Serial Port Mini RS232 to TTL Converter Adapter Module Board MAX3232 – 5V UART Level Converter
The Serial Port Mini RS232 to TTL Converter Adapter Module is a bi-directional electrical level converter designed to interface RS232 serial devices with 5V TTL-level UART systems. It converts signals from RS232 voltage levels to TTL levels and from TTL levels back to RS232. The module is suitable for connecting PCs and laptops with microcontroller UART interfaces and can be used in embedded electronics, robotics, experimental and educational projects. It uses a MAX232CSE transceiver and supports communication speeds of up to 120kbps. The compact 50 × 40mm PCB includes low-current status LEDs and is designed for very low power consumption.
The module supports a 3.0–5.5V VCC input and provides dedicated TTL and RS232 signal connections. An optional onboard PSU is also specified for quick-start internal or external use.
Key Features
- RS232 to TTL bidirectional signal conversion.
- TTL to RS232 bidirectional signal conversion.
- MAX232CSE-based design.
- Communication speed up to 120kbps.
- Supports PC and laptop RS232 interfaces.
- Supports microcontroller UARTs.
- 5V TTL signal-level support.
- 3.0–5.5V VCC supply.
- Compact 50 × 40mm PCB footprint.
- Low-current status LEDs.
- Very low power consumption.
- Optional onboard PSU.
- Power can be routed to RS232 connector pin 9 when required.
- Suitable for electronics, robotics and educational projects.
Technical Specifications
| Specification |
Details |
| Product Type |
RS232 to TTL Converter Module |
| Chip |
MAX232CSE |
| Protocol |
RS232 |
| Operating Voltage |
3–5V |
| VCC Input |
3.0–5.5V |
| Maximum Baud Rate |
Up to 120kbps |
| Transceiver |
2 |
| Conversion |
1 TTL → RS232 + 1 RS232 → TTL |
| Receiver Hysteresis |
300mV |
| PCB Size |
50 × 40mm |
| Status Indicator |
Low-current LED(s) |
| Operating Temperature |
-40 to 80°C |
| Interface |
RS232 / TTL UART |
| Power Consumption |
Very Low |
| Direction |
Bi-directional |
Pin-Out
| Pin |
Function |
| 1 |
– (0V) |
| 2 |
+ (VCC 3.0–5.5V) |
| 3 |
TTL-TXD |
| 4 |
TTL-RXD |
| 5 |
– (0V) |
| 6 |
+ (VCC 3.0–5.5V) |
| 7 |
RS232-RX |
| 8 |
RS232-TX |
Applications
- PC to microcontroller interfacing.
- Laptop to UART interfacing.
- RS232 communication projects.
- Microcontroller UART projects.
- Arduino and embedded projects.
- Robotics projects.
- Serial communication systems.
- Electronics experimentation.
- Educational electronics projects.
- DIY communication interfaces.
Precautions
- Check the supply voltage before connecting the module.
- Ensure correct polarity when connecting VCC and GND.
- Connect TTL-TXD to the corresponding TTL-RXD input of the target device.
- Connect RS232-RX and RS232-TX according to the connected equipment.
- Do not connect RS232 voltage directly to a TTL-only input without proper level conversion.
- Verify the voltage level requirements of the connected microcontroller.
- Do not exceed the specified maximum baud rate of 120kbps.
- Power off the connected equipment before changing wiring.
- Avoid short circuits between signal and power pins.
