DB9 Female adapter screw terminal 9-pin 9-hole RS232 or RS485 conversion board

SKU: FA2045-5
Connector Type

DB9 Female (9-Hole D-Sub)
Terminal Type

Professional-Grade Screw Terminals
Wire Gauge Range

26 AWG to 16 AWG
Voltage Rating

300V AC/DC
Current Rating

2A (Per Pin)
Terminal Pitch

3.81mm or 5.0mm (Model Dependent)
Operating Temp

-20°C to +85°C (Industrial Grade)
Dimensions

~45mm x 31mm x 18mm
Product Description
The DB9 Female to Screw Terminal Adapter is a rugged, industrial-grade solution designed to simplify serial connectivity and field wiring. This breakout board eliminates the need for tedious soldering or specialized crimping tools, allowing technicians to connect bare wires directly to a standard 9-hole DB9 interface using only a small screwdriver.
Engineered for maximum versatility, the board breaks out all 9 pins plus the shield (GND), providing a clear, labeled path for RS232, RS422, or RS485 communication. Its compact, low-profile design is perfect for space-constrained enclosures, while the high-quality screw terminals ensure a vibration-resistant connection in demanding environments. Whether you are performing on-site maintenance on a PLC, wiring a custom sensor to an industrial controller, or prototyping a new communication bridge, this adapter provides a secure, “plug-and-play” serial wiring solution.
Key Features
  • Tool-Free Solderless Termination: High-quality screw terminals allow for fast, secure wiring without a soldering iron or heat shrink.
  • Full 9-Pin + Shield Breakout: Provides access to all 9 pins (1-9) plus a dedicated terminal for the cable shield/case ground to ensure signal integrity and noise reduction.
  • Precision Labeled PCB: Each terminal is clearly numbered and silk-screened to match standard DB9 pinouts, significantly reducing wiring errors during installation.
  • Industrial Build Quality: Constructed with a high-durability DB9 female socket and a FR-4 fiberboard PCB for long-term stability in harsh conditions.
  • Vibration Resistant: Screw terminals provide a high-torque grip on wires, making it ideal for use in machinery, transit, or robotics subject to constant movement.
  • Universal Protocol Support: Physically compatible with any protocol using a DB9 interface, including RS232, RS485, RS422, and CAN Bus.
Usage & Applications
  • Industrial Automation: Wiring PLCs, HMI panels, and motor drivers that utilize RS232 or RS485 communication protocols.
  • Field Diagnostics: An essential tool for field engineers needing to tap into serial lines for data logging or equipment configuration.
  • Building Management: Connecting HVAC controllers, security panels, and lighting systems to central monitoring hubs.
  • Scientific Research: Interfacing laboratory instruments with custom DAQ (Data Acquisition) systems.
  • Custom Cable Repair: Quickly replace damaged serial connectors in the field without returning to the workshop
Q: Can this be used for RS485 communication?

Yes. This is a physical breakout board. It simply routes the 9 pins of the DB9 connector to the terminals. It works with any protocol that uses a DB9 physical interface, including RS232, RS422, RS485, and CAN bus

Q: Do I need a special screwdriver to install the wires?

No. A standard small flat-head or Phillips-head screwdriver (often referred to as a “precision” or “jeweler’s” screwdriver) is all you need.

Q: What is the benefit of the "G" or "S" terminal?

This terminal is connected to the metal shell of the DB9 connector. Connecting your cable’s drain wire or shield to this terminal helps protect against electromagnetic interference (EMI) and ensures a stable ground

Q: Is the DB9 connector a "Male" or "Female" type?

This specific model is a Female (9-hole) connector, typically used to connect to the Male serial ports found on the back of PCs or industrial controller hardware

Q: Can I use this for permanent outdoor installations?

While the board is built for industrial use, it is an open-frame design. For outdoor use, it should be housed inside an IP-rated weatherproof enclosure to protect the terminals from moisture and corrosion

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