StarTech. com SCNM9FF25 Cross Wired Serial Null Modem Cable - 25 ft DB-9 Female to Female - Gray
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Product Features
Technical Overview
This serial null modem cable employs a cross-wired pin configuration that enables direct communication between two DTE (Data Terminal Equipment) devices. The 25-foot length offers substantial reach for installations where equipment spacing is necessary, while the DB-9 female connectors ensure compatibility with standard serial ports.
The cable's shielding provides protection against signal degradation in electrically noisy environments, maintaining data integrity during transmission. With support for PC and modem connections, it serves as a versatile solution for serial communication needs across different hardware platforms.
This section brings together practical product details such as Cable Type, Cable Length, Connector Type on First End, Color Family, so buyers can judge configuration, deployment fit, and day-to-day suitability with less guesswork.
A strong technical summary explains how the product's interfaces, hardware profile, and operating characteristics work together in real deployment. Buyers often need this context to confirm compatibility with existing devices, expected performance in daily use, and whether installation will be straightforward for IT staff or end users.
Key Product Advantages
This cable delivers reliable serial connectivity with several distinct advantages for professional installations.
These strengths make the product easier to deploy and manage in real environments, especially where reliability, usability, and day-to-day operational continuity matter. Notable benefits include Direct Device Communication, Professional Build Quality.
Direct Device Communication
The cross-wired null modem configuration eliminates the need for intermediate modems or adapters, enabling straightforward serial connections between compatible devices.
- Connects two DTE devices directly
- Simplifies serial communication setup
- Reduces equipment requirements
Professional Build Quality
Constructed with shielding and durable materials, this cable maintains signal integrity and withstands regular use in demanding environments.
- EMI/RFI protection
- Long-distance capability
- Industrial-grade reliability
Deployment / Use Cases
The SCNM9FF25 serial null modem cable supports various deployment scenarios where legacy serial communication remains essential. Its 25-foot length and female connectors make it particularly suitable for installations requiring distance between connected devices.
Common applications include connecting industrial control systems to monitoring PCs, linking serial printers to point-of-sale terminals, establishing communication between legacy modems and computer systems, and interfacing with laboratory or medical equipment that utilizes serial ports. The cable's shielding ensures reliable operation even in environments with electrical interference.
This section brings together practical product details such as Cable Type, Cable Length, Connector Type on First End, Color Family, so buyers can judge configuration, deployment fit, and day-to-day suitability with less guesswork.
Industrial Control Systems
Connect PLCs, HMIs, and other industrial equipment to monitoring stations for data collection and control functions.
Legacy Office Equipment
Interface with serial printers, barcode scanners, and older peripherals that still rely on DB-9 connections.
Physical Profile
This gray serial cable measures 25 feet in length with a weight of approximately 10.76 ounces. The DB-9 female connectors feature standard pin configurations compatible with most serial ports. The cable's flexible construction allows for routing through conduits, under desks, or along walls while maintaining reliable connectivity.
The physical profile is practical for deployment planning because the dimensions and weight are clearly defined: 10.76 oz (305 g). This helps confirm rack, shelf, desk, or cabinet fit before installation.
- Weight
- 10.76 oz (305 g)
- Length
- 25 ft (7.62 m)
Highlights
- 25-foot cross wired serial null modem cable
- DB-9 female connectors on both ends
- Shielded construction for EMI protection
- Compatible with PCs and modems
- Gray color for neutral appearance
- RoHS compliant for environmental safety
- Lifetime warranty from StarTech.com
- Easy plug-and-play installation
Specifications
| Specifications | |
|---|---|
| Manufacturer | StarTech.com |
| Manufacturer Part Number | SCNM9FF25 |
| Brand Name | StarTech.com |
| Product Name | 25ft Cross Wired Serial Null Modem Cable |
| Packaged Quantity | 1 Each |
| Product Type | Data Transfer Cable |
| Technical Information | |
| Cable Type | Serial |
| Cable Length | 25 ft (7.62 m) |
| Connector Type on First End | DB-9 Serial - Female |
| Connector Gender on First End | Female |
| Connector on First End Details | 1 x 9-pin DB-9 Serial - Female |
| Connector Type on Second End | DB-9 Serial - Female |
| Connector Gender on Second End | Female |
| Connector on Second End Details | 1 x 9-pin DB-9 Serial - Female |
| Shielding | Yes |
| Device Supported | PC,Modem |
| Physical Characteristics | |
| Color Family | Gray |
| Product Color | Gray |
| Weight (Approximate) | 10.76 oz (305 g) |
| Miscellaneous | |
| Environmentally Friendly | Yes |
| Environmental Certification | EU RoHS |
| Environmental Compliance | Restriction of Hazardous Substances (RoHS) 2,Registration, Evaluation, Authorization and Restriction of Chemicals (REACH),Waste Electrical and Electronic Equipment Directive (WEEE) |
| Country of Origin | China |
| Warranty | |
| Limited Warranty | Lifetime |
User Manual
FAQ
What is a null modem cable and how does it differ from a standard serial cable?
A null modem cable is specifically cross-wired to connect two DTE (Data Terminal Equipment) devices directly without requiring a modem. Unlike standard straight-through serial cables that connect DTE to DCE (Data Communications Equipment), this cable swaps the transmit and receive lines along with handshaking signals, enabling direct communication between computers, printers, or other serial devices.
What devices can I connect with this DB-9 serial null modem cable?
This cable supports connections between PCs and serial printers, modems, or other equipment with DB-9 serial ports. It's commonly used for industrial control systems, legacy office equipment, point-of-sale terminals, and any application requiring direct serial communication between two devices without intermediate hardware.
Why is this cable shielded and what benefits does that provide?
The shielding protects against electromagnetic interference (EMI) and radio frequency interference (RFI), which can cause data corruption or signal loss in electrically noisy environments. This ensures reliable data transmission over the 25-foot length, making the cable suitable for industrial settings, offices with multiple electronic devices, or installations near power sources.
What is the significance of the 25-foot cable length?
The 25-foot length provides substantial reach for installations where connected devices are physically separated. This allows flexibility in equipment placement for industrial setups, office configurations, or any scenario requiring distance between serial devices while maintaining direct connectivity without signal repeaters or extenders.
What environmental certifications does this cable have?
This cable is EU RoHS compliant, meaning it restricts hazardous substances like lead, mercury, and cadmium. It also meets REACH and WEEE directives for chemical safety and electronic waste management. These certifications ensure the product meets international environmental standards for manufacturing and disposal.
What warranty coverage does StarTech.com provide for this cable?
StarTech.com backs this serial null modem cable with a lifetime warranty, covering defects in materials and workmanship for the product's usable life. This warranty reflects the manufacturer's confidence in the cable's durability and provides long-term assurance for professional installations where reliability is essential.
What refresh rate or brightness details are available?
Display-oriented products are best judged through screen, connectivity, and installation specifications. Those facts help buyers confirm visual fit, mounting flexibility, and deployment suitability more clearly than generic summary text.
What input or connectivity options are listed?
Connectivity options include DB-9 Serial - Female, helping the product integrate into common office or home setups.
| Qty | Price | Available |
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