ET-C05
RS-232 Transceiver