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  • StarTech.com USB to RS232 DB9/DB25 Serial Adapter Cable ICUSB232DB25 (Grey)
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StarTech.com USB to RS232 DB9/DB25 Serial Adapter Cable ICUSB232DB25 (Grey)

79 customer reviews

List Price: $20.99
Price: $13.89 & FREE Shipping on orders over $35. Details
You Save: $7.10 (34%)
Only 4 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
DB9 or DB25
  • This versatile device ships with a 9-pin connector, and a 25-pin RS232 adapter for a variety of connection options
  • Integrated 3ft cable allows you to connect directly to your serial devices
  • Plug-and-Play/Hot-swap support enables you to add and remove this adapter without having to reboot the computer
  • USB powered; No external power adapters needed
  • Supports serial transfer speeds up to 250Kbps
  • Includes a DB9 to DB25 pin adapter for 25-pin RS232 serial communication
  • Supports USB transfer speeds up to 12Mbps
  • Plug-and-Play and Hot Swap Support
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Frequently Bought Together

StarTech.com USB to RS232 DB9/DB25 Serial Adapter Cable ICUSB232DB25 (Grey) + StarTech.com 10-Feet DB9 RS232 Serial Null Modem Cable F/F (SCNM9FF)
Price for both: $18.88

Buy the selected items together

Product Description

Style:DB9 or DB25

The ICUSB232DB25 USB to RS232 DB9/DB25 Serial Adapter Cable (M/M) lets you connect 9-pin (DB9) or 25-pin (DB25) RS232 serial devices to your laptop or desktop computer through a USB port, as though the computer offered an onboard serial port. The integrated 3-foot (0.9 meter) cable allows it to be connected directly from the serial device to the computer without requiring additional cables. A cost-effective solution that bridges the compatibility gap between modern computers and legacy serial peripherals, this high quality USB/RS232 Serial Adapter cable ships with a DB-9 to DB-25 adapter for connection to varied serial equipment. Backed by a StarTech.com 2-year warranty and free lifetime technical support.


Product Details

Style Name: DB9 or DB25
  • Item Weight: 3.2 ounces
  • Shipping Weight: 3.5 ounces (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B003WOWBBW
  • Item model number: ICUSB232DB25
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (79 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: July 12, 2010

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

18 of 19 people found the following review helpful By The Walsh's on August 23, 2012
Style Name: Null Modem Verified Purchase
This cable does not implement the full "null modem" specification. Specifically Pin 1 (CD) is not tied to Pin 6 (DSR).
The cable worked flawlessly with programs that do not use (or can be set to ignore) Pin 1.
However Microsoft Activesync and Windows Mobile Device Center do not fit into this category and would not work.

Technical support was very responsive but unable to resolve this major issue.
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7 of 7 people found the following review helpful By Mark Steven Kowalski on November 19, 2009
Style Name: 921.6 Kbps Baud Rate Verified Purchase
Although the printed manual does not specify, there is a driver for Vista. Didn't see any for W7.

But, the Vista install went fast and perfectly. When I connected the cable to a usb port, it turned up as COM3.

This product is perfect for my high-end laptop because it does not have a DB9 serial port. But, my hobbies and my job require that I be able to connect to a serial device using DB9 connectors.

Double-click my heels!
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5 of 5 people found the following review helpful By David on February 3, 2013
Style Name: Null Modem Verified Purchase
This is a great cable for prototyping if your board doesn't support a TTL connection. Being able to monitor if RX and TX are both working is very useful. If you always need a null modem for your designs because that is the way the plug is wired, this saves you the annoyance of needing an extra adapter. Especially nice if you have to travel often with cables as I do.
However, if your board/device does not have a crossover you should look for a cable without a null modem built in so you don't need a null modem adapter to "cross back" to get a direct connection.
Most importantly, this uses the rock solid FTDI FT232R chip which in my experience is by far the most reliable in terms of the chip itself and drivers for modern Windows(Vista+) versions vs the common Prolific and ATEN chip-sets found in most other cables like this.
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5 of 5 people found the following review helpful By Jeffrey A Siegel on December 16, 2012
Style Name: 921.6 Kbps Baud Rate Verified Purchase
I used this serial adapter to support legacy systems. It works well under both Windows 7 and Virtual Box software. I often use Windows XP in a Virtual Box virtual machine (VM). You can attach this USB device to the VM. This allows me to run legacy software that will only work with XP and use a serial port.
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4 of 4 people found the following review helpful By RFinCC on May 26, 2012
Style Name: 921.6 Kbps Baud Rate Verified Purchase
With my new motherboard I no longer had any com ports and only USB ports. Bought the ICUSB232Pro from [...] and this USB to RS232 Serial Adapter Cable did the trick and ended all my problems. Works great in both Windows 7 Home Premium and Professional in 32 and 64 bit. Comes with drivers or just go to their web site and download their latest.
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3 of 3 people found the following review helpful By S. Honaker on December 23, 2011
Style Name: 921.6 Kbps Baud Rate Verified Purchase
We use this with multiple laptops that download from GPS units and need to be reliable and simple. Telling people how to use Device Manager to find where the USB-Serial adapter went doesn't cut it. I can now configure the machines once and know it'll work every time. It installed perfectly on Windows XP, Windows 7 32-bit and Windows 7 64-bit. The fact that it arrives packed in an anti-static bag inside a cardboard box makes it clear it's not the typical cheap blister pack unit.
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3 of 3 people found the following review helpful By Randall D. Watson on September 9, 2014
Style Name: Null Modem Verified Purchase
I used this to connect to the serial console on a NetGate pfSense appliance. Should I ever accidentally lock myself out of the web administration GUI this is the only way to access it. Connected via PuTTY in a Windows 7 virtual machine in VMware Fusion on a late-2013 MacBook Pro. If it works with that setup it will likely work with anything.
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3 of 3 people found the following review helpful By Jimmy Blue on March 26, 2014
Style Name: Null Modem Verified Purchase
I needed this cable to run a virtual screen for my new Uniden scanner that has a major bug in the front usb port, By using this cable on the rear GPS port, i was able to run my virtual screen with no problems at all.
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Most Recent Customer Reviews

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StarTech.com USB to RS232 DB9/DB25 Serial Adapter Cable ICUSB232DB25 (Grey)
This item: StarTech.com USB to RS232 DB9/DB25 Serial Adapter Cable ICUSB232DB25 (Grey)
Price: $13.89
Ships from and sold by Amazon.com
Want to discover more products? Check out these pages to see more: 6ft usb to db9 cables, usb serial rs232, com port serial cable