1. Product Overview
Product Name: Cable DB37m to 4×DB9m
Model: A404
Series: A400 Series Connectivity Cables
Article Number: A404
Manufacturer: Rayon

The Rayon A404 is a high-quality multi-port data communication cable designed to interface a single DB37 male connector with four DB9 male connectors. This specialized breakout cable provides a compact and reliable solution for connecting multi-channel serial communication devices, industrial controllers, or legacy equipment that require multiple RS-232 or similar serial interfaces from a single DB37 port. With a total cable length of 0.2 meters, the A404 is optimized for short-distance internal or panel-level interconnections where signal integrity, minimal clutter, and robust mechanical performance are critical.

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2. Key Features
- Multi-Port Breakout Design: Converts one DB37 male connector into four DB9 male connectors, enabling simultaneous connection of up to four serial devices.
- Compact 0.2 m Length: Short cable length minimizes signal loss and electromagnetic interference (EMI), ideal for internal rack or enclosure wiring.
- High-Quality Construction: Manufactured by Rayon with precision-molded connectors and durable cable sheathing for long-term reliability.
- Universal Compatibility: Supports standard RS-232, RS-422, or custom serial pinouts depending on system configuration.
- Secure Mechanical Fit: Each connector features screw-lock mechanisms to ensure stable and vibration-resistant connections.
- Optimized Signal Integrity: Shielded cable design reduces crosstalk and maintains consistent data transmission quality.
- Industrial-Grade Materials: Designed for use in industrial automation, instrumentation, and communication systems.
- Plug-and-Play Operation: No additional drivers or configuration required; purely passive electrical interconnection.
- Versatile Application Range: Suitable for data acquisition systems, CNC controllers, PLCs, test benches, and legacy serial communication setups.

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3. Technical Specifications
- Product Type: Multi-port serial breakout cable
- Model / Article Number: A404
- Manufacturer: Rayon
- Connector 1: DB37 male (37-pin D-sub, standard density)
- Connector 2: 4 × DB9 male (9-pin D-sub, standard density)
- Cable Length: 0.2 meters (20 centimeters)
- Cable Type: Shielded multi-core cable
- Conductor Material: Tinned copper conductors for optimal conductivity and corrosion resistance
- Insulation Material: PVC or equivalent industrial-grade insulation
- Outer Jacket: Flexible PVC sheath, abrasion-resistant, color-coded (typically gray or black)
- Pin Configuration: One-to-many breakout mapping from DB37 to four DB9 connectors (specific pinout dependent on application)
- Operating Voltage: Typically up to 30 V DC (signal level)
- Signal Type: Serial communication (RS-232/RS-422 compatible)
- Operating Temperature Range: -20 °C to +75 °C (typical for industrial-grade cables)
- Storage Temperature Range: -40 °C to +85 °C
- Cable Diameter: Approx. 6–8 mm (main trunk), 4–5 mm (branch leads)
- Weight: Approx. 100–150 g (depending on connector housing)
- Shielding: Aluminum foil and/or braided copper shield for EMI protection
- Connector Housing Material: Nickel-plated steel or molded plastic with strain relief
- Contact Plating: Gold or tin over nickel for enhanced conductivity and corrosion resistance
- Mechanical Durability: >500 mating cycles per connector

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4. Functionality
The Rayon A404 functions as a passive breakout cable that distributes signals from a single DB37 male connector to four separate DB9 male connectors. Each DB9 interface can be assigned to a specific communication channel, allowing multiple serial devices to be connected to a single host interface or controller.

Typical Use Cases:
- Connecting multiple RS-232 serial devices (e.g., sensors, modems, controllers) to a single multi-port serial card or interface.
- Industrial automation systems where a central controller communicates with multiple subsystems via serial links.
- Laboratory instrumentation setups requiring multiple data acquisition channels.
- Legacy computer systems or test equipment that use DB37 connectors for multi-channel serial communication.
- Custom embedded systems or control panels where compact, short-distance cabling is required.

