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User Guide for StarTech 1P3FFCNB-USB-SERIAL USB to Null Modem Serial Adapter Cable

Quick-start guide for the StarTech USB to Null Modem Serial Adapter Cable. Includes driver installation steps for Windows and macOS, pinout diagrams, and verification procedures.

Quick answers from the manual

Quick answer

  • This guide provides instructions for installing the StarTech USB to Null Modem Serial Adapter Cable, including driver installation for Windows and macOS, and verification steps. p. 1, 2

Key actions

  • Install drivers p. 1
  • Verify driver installation p. 2

First start

  • Connect the adapter to a USB-A port after installing the necessary drivers. p. 1

Problems and fixes

Drivers do not install automatically

Download the driver package from the StarTech support website and run the setup file.

p. 1

Technical specifications

Parameter Value Meaning Pages
Pin 1 DCD Data Carrier Detect p. 1
Pin 2 TXD Transmit Data p. 1
Pin 3 RXD Receive Data p. 1

Where to find it in the PDF

  • Quick-Start Guide p. 1, 2
Table of contents

Manual images

Click an image to enlarge
Component and Function table Page 1 Pinout Diagram for RS-232 Page 1

Quick guide from the manual

This document provides instructions for the StarTech USB to Null Modem Serial Adapter Cable. It covers driver installation, hardware connection, and verification steps for Windows and macOS systems.

Package Contents

  • USB to Serial Adapter x 1
  • DB9 Nuts x 2
  • Quick-Start Guide x 1

Requirements

To use this adapter, you need a computer with an available USB Type-A port. Drivers should install automatically on most supported operating systems.

Installation

If drivers do not install automatically, follow these steps:

  1. Navigate to the product support page on the StarTech website (www.StarTech.com/1P3FFCNB-USB-SERIAL or www.StarTech.com/1P10FFCN-USB-SERIAL).
  2. Click the Drivers/Downloads tab.
  3. Download the appropriate Driver Package for your operating system.

Windows Installation

  1. Right-click the downloaded file and extract the contents using Extract All.
  2. Browse the Windows folder and run the Setup file.
  3. Follow the on-screen instructions to complete the installation.
  4. Connect the USB to Serial Adapter to an available USB-A port.

macOS Installation

  1. Double-click the downloaded file.
  2. Open the folder that matches your macOS version and run the Installer file inside the folder.
  3. Follow the on-screen instructions to complete the installation.
  4. Connect the USB to Serial Adapter to an available USB-A port.

Verifying Driver Installation

Windows

  1. Navigate to the Device Manager.
  2. Under Ports (COM & LPT), right-click COM Port and select Properties.
  3. Confirm that the driver is installed and working as expected.

macOS

  1. Navigate to System Information.
  2. Expand the Hardware section and click USB.
  3. Confirm that the COM Port appears in the list.

Component Overview

Component and Function table
Component and Function table
  • Serial Port DB9: Connects to a Serial Peripheral Device.
  • DB9 Screws: Used to secure the Serial DB9 Port to the peripheral device.
  • LED Indicators:
    • Data Receive LED: Flashes Green to indicate activity.
    • Data Transmit LED: Flashes Yellow to indicate activity.
    • USB LED: Solid Blue indicates driver is installed and USB connection is enumerated.
  • USB Type A Port: Connects the adapter to the computer.

Pinout Diagram

The adapter uses a standard RS-232 pin configuration:

Pinout Diagram for RS-232
Pinout Diagram for RS-232
  • Pin 1: DCD
  • Pin 2: TXD
  • Pin 3: RXD
  • Pin 4: DSR
  • Pin 5: GND
  • Pin 6: DTR
  • Pin 7: CTS
  • Pin 8: RTS
  • Pin 9: RI

Official resources from the manual

Official resource www.StarTech.com/1P3FFCNB-USB-SERIAL Official resource www.StarTech.com/1P10FFCN-USB-SERIAL

Practical help

Common problems

Drivers do not install automatically

Visit the StarTech support website, download the driver package for your OS, and manually run the setup or installer file.

Before use

  • Ensure you have a computer with an available USB Type-A port.
  • Identify the serial peripheral device to be connected.
  • Download the latest drivers from the StarTech support website if automatic installation fails.

Specs in practice

Data Receive LED
Flashes Green to indicate activity.
Data Transmit LED
Flashes Yellow to indicate activity.

Images and diagrams

  • The pinout diagram shows the 9-pin configuration for RS-232 communication.
  • The component diagram identifies the Serial Port DB9, DB9 Screws, LED indicators, and USB Type-A connector.

Model compatibility

  • Requires a USB Type-A enabled computer.
  • Compatible with serial peripheral devices.

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Manual page author

David Miller

Documentation analyst

Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.