1. Product Overview
Product Name: Cable DB37m to 4×DB25m
Model: A400
Series: A400 Connectivity Series
Article Number: A400
Manufacturer: Rayon

The Rayon A400 is a high-quality multi-connector interface cable designed to provide reliable signal transmission between a DB37 male connector and four DB25 male connectors. Engineered for industrial, laboratory, and data communication applications, this cable serves as a compact and efficient solution for connecting multi-channel devices, control systems, or communication interfaces that require parallel or serial data distribution. With a total length of 0.2 meters, the A400 offers a short, low-loss connection ideal for rack-mounted or closely positioned equipment where minimal cable slack is desired.

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2. Key Features
- Multi-Connector Interface: One DB37 male connector branching into four DB25 male connectors, enabling simultaneous connection of multiple devices or channels.
- Compact Length: 0.2-meter (20 cm) cable length minimizes signal degradation and clutter, ideal for confined installations.
- High Signal Integrity: Designed for stable electrical performance with minimal crosstalk and interference.
- Durable Construction: Manufactured with robust materials to ensure long-term reliability in demanding environments.
- Precision-Molded Connectors: Each connector is molded for strain relief and mechanical stability, reducing wear and tear from frequent plugging and unplugging.
- Versatile Application: Suitable for data acquisition systems, industrial automation, test equipment, and communication interfaces.
- Plug-and-Play Compatibility: Standard D-subminiature connectors ensure compatibility with a wide range of devices and interface cards.
- Optimized for Short-Distance Interconnects: The 0.2 m length is ideal for internal cabinet wiring or close-proximity device interconnections.

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3. Technical Specifications
- Product Type: Multi-connector interface cable
- Model / Article Number: A400
- Manufacturer: Rayon
- Connector Type (Primary): DB37 male (37-pin D-sub)
- Connector Type (Secondary): 4 × DB25 male (25-pin D-sub)
- Number of Connectors: 5 total (1 input, 4 outputs)
- Cable Length: 0.2 meters (20 centimeters)
- Cable Diameter: Approx. 6–8 mm (typical for multi-core D-sub cables)
- Conductor Material: Tinned copper (assumed standard for signal cables)
- Insulation Material: PVC or equivalent high-durability polymer insulation
- Outer Jacket Material: Flexible PVC or polyurethane (PU) for abrasion resistance
- Color: Typically black or gray (standard industrial color scheme)
- Shielding: Foil and/or braided shielding for EMI/RFI protection (typical for D-sub cables)
- Operating Temperature Range: -20°C to +75°C (typical for PVC-jacketed cables)
- Contact Plating: Gold or nickel-plated contacts for corrosion resistance and improved conductivity
- Pin Configuration: Standard D-sub pinout, DB37 to four DB25 parallel mappings (specific wiring dependent on application)
- Weight: Approx. 150–250 g (depending on cable gauge and shielding)

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4. Functionality
The Rayon A400 cable functions as a breakout or distribution cable, converting a single DB37 male interface into four separate DB25 male interfaces. This configuration allows a single multi-channel port to communicate with multiple peripheral devices or subsystems.

How It Works:
- The DB37 male connector serves as the primary interface, typically connected to a controller, data acquisition card, or communication hub.
- Internally, the cable routes specific signal lines from the DB37 connector to each of the four DB25 connectors according to a defined pin mapping.
- Each DB25 male connector can then be connected to a corresponding device, such as a measurement instrument, actuator, or communication module.

Use Cases and Applications:
- Industrial Automation: Connecting PLCs (Programmable Logic Controllers) to multiple I/O modules.
- Data Acquisition Systems: Distributing analog or digital signals from a DAQ card to multiple sensors or instruments.
- Test and Measurement: Linking test benches or signal analyzers to multiple DUTs (Devices Under Test).
- Communication Systems: Splitting or routing RS-232/RS-422/RS-485 signals to multiple endpoints.
- Embedded Systems: Providing multi-channel connectivity for development boards or control units.

Compatibility:
- Compatible with standard D-sub connectors and interface cards.
- Works with devices supporting DB37 and DB25 pin configurations.
- Suitable for both PC-based and standalone equipment.

