Black Box EGM25C-MF 25-Conductor RS-232 Thumbscrew Cable with EMI/RFI Hood
The Black Box EGM25C-MF RS-232 thumbscrew cable is engineered for mission-critical data transmission in electromagnetically noisy industrial and commercial environments. This 25-conductor Extended-Distance/Quiet (ED/Q) cable delivers reliable serial communications with superior signal integrity, making it ideal for legacy systems, industrial automation, medical equipment, and telecommunications infrastructure requiring robust EMI/RFI protection. Available in custom lengths including 500-foot configurations, this cable eliminates signal degradation and connection failures caused by electromagnetic interference.
Key Features
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25-Conductor Configuration — Full-pin DB25 male/female connectivity for complete signal path integrity
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Extended-Distance/Quiet (ED/Q) Technology — Optimized for long-run installations with noise immunity
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Nonremovable EMI/RFI Hoods — Permanent electromagnetic shielding prevents signal loss and crosstalk
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24 AWG Stranded Copper Conductors — Superior flexibility and durability for frequent movement and installation
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Thumbscrew Connectors — Tool-free secure fastening ensures reliable connections without slippage
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Custom Length Options — Available in 500-foot and other configurations for exact installation requirements
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RS-232 Serial Standard Compliant — Guaranteed compatibility with legacy and modern serial devices
Technical Specifications
| Specification |
Details |
| Manufacturer |
Black Box |
| Part Number |
EGM25C-MF-500 |
| Connector Type |
DB25 Male/Female with Thumbscrews |
| Conductor Count |
25-Conductor |
| Conductor Gauge |
24 AWG Stranded Copper |
| Cable Technology |
Extended-Distance/Quiet (ED/Q) |
| EMI/RFI Protection |
Nonremovable Hoods |
| Standard |
RS-232 Serial |
| Length |
500 Feet |
| Application |
Industrial Automation, Telecommunications, Medical Equipment, Legacy Systems |
Frequently Asked Questions
What is an RS-232 thumbscrew cable used for?
RS-232 thumbscrew cables like the Black Box EGM25C-MF connect serial devices such as industrial controllers, modems, terminals, and legacy computer equipment. The thumbscrew design provides secure, tool-free connections ideal for environments requiring frequent connections and disconnections without signal loss.
Why do I need EMI/RFI shielding on a 25-conductor cable?
EMI/RFI hoods protect against electromagnetic interference from motors, power lines, and wireless equipment. The nonremovable hoods on this cable ensure consistent shielding throughout the installation, preventing data corruption and communication failures in noisy industrial environments.
Can this 25-conductor cable be used for long-distance runs?
Yes. The Extended-Distance/Quiet (ED/Q) technology and 24 AWG stranded copper conductors are specifically designed for long-run installations. The 500-foot variant maintains signal integrity over extended distances without amplification or repeaters.
Is the Black Box EGM25C-MF compatible with modern systems?
This RS-232 thumbscrew cable maintains full compatibility with any device featuring DB25 serial ports, including legacy systems, industrial PLCs, medical devices, and specialized telecommunications equipment. It's ideal for retrofitting and maintaining existing infrastructure.
