The SerialComm TTL-232-33P is a compact bi-directional RS-232 to 3.3V TTL serial converter designed to interface standard RS-232 serial devices with 3.3V TTL-level UART equipment such as embedded systems, microcontrollers, GPS receivers, and development boards. It is port-powered, requiring no external power supply in most applications.
Key Specifications
| Feature | Specification |
|---|---|
| Interface | RS-232 ↔ 3.3V TTL (UART) |
| Direction | Full duplex, bi-directional |
| TTL Logic Level | 3.3V |
| Baud Rate | 300 to 115,200 bps |
| Power | Port-powered from RS-232 data lines |
| Connectors | DB9 Female (RS-232), DB9 Male or included 5-position terminal block (TTL) |
| Protection | 15 kV ESD, 600 W surge protection |
| Operating Temperature | -20°C to +60°C (-4°F to 140°F) |
| Housing | Rugged ABS (IP40) |
TTL Terminal Pinout
| Pin | Signal |
|---|---|
| 1 | NC |
| 2 | TTL IN (RX) |
| 3 | TTL OUT (TX) |
| 4 | NC |
| 5 | GND |
Typical Applications
- Embedded systems and microcontrollers
- PLCs and industrial controllers
- Single-board computers
- GPS receivers
- Data acquisition systems
- Legacy RS-232 equipment requiring a 3.3V UART interface



