DB9 Male to Screw Terminal Adapter – 9-Pin RS232/RS485 Converter Board

SKU: FA2045-4
Connector Type

DB9 Male (D-Sub 9-Pin)
Terminal Type

Professional 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
Operating Temp

-20°C to +85°C
Dimensions

~45mm x 31mm x 18mm
Product Description
The DB9 Male to Screw Terminal Adapter is a rugged, industrial-grade solution designed to simplify serial connectivity in the field. This breakout board eliminates the need for tedious soldering or specialized crimping tools, allowing you to connect bare wires directly to a standard DB9 interface using only a small screwdriver.
Engineered for reliability, the board breaks out all 9 pins of the DB9 connector plus the shield (GND), providing a clear, labeled path for RS232, RS422, or RS485 communication. Whether you are performing on-site maintenance on a PLC, wiring a custom serial sensor to a controller, or prototyping a new communication interface, this adapter ensures a secure, vibration-resistant connection. Its compact design and integrated strain relief make it the definitive choice for engineers and technicians requiring a fast, “plug-and-play” serial wiring solution.
Key Features
  • Solderless “Quick-Connect” Design: Features high-quality screw terminals for fast, secure wiring without the need for soldering irons or heat shrink.
  • Full 9-Pin Breakout + Shield: Provides access to all pins (1-9) plus a dedicated terminal for the cable shield/case ground to ensure signal integrity.
  • Clear Silk-Screen Labeling: Each terminal is clearly numbered and labeled, significantly reducing wiring errors during installation and troubleshooting.
  • Industrial Build Quality: Constructed with a high-durability DB9 male head and a FR-4 fiberboard PCB for long-term stability in harsh environments.
  • Vibration Resistant: Screw terminals provide a high-torque grip on wires, making it ideal for use in machinery or vehicles subject to movement.
  • Slim Profile: Engineered to fit into tight spaces, allowing for side-by-side mounting on multi-port serial cards.
Usage & Applications
  • Industrial Automation: Wiring PLCs, CNC machines, and motor drivers that utilize RS232 or RS485 communication protocols.
  • Field Diagnostics: A must-have tool for technicians needing to tap into serial lines for data logging or equipment configuration.
  • Custom Cable Assembly: Create bespoke serial cables of any length without the complexity of soldering D-sub connectors.
  • 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.
Q: Can this be used for both RS232 and RS485?

Yes. Since it 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 special tools to install the wires?

No. A standard small flat-head or Phillips-head screwdriver is all you need to secure the wires into the terminals

Q: What size wire can I use with this adapter?

The terminals are designed to accept a wide range of wire sizes, typically from 26 AWG (thin signal wire) up to 16 AWG (thicker power or industrial wire).

Q: Is there a terminal for the "Shield" or Ground?

Yes. In addition to pins 1 through 9, there is an extra terminal (often labeled “G” or “S”) connected to the metal housing of the DB9 connector to ensure proper grounding and noise reduction.

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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