DB9 Female to DB25 Male AT Modem Serial Cable


Connect External Modem to PC Port | Fully Molded | Thumbscrews | AT Modem Pinout

Serial Cables - 6FT DB9 Female to DB25 Male AT Modem Cable

AT Modem Cables are fully molded. This design ensures long lasting data integrity, regardless of modem baud rates. The hoods have office quality appearance with long, easy-grip, slotted thumbscrews for neat and easy connections, all with industrial strength robustness.


  • Connector A: DB9 Female
  • Connector B: DB25 Male
  • Fully molded connectors
  • Includes Thumbscrews
  • Connect a PC computer to an external modem via the DB9 serial port
1 8 Data Carrier Detect (DCD)
2 3 Receive Data (RD or Rx)
3 2 Transmit Data (TD or Tx)
4 20 Data Terminal Ready (DTR)
5 7 Signal Ground (SGND or Gnd)
6 6 Data Set Read (DSR)
7 4 Request To Send (RTS)
8 5 Clear To Send (CTS)
9 22 Ring Indicator (RI)
Write Your Own Review
You're reviewing:DB9 Female to DB25 Male AT Modem Serial Cable
Your Rating

Proposition 65

WARNING: This product can expose you to chemicals including phthalates, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov


Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment in the European Union.  It stands for Restriction of Hazardous Substances Directive.

REACH, a European Union regulation addresses the production and use of chemical substances and their potential impacts on both human health and the environment.  It stands for Registration, Evaluation, Authorisation, and Restriction of chemicals.


The WEEE Directive set collection, recycling and recovery targets for all types of electrical goods in the European community.  It stands for Wate Electrical and Electronic Equipment Directive.

* The following information is for information purposes only.  It does not guarantee that the product adheres to the following standards.  Please check the product description for specific certifications.

Q: What is a null modem cable?

A: A null modem cable connects to two standard serial ports for networking two computers together. Null modem cables enable direct data transfer with minimum setup. Null modem cables reverse the transmit and receive lines on each end of the cable to enable direct two-way communication. A null modem cable for PCs ordinarily follows the RS-232 standard and uses the same serial ports as RS-232 cables.

Q: What is the difference between a DB15 and HD15 connector?

A: A DB15 connector has 15 pins arranged in two rows with one row on top of the other. The top row has 8 pins and the lower row has 7. A DB15 connector can be found on sound cards older AUI network cards and devices as well as legacy Macintosh® monitors.

A: An HD15 connector has 15 pins arranged in three rows. Each row has 5 pins with the middle row slightly offset from the top and bottom. A HD15 connector is sometimes called HD DB15 or VGA connector. The HD15 connector is a very common connector used mostly as a video interface for computers and monitors. It can also be found on HD displays and on older HD source devices such as satellite receivers and cable boxes.

What is a Parallel Cable?

A: A parallel cable is used to connect to the parallel ports on a computer and a peripheral device like a printer or external drive. IBM originally developed parallel ports and cables as a mean for connecting a printer to the earliest personal computers.

Features & Specs
Connector A:Type of Connector on Side A of the adapter?DB9 Female
Connector B:Type of Connector on Side B of the adapter?DB25 Male

LengthOverall length of cable?1 Foot
Pinout Pinout is a term used in electronics to describe how an electrical cable is wired