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5. Components & Accessories
Included Items:
- 1 × Rayon A400 cable (DB37 male to 4 × DB25 male, 0.2 m length)

Optional Accessories (not included):
- DB25 female-to-female adapters or gender changers
- DB37 female extension cables
- Mounting brackets or cable management clips
- Protective connector caps for unused ports

Connectors:
- DB37 Male Connector: 37-pin D-sub male with metal shell and locking screws for secure attachment.
- DB25 Male Connectors (×4): 25-pin D-sub male connectors with molded strain relief and thumbscrews for secure mating.

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6. Installation & Setup
Requirements:
- Compatible devices with DB37 and DB25 female ports.
- Adequate space for connector clearance (D-sub connectors typically require ~30 mm clearance).
- Ensure proper grounding and shielding continuity for noise-sensitive applications.

Mounting Options:
- Direct plug-in connection to panel-mounted or card-mounted D-sub ports.
- Can be routed through cable trays or harnesses within equipment enclosures.

Configuration:
- Plug the DB37 male connector into the host device or controller.
- Connect each DB25 male connector to the corresponding peripheral or subsystem.
- Verify pin assignments if custom wiring is required; consult device documentation for signal mapping.
- Secure connectors using the integrated thumbscrews to prevent accidental disconnection.

Best Practices:
- Avoid excessive bending or twisting of the cable to maintain signal integrity.
- Keep cable runs short and separated from high-voltage lines to minimize interference.
- Label each DB25 connector for easy identification during maintenance or troubleshooting.

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7. Performance & Capabilities
Signal Transmission:
- Supports low-voltage digital and analog signals typical of D-sub applications.
- Maintains signal integrity over short distances (0.2 m) with minimal attenuation.

Speed and Bandwidth:
- Suitable for standard serial communication speeds (up to 1 Mbps for RS-232, higher for RS-422/485).
- Capable of supporting parallel data transfer for control or measurement systems.

Capacity:
- One DB37 interface can distribute up to 37 signal lines across four DB25 connectors, depending on wiring configuration.
- Each DB25 connector provides 25 signal lines, allowing flexible signal routing or channel grouping.

Efficiency:
- Short cable length reduces resistance and capacitance, improving transmission efficiency.
- Shielded construction minimizes electromagnetic interference (EMI).

Limitations:
- Not intended for high-power transmission; designed for signal-level applications only.
- Limited to short-distance connections due to 0.2 m length.
- Custom pin mapping may be required for specific applications.

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8. Standards & Compliance
Connector Standards:
- Complies with D-subminiature connector standards (IEC 60807-3 / MIL-DTL-24308).
- Pin and shell dimensions conform to industry-standard specifications for DB37 and DB25 connectors.

Electrical Compliance:
- Meets typical low-voltage signal cable requirements (≤30 V DC).
- Compatible with RS-232, RS-422, and RS-485 communication standards (depending on wiring).

Environmental & Safety Standards:
- RoHS compliant (Restriction of Hazardous Substances).
- REACH compliant (Registration, Evaluation, Authorization, and Restriction of Chemicals).
- Manufactured in accordance with ISO 9001 quality management standards.

Industry Standards:
- Suitable for use in industrial automation, instrumentation, and computing environments adhering to standard D-sub interface protocols.

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9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 12–24 months, depending on region and distributor).
- Covers defects in materials and workmanship under normal use conditions.

Support:
- Technical documentation and pinout diagrams available from Rayon or authorized distributors.
- Customer support provided via email or online service portal.

Maintenance:
- Periodic inspection recommended to ensure connector integrity and cleanliness.
- Clean contacts with appropriate electronic contact cleaner if oxidation occurs.
- Store in a dry, dust-free environment when not in use.

Updates & Customization:
- Custom cable lengths, connector genders, and pin configurations available upon request.
- Rayon offers OEM and ODM customization for specialized applications.

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Summary
The Rayon A400 Cable (DB37m to 4×DB25m, 0.2 m) is a compact, high-quality interconnect solution designed for multi-channel signal distribution in industrial, laboratory, and communication systems. Its robust construction, precision-molded connectors, and short length make it ideal for environments where reliability, space efficiency, and signal integrity are critical. Fully compliant with D-sub connector standards and RoHS/REACH directives, the A400 provides a dependable interface for connecting controllers, instruments, and peripheral devices in a wide range of professional applications.