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User Guide for StarTech.com USB to Null Modem Serial Adapter Cable

Quick-start guide for the StarTech.com USB to Null Modem Serial Adapter Cable. Includes installation steps for Windows and macOS, driver setup, pinout diagram, and component overview.

Quick answers from the manual

Quick answer

  • This guide covers the installation and verification of the StarTech.com USB to Null Modem Serial Adapter Cable, including driver setup for Windows and macOS. p. 1, 2

Key actions

  • Download drivers from the StarTech.com support website if they do not install automatically. p. 1

First start

  • Connect the adapter to a USB-A port. If drivers do not install automatically, download the driver package from the support website. p. 1, 2

Problems and fixes

Driver installation failure

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

p. 2

Technical specifications

Parameter Value Meaning Pages
Pin 2 TXD Transmit Data p. 1

Where to find it in the PDF

  • Quick Start Guide and Components p. 1
  • Installation and Verification p. 2
Table of contents

Manual images

Click an image to enlarge
DB9 Pinout Diagram Page 1 Component Identification Page 1

Quick guide from the manual

This document provides instructions for the StarTech.com USB to Null Modem Serial Adapter Cable. The device allows you to connect a serial peripheral device to a computer via a USB-A port. Drivers typically install automatically, but manual installation steps are provided for Windows and macOS.

Components

Component Identification
Component Identification
  • Serial Port DB9: Connects to your serial peripheral device.
  • DB9 Screws: Used to secure the connection.
  • LED Indicators: Data Receive (Green), Data Transmit (Yellow), and USB (Blue) for status monitoring.
  • USB Type A Port: Connects to the computer.

Installation

Drivers should install automatically on most operating systems. If they do not, follow these steps:

  1. Visit the support website at www.startech.com/support and navigate to the product page for your specific model (e.g., 1P1FFCN-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 select Extract All.
  2. Browse to the Windows folder and run the Setup file.
  3. Follow the on-screen instructions.
  4. Connect the adapter to an available USB-A port.

macOS Installation

  1. Double-click the downloaded file.
  2. Open the folder matching your macOS version and run the Installer file.
  3. Follow the on-screen instructions.
  4. Connect the adapter to an available USB-A port.

Verifying Installation

Windows: Navigate to Device Manager, expand Ports (COM & LPT), right-click the COM Port, and select Properties to confirm the driver is working.

macOS: Navigate to System Information, expand the Hardware section, and click USB to confirm the COM Port appears in the list.

Pinout Diagram

The DB9 connector pinout is as follows:

DB9 Pinout Diagram
DB9 Pinout Diagram
  • 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 StarTech.com Official resource www.startech.com/support

Practical help

Common problems

Driver not installing automatically

Download the specific driver package for your OS from the StarTech.com support website and run the installer manually.

Device not recognized

Check Device Manager (Windows) or System Information (macOS) to verify the COM port is listed.

Before use

  • Ensure you have a USB Type-A enabled computer.
  • Identify your specific model number (e.g., 1P1FFCN-USB-SERIAL).
  • Have the serial peripheral device ready for connection.

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 illustrates the 9-pin configuration of the DB9 connector, mapping each pin to its corresponding RS-232 signal.

Model compatibility

  • Requires a USB Type-A port.
  • Compatible with Windows and macOS operating systems.

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Manual page author

Michael Turner

Technical manual editor

Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.