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USB to RS232 DB9 male(Serial) / DB25 male Converter Cable
In Stock This item will ship on 11/30/2015 if ordered within 1 days 7 hours 6 minutes

0.59 lbs

Flat Rate Shipping Prices

  • 0-3lbs- $4.99

USB to RS232 DB9 male(Serial) / DB25 male Converter Cable


  • Length: 70 inches
  • Connectors: One USB-A to DB9 Male and DB25
  • Supports automatic handshake mode
  • Over 1Mbps data transfer rate
  • Supports remote wake-up and power management
  • 96-byte buffer each for upstream and downstream data flow
  • Easy installation
  • Works with cellular phones, PDA, digital cameras, modems, and ISDN terminal adapters
  • Frees your RS-232 ports for other uses
  • No IRQs, no IRQ conflicts
  • Requires Microsoft Windows 98, Me, NT, 2000, XP, Vista, Windows 7 (32 and 64)

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55 Reviews

75.64% of the reviewers recommend this product


questionable drivers at best or bad serial implementation

  • Anonymous,
  •  Chico, CA 
  • 10/14/2015 3:39:04 PM

Pros: Comes with a db9 to db25 adapter

Cons: Doesn't Work, Might be a driver issue or just a bad cable.

I was looking for a lower cost alternative to the SIIG cable I usually buy which I have yet to find an obscure device that it wont work with. However this cable, labeled as being from BYTECC just doesn't seem to want to work. I bought it hoping to retrofit an older set of US Robotics serial modems. The modems are known good. I confirmed that the db9 to db25 adapter works fine with my SIIG cable so that's not the problem. I was looking to use these under Windows Server 2012 R2 but no luck. It doesn't seem to matter what drivers are used, I cannot communicate with any device attached to it. It is not flagged in device manager. It simply doesn't work. So I also tested this Bytecc cable on some test-bed systems to at least determine whether the cable was working or not on any OS in case there were any issues with newer operating systems. I tested it under Windows XP, Vista, and windows 7 all yielding the same results as under 2012 . I tested each using both the provided drivers and the current drivers bundle directly from prolifics website all with the same results. This cable is identified as Prolific chip PL2303-TA by prolifics chip id tool.

by Monoprice Administrator

Thank you for your review and my apologies for the issues you have experienced with PID 2067. Unfortunately, it sounds like you may have received a defective product. Since it is not working in windows XP, Vista or 7. Now if you’d like, I can help setup an RMA for a replacement. If you would like me to proceed with the RMA, just let me know and I can get this started right away. Sorry again for the trouble and hope this helps!

Mark P.
Tech Support Associate
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  • Dave,
  •  ,  
  • 3/20/2015 9:02:03 AM

Pros: Worked for what I was trying to do.

Converter worked as advertised, I have no complaints

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USB Cables works, but the wrong adaptor was sent

  • Joshua Herald,
  •  Columbus, OH 
  • 1/23/2015 2:13:18 PM

Pros: The USB cable with the DB9 RS-232 male serial connector worked fine. The drivers installed automatically and Windows 7 treats it like a normal COM port. The material seems of decent quality too.

Cons: The included DB9 to DB25 adaptor is the wrong type for communicating with devices.

I ordered this product for the specific use of connecting to RS-232 devices with female DB25 inputs. After connecting everything and installing drivers, I was not able to get the computer to communicate with a printer I had connected. After a day of troubleshooting the drivers and the cable, I discovered the culprit was an incorrect DB9 to DB25 adaptor. Testing the adaptor with a multimeter revealed that it's not a null modem pinout configuration. Null modem cables (and adaptors) are used to communicate with devices directly, rather than pass the signal through. Users simply connecting using the USB-DB9 cable would not have this problem.

I have used a custom breakout cable to achieve the correct pin configuration, but I'm still in need of the correct adaptor for a permanent connection.

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Works fine. Dells on Server 2012R2

  • Anonymous,
  •  Northfield, OH 
  • 12/27/2014 12:47:23 PM

Pros: Effective and inexpensive.

Cons: none. cheap and works fine. hardest part was opening the %^$% plastic sealed package.

We have Dell servers. We had been using rs232 to connect our older dells to our Cisco & Dell switches, routers and firewalls. We needed a replacment that worked with the newer servers. We never did try the disk that came with it. On older equipment running 2003 we use "terminal". On Server 2012 R2, we use good ol' Putty to connect to the serial ports with this attached. Shows as "comm1"

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Essential Item for any Tech's Kit

  • williakz,
  •  Shoal Creek, AL 
  • 12/1/2014 10:41:55 AM

Pros: - Superior construction
- Variety of drivers available
- Attractive connectors and cabling

Cons: None

This USB-to-RS232 cable is the core item in provisioning a full RS232 serial port communication capability for your PC, Mac, or laptop. Note that RS232 is no longer routinely provided in most electronic components in favor of Bluetooth, WiFi, Ethernet, USB, or other communication interfaces. That said, RS232 is still widely encountered in current industrial applications, custom audio-visual control applications, and especially when dealing with older, still useful devices of various makes, models, and applications. In order to connect and communicate successfully with the various RS232 connectors found in the field, this comm cable only requires the addition of a few other Monoprice items:

Item 1170 - Gender changer for 25-pin connectors
Item 1186 - Gender changer for 9-pin connectors
Item 1203 - Null modem adapter (9-pin)

With the addition of these three adapters, there is no DB9 or DB25 serial connection to a USB port that cannot be made. In conclusion, an investment of less than $15 will provide any tech with a bulletproof capability to deal with RS232 communication challenges whenever and wherever they appear. Nice job, Monoprice!

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