Adafruit
Adafruit RS232 Full Breakout with DE9-M
· MPN: ADA6253
The Adafruit RS-232 Full Breakout with DE9-M lets you interface any 3.3 V microcontroller or single-board computer with RS-232 devices using all 8 data/flow-...
The Adafruit RS-232 Full Breakout with DE9-M lets you interface any 3.3 V microcontroller or single-board computer with RS-232 devices using all 8 data/flow-control signals. Built around the trusted TI MAX3243, it generates the required positive and negative voltages internally and provides 5 input and 3 output channels of level shifting at up to 250 Kbps.
This version features a DE9-M (male pin) connector — check the product photos to confirm it matches the device or cable you want to connect to.
Key Features
- MAX3243 Level Shifter – 8 channels (5 input, 3 output) for full RS-232 pinout including RTS, CTS, DTR, DSR, DCD, and RI
- DE9-M Male Connector – 9-pin D-Sub male connector for direct plug-in to RS-232 devices or cables
- 3.3 V Power & Logic – Runs on 3.3 V, compatible with modern microcontrollers
- Up to 250 Kbps – Suitable for most RS-232 communication needs
- Valid Signal Output – Logic-level output goes high when RS-232 signal voltages are detected (connection indicator)
- Off/Tri-State Pin – Set high to tri-state all pins for power reduction
- Fully Assembled – UART side for low-voltage logic, DE9-M side for RS-232; headers included for breadboard use
Also Consider
- RS-232 Full Pinout Level-Shifter Breakout (DE9-F) – Same board with a female DE-9 connector
Ideal For
- Interfacing with industrial and telco equipment
- Retro computing and legacy device communication
- Barcode scanners, modems, and serial terminals
- Any project requiring full RS-232 flow control signals
Package Contents
- 1× Adafruit RS-232 Full Breakout with DE9-M (fully assembled)
- 1× Header strip (soldering required for breadboard use)
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- CTS
- CTS stands for Clear To Send, a serial flow-control signal that tells the other device it may transmit. It matters for reliable high-speed serial communication where buffers could otherwise overflow.
- Headers
- Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- RS-232
- An older serial communication standard that uses higher signal voltages than modern microcontroller logic pins. If you are connecting this breakout to a microcontroller, you may need an RS-232 interface or level converter rather than wiring it directly.
- RTS
- RTS stands for Request To Send, a serial flow-control signal used to manage when a device is ready to receive data. It matters when moving fast serial streams because flow control can help prevent lost data.
- single-board computer
- A complete computer built onto one circuit board, usually including the processor, memory, ports, and connectors. This matters because accessories like heatsinks must match the board’s layout and mounting holes to fit properly.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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