Monoprice

Monoprice 100465 DB9 Female to DB25 Male Modem Cable - 25ft

4.4 (13 reviews)

Reliable Serial Communication for Legacy Devices Overview This Monoprice molded modem cable provides a dependable connection between older PCs and external modems. Featuring a DB9 female connector on one end and a DB25 male connector on the other, this cable ensures seamless communication with ro...

$11.99*
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*Price sourced from Amazon.com. Last updated:Jul 15, 2026.Price and availability are subject to change.

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Overview

Reliable Serial Communication for Legacy Devices

Overview

This Monoprice molded modem cable provides a dependable connection between older PCs and external modems. Featuring a DB9 female connector on one end and a DB25 male connector on the other, this cable ensures seamless communication with robust construction.

Specifications

  • Connector 1: DE-9 (DB-9) Female
  • Connector 2: DB-25 Male
  • Wiring: * DE-9 Pin 1 to DB-25 Pin 8 (Data Carrier Detect - DCD)
  • DE-9 Pin 2 to DB-25 Pin 3 (Receive Data - RD or Rx)
  • DE-9 Pin 3 to DB-25 Pin 2 (Transmit Data - TD or Tx)
  • DE-9 Pin 4 to DB-25 Pin 20 (Data Terminal Ready - DTR)
  • DE-9 Pin 5 to DB-25 Pin 7 (Signal Ground - SGND or Gnd)
  • DE-9 Pin 6 to DB-25 Pin 6 (Data Set Read - DSR)
  • DE-9 Pin 7 to DB-25 Pin 4 (Request To Send - RTS)
  • DE-9 Pin 8 to DB-25 Pin 5 (Clear To Send - CTS)
  • DE-9 Pin 9 to DB-25 Pin 22 (Ring Indicator - RI)
    • Cable Length: 25 Feet
    • Connectors: Molded with thumbscrews
  • Key Features

    This cable features a female DE-9 (DB-9) socket on one end and a male DB-25 plug on the other

    The 9 pins of the DE-9 connector are wired to 9 of the pins on the DB-25 connector

    While legacy PCs (post IBM PC/AT) typically use 9-pin RS-232 plugs external modems are usually equipped with 25-pin RS-232 sockets

    Quality at a Fair Price: Monoprice's rugged design and rigid quality control standards deliver high quality products at fair prices

    Specifications

    Connector 1
    DB9 Female
    Connector 2
    DB25 Male
    Cable Length
    25 ft
    Pin Wiring
    9 pins of DE-9 connected to 9 pins of DB-25
    Compatibility
    External modems (25-pin RS-232 sockets) and legacy PCs (9-pin RS-232 plugs)

    Pros & Cons

    👍 Pros

    • Features a specific DE-9 (DB-9) female connector, suitable for legacy PC connections.
    • Includes a DB-25 male plug, aligning with common external modem requirements.
    • The 25-foot length provides considerable reach for connecting devices in varied setups.
    • Designed with nine pins wired between the DE-9 and DB-25 connectors for specific data transfer.
    • Constructed to Monoprice's quality control standards, indicating durable manufacturing.

    👎 Cons

    • The specific pinout configuration beyond the nine connected pins is not detailed.
    • This cable is primarily designed for legacy RS-232 connections, limiting modern compatibility.
    • The cable's length might be excessive for some setups, potentially leading to cable management issues.
    • It does not specify any shielding or protection against electromagnetic interference.
    • Compatibility with non-modem RS-232 devices is not explicitly stated.

    Frequently Asked Questions

    This cable is equipped with a female DE-9 (DB-9) socket on one end and a male DB-25 plug on the other.
    This cable is designed to connect legacy PCs, which often use 9-pin RS-232 plugs, to external modems that are typically equipped with 25-pin RS-232 sockets.
    The Monoprice 100465 DB9 Female to DB25 Male Modem Cable has a length of 25 feet.
    Nine pins of the DE-9 connector are wired to nine corresponding pins on the DB-25 connector.
    This cable is primarily intended for legacy RS-232 serial connections, which are less common with modern computer peripherals.