Sewell InstaCOM USB to Serial Adapter 2 ft, with Posts

Sewell Part # SW-1301

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4.7 (193 reviews)

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ETA: 7/22/2019

  • 1+   $11.45

  • 3+   $10.95

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Starting from: $11.21

"As advertised and shipping was fast!!!"


This adapter is the easiest way to add a serial port to your computer. Many PDAs, digital cameras, GPS units, barcode scanners, and other equipment require a serial connection and many newer computers don't have serial ports.

This product has posts to attach, need USB to serial 2ft with screws instead?

USB to Serial Diagram

The cable is two feet long. If you are looking for a longer USB to Serial adapter add a USB extension cable or a standard serial cable to your order. If you don't want any attached cable, check out the Plug-in version.

What if I need to use a USB device with a computer that only has serial ports? Then you will need to add a USB 2.0 PCI Card.

The adapter works with 9-pin serial devices. Click here if you need a 25-pin adapter.

If you need a USB to DB9 Female, you can change the serial end with a Female to Female gender changer

Need a manual serial switch?

Get a USB to Serial adapter with standard thumbscrew connectors so you can make sure you have a secure connection that won't accidentally come apart.


Mfg. Part Number

  • SW-1301


  • Sewell

System Requirements

  • Windows 98 SE, ME, 2000, XP, Vista 32, Vista 64, 7, 8 & 10 (with latest driver download)
  • Linux
  • Mac OS X
  • Pentium 233 MHz or faster
  • 64 MB RAM or more
  • Available USB Port


  • USB Type A Male
  • 9-pin Serial Male


  • 2 feet


  • Bus Powered (no external power required)

Other Technical Info

  • Supports RS232 serial interface
  • USB 1.1 compliant
  • Works with USB 1.1, 2.0, and 3.0 ports (runs at USB 2.0 speeds on 3.0 ports)
  • USB suspend condition
  • Supports 500 Kbps transfer rate
  • Advanced 16 Bit processor for USB transaction and control data processing
  • PL 2303HX Chipset

Package Contents

  • USB to Serial adapter


  • Drivers and Support pages available under the support tab
  • Note for Mac users: Mac OS High Sierra 10.13 introduces a new feature that requires user approval before loading new third-party kernel extensions.
  • Go to System Preferences - Security & Privacy and click Allow to download drivers.


193 Total Reviews -

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(162) 83.9 %
(23) 11.9 %
(2) 1.0 %
(2) 1.0 %
(4) 2.1 %

Not Rated

(0) 0.0 %

Have experience with this product?

Most helpful reviews

Very Handy

Dchilli - 5/19/2008 12:51:08 PM

23 found this review helpful

Pros: Easy to install. No problems at all.

Cons: I have not found any.

Other: This is great for newer systems that do not have serial ports.

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Instant serial port

Randy - 5/15/2008 8:18:13 AM

19 found this review helpful

Pros: Reliable install in 98 to win XP. Each adapter maintains the eame comport number even when mulitple are installed. They are absolutely plug and play. The jack end has nuts that allow easy install to a screw in db9f adapter. I love em and have bought about 25.

Cons: None so far.

Other: This company ships very fast, even when you use their free shipping.

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USB to Serial Adapter

Bro - 2/28/2009 3:00:34 PM

6 found this review helpful

Pros: It fits the need. I purchased a new laptop and didn't notice that it didn't have a serial port. I either had to purchase a new scanner or this adapter. It is a no brainer.

Cons: I haven't found any yet.

Other: I only wish that I noticed the USB to parallell port adapter Sewell sells when I ordered this one and ordered both at the same time. OH well next time.

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Most recent reviews

Sewell USB to Serial Adapter review

- 3/2/2018 7:13:52 AM

It works.

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Slicker than grease

BNR32 - 11/5/2017 6:46:22 PM

works perfectly and included a disk of drivers

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- 7/31/2017 10:38:12 AM

Fast shipping

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usb to serial

- 1/25/2017 6:47:40 PM

reasonably priced item that works exactly as advertised. Driver installed easily; worked with freebie terminal emulator, Realterm.

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USB to Serial

GeneR - 10/23/2014 11:26:57 AM

Very High Quality Product!!!

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See all 54 questions


Does this adaptor come with drivers for Vista?


Yes this adapter includes drivers for use in Windows Vista.

33 out of 47 found this helpful.

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Does this product support usb 2? thanks.


Yes, the USB to Serial adapter will work in a USB 2.0 port. However, It does not require a USB 2.0 port due to the fact that the serial connection is much slower than USB 1.1 anyway. It will work fine on either a USB 2.0 or a USB 1.1 type port.

22 out of 28 found this helpful.

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Does this device create a COM1 or COM2 port?


Yes, if it does not automatically assign the port as COM1 or COM2 when you plug in the cable, you can manually assign it to COM1 or COM2 in the device manager.

20 out of 38 found this helpful.

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Sewell InstaCOM USB to Serial Adapter 2 ft, with Posts


Driver Downloads

Windows XP/Vista/7/8 - Previous driver for Windows XP, Vista/7/8, Server 2008/Server2008R2/Server2012

Windows Driver - Version 1.8 Compatible with Windows 10, 8, 7, Vista, and XP

OS X Driver - MAC OS X

Documentation Download

User's Manual - SW-1301