Compatibility:
- Compatible with standard D-sub connectors conforming to EIA/TIA-232 and EIA/TIA-422 standards.
- Works with PCs, industrial controllers, communication hubs, and serial expansion cards featuring DB37 interfaces.
- Can be used with adapters or gender changers if required for specific configurations.

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5. Components & Accessories
Included Components:
- 1 × Rayon A404 cable assembly (DB37 male to 4 × DB9 male, 0.2 m length)

Optional Accessories (not included):
- DB9 female-to-female couplers or gender changers
- DB37 female extension cables
- Panel-mount DB9 connectors or breakout boxes
- Cable management clips or strain relief mounts

Connectors:
- DB37 male connector with two securing screws (4-40 UNC thread)
- Four DB9 male connectors, each with screw-locks for secure attachment
- Molded strain relief at each connector junction to prevent cable fatigue

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6. Installation & Setup
Requirements:
- Compatible DB37 female port on host device or interface card
- Four DB9 female ports on peripheral devices or adapters

Installation Steps:
1. Power off all connected equipment before installation.
2. Connect the DB37 male connector of the A404 cable to the corresponding DB37 female port on the host device.
3. Secure the connection using the built-in screw locks to prevent accidental disconnection.
4. Connect each DB9 male connector to the corresponding DB9 female port on the target devices.
5. Tighten the DB9 connector screws to ensure a stable mechanical connection.
6. Power on the system and verify communication between the host and connected devices.

Mounting Options:
- Suitable for internal cabinet routing or short external connections.
- Can be secured using cable ties or clips to maintain organized wiring.

Configuration:
- The cable is passive and requires no software configuration.
- Pin assignments should match the host device’s DB37-to-DB9 mapping; consult the device’s documentation for correct wiring.

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7. Performance & Capabilities
Data Transmission:
- Supports standard serial communication speeds up to 115.2 kbps (RS-232) or higher depending on system configuration and cable quality.
- Low signal attenuation due to short 0.2 m length ensures reliable data integrity.

Electrical Performance:
- Impedance: 100–120 Ω (typical for shielded twisted-pair signal lines)
- Capacitance: <50 pF/m between conductors (typical)
- Crosstalk: <30 dB at 1 MHz (typical)

Mechanical Performance:
- Bend radius: Minimum 5× cable diameter
- Tensile strength: >50 N (main cable)
- Flex life: >1,000,000 cycles under normal operating conditions

Efficiency & Limitations:
- Designed for short-distance signal distribution; not suitable for long cable runs or high-speed differential signaling beyond RS-232/422 limits.
- Passive design means no signal amplification or isolation; external repeaters or isolators may be required for extended distances.

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8. Standards & Compliance
Connector Standards:
- DB37 and DB9 connectors conform to IEC 60807-3 / DIN 41652 / EIA/TIA D-subminiature standards.

Electrical Standards:
- Compatible with EIA/TIA-232-F (RS-232) and EIA/TIA-422-B (RS-422) signaling specifications.

Environmental & Safety Compliance:
- RoHS (Restriction of Hazardous Substances) compliant – free from lead, mercury, cadmium, and other restricted materials.
- REACH compliant – meets European Union chemical safety regulations.
- CE marking (if applicable) for conformity with EU directives.
- Manufactured under ISO 9001:2015 quality management standards.

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

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9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 12 months) covering defects in materials and workmanship under normal use conditions.

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

Maintenance:
- No active maintenance required; periodic inspection recommended to ensure connector integrity and cable condition.
- Clean connectors with dry, lint-free cloth; avoid exposure to moisture or corrosive environments.

Updates & Replacements:
- The A404 may be part of a broader product line with varying lengths or connector configurations (e.g., DB37 to 4×DB9f, or longer cable variants).
- Replacement cables and compatible accessories are available through Rayon’s authorized resellers.

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Summary
The Rayon A404 Cable (DB37m to 4×DB9m, 0.2 m) is a compact, high-quality breakout cable engineered for reliable multi-channel serial communication. Its robust construction, shielded design, and precision-molded connectors make it ideal for industrial, laboratory, and computing environments where dependable short-distance connectivity is essential. With compliance to international connector and environmental standards, the A404 ensures consistent performance, mechanical durability, and long service life in demanding applications.