3ft
USB A Male to DB9 Male Adapter Cable 3ft
USB A Male to DB9 Male Adapter Cable 3ft
Features• Supports automatic handshake mode • Supports remote wake-up and power management • Free your RS-232 ports for other uses • RoHS Compliant • Lifetime Warranty Description USB to serial adapter provides an external plug and play RS-232 serial connection with your computer, let you free up you existing serial port. Users have the capability to utilize it with serial port interface in an easy use environment. The adapter is designed for connections to cellular phones, PDAs, digital cameras, modems or ISDN terminal adapters through your USB port with up to 230 kbps data transfer rate. · S
Price $35.99
StarTech.com
startech.com › home › add-on cards & peripherals › serial cards & adapters › icusb232pro
1 ft USB to Serial DB9 Adapter Cable | USB Serial Adapters
1 ft USB to RS232 Serial DB9 Adapter Cable with COM Retention - TAA
1 ft USB to RS232 Serial DB9 Adapter Cable with COM Retention - TAA
Price $37.91
Best Buy
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usb to serial rs-232 db9 adapter cable - Best Buy
March 30, 2026 - Shop for usb to serial rs-232 db9 adapter cable at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up
Legrand AV
legrandav.com › products › cables_and_connectivity › usb_cables › 1_5ft-usb-to-db9-serial-rs232-adapter-cable › cg26886
Legrand AV | C2G CG26886 1.5 ft USB to DB9 Serial RS232 Adapter Cable
Connect DB9 serial gear to modern USB with the C2G CG26886 1.5ft adapter. 230kbps+, plug and play, no IRQ conflicts ideal for laptops and Surface. Learn more.
StarTech.com
startech.com › home › usb serial adapters
USB Serial Adapters - RS232 | DB9 | RJ45 | StarTech.com
Our USB to Serial Adapters offer a reliable and cost-effective way to bridge legacy serial devices with USB-enabled systems that lack support for serial peripherals.
Walmart
walmart.com › electronics › laptops
USB to RS232 DB9
Shop for USB to RS232 DB9 at Walmart.com. Save money. Live better
Reddit
reddit.com › r/techsupportmacgyver › is it possible to rewire a db9 serial connector to a usb without an adapter?
r/techsupportmacgyver on Reddit: Is it possible to rewire a DB9 serial connector to a usb without an adapter?
November 28, 2014 - Nope. Usb != serial. ... I have a computer with a male DB9 port on the mobo. Can I cut off the male DB9 on the speakers and solder a female DB9 on then connect it to the computer? ... If you're careful. But theres connectors that will do the work for you.
The Home Depot
homedepot.com › p › Micro-Connectors-Inc-USB-to-Serial-DB9-Adapter-for-Windows-10-Win-8-7-XP-Vista-E07-160 › 310860172
Micro Connectors, Inc USB to Serial DB9 Adapter for Windows 10/Win 8/ 7/ XP/Vista E07-160 - The Home Depot
Micro Connectors, Inc USB to Serial DB9 Adapter for Windows 10/Win 8/ 7/ XP/Vista E07-160
Enables a serial device to be connected to a computer through the USB port. Great for PDAs, cell phone, digital cameras, and modems over 500 Kbps data transfer rate. True Plug and Play, No additional power needed, light weight, No Interrupt setting, Easy COM port and speed setting. Easy to install for Windows 8, Windows 7, Vista, and other Windows Plus Mac system. This product uses the popular Prolific 2303 chipset.
Price $11.82
CSS Electronics
csselectronics.com › products › db9-db9-usb-power-adapter
DB9-DB9/USB Adapter Cable – CSS Electronics
DB9-DB9/USB Adapter Cable
Need to set up dual CAN/LIN telematics? This adapter lets your CANedge2 log 2 x CAN/LIN data - while powering a 3G/4G USB WiFi router. Buy now!
Price €30.00
SF Cable
sfcable.com › usb-db9-adapters.html
Buy 1ft USB to Serial DB9 RS232 Cable Adapter with Screw
1ft USB to Serial DB9 RS232 Cable Adapter with Screw
The Sabrent USB to Serial converter is the perfect solution for transferring data from a PDA or digital camera. The USB to DB9 provides a connection between an available USB port and the more traditional RS-232 serial port found on many devices. This adapter is designed for connections to cellular phones, PDAs, digital cameras, modems, or ISDN terminal adapters through your USB port. Simply plug your device into the adapter and the adapter into your PC or Mac. COM ports and Baud rates can be modified to desired set up.
Cable Length: 1 ft Cable
Color: Black
Side Connectors: Male Thu
Price $16.95
Office Depot
officedepot.com › a › products › 298170 › C2G-15ft-USB-to-DB9-Serial
C2G 1.5ft USB to DB9 Serial Cable RS232 Adapter Cable Convert a DB9 RS232 serial device to USB great 26886 - Office Depot
C2G 1.5ft USB to DB9 Serial Cable - RS232 Adapter Cable - Convert a DB9 RS232 serial device to USB; great - 26886
Reliable USB-to-serial connector.
Price $34.99
Amazon
amazon.com › Serial-Adapter-Chipset-Supports-Windows › dp › B017D51ZRQ
Amazon.com: DTECH 10 Feet USB 2.0 to RS232 DB9 Serial Port Adapter Cable with FTDI Chipset Supports Windows 11 10 8 7 and Mac Linux : Electronics
10ft DB9 RS232 to USB adapter with 9 pin male to USB-A male gold plated connector uses crystal clear blue enrich injection, strong and beautiful; active pins: 2(RXD), 3(TDX), and 5(GND)
AESwave
aeswave.com › usb-to-db9-female-for-use-with-cardaq-2-plus-2-plus-3-p10332.html
USB to DB9 Female for use with CarDAQ 2, Plus 2, Plus 3
USB to DB9 Female for use with CarDAQ 2, Plus 2, Plus 3
CablesAndKits
cablesandkits.com › mc › usb-to-db9 › fam-544 › fp-5406
CB-USBDB9 | Converter Cable | USB to Serial (DB9/Hex Nut)
USB to Serial (DB9/Hex Nut) Converter Cable
.diagramz { width: 100%; text-align: center; } .diagramz img { width: 90%; } .cols2 { -moz-column-count: 2; -moz-column-gap: 20px; -webkit-column-count: 2; -webkit-column-gap: 20px; column-count: 2; column-gap: 20px; } .cols3 { -moz-column-count: 3; -moz-column-gap: 20px; -webkit-column-count: 3; -webkit-column-gap: 20px; column-count: 3; column-gap: 20px; } .startheader { font-family: 'Roboto Condensed', Helvetica, Arial, sans-serif; width: 100%; font-weight: bold; color: #3B3B3B; font-size: 16px; } .miniheader { font-family: 'Roboto Condensed', Helvetica, Arial, sans-serif; width: 100%; font
Price $28.32
Best Buy
bestbuy.com › best buy › computers & tablets › computer accessories & peripherals › monitor & screen accessories › monitor & video cables
Insignia™ 1.3' USB to RS 232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
This Insignia NS-PU99501 cable allows you to connect a device with an RS-232 (DB9) serial port to a USB hub or USB-equipped PC or Mac and supports data transfer rates of more than 115 Kbps for rapid performance.
Published October 9, 2024
Cables
cables.com › … › home › networking accessories › serial adapters › usb to db9 male serial adapter with 6' cable
USB To DB9 Serial Adapter With 6 Ft Cable | Cables.com
MFG Part#: USB-DB9-6 · print · MFG part#: USB-DB9-6 SKU: USB-DB9-6 USB to DB9 Male Serial Adapter With 6' Cable · Description · The USB to Serial Converter is the easiest way to connect your serial device to the USB port on your PC or Mac.
Eaton
tripplite.eaton.com › products catalog › usb adapters › u209000r
USB-A to Serial Adapter Cable - RS232, DB9, 5-ft. | Eaton
5 ft. USB-A to RS-232 serial adapter cable with EMI/RFI protection connects your serial-based (DB9) PDU, switch or console server to your computer’s USB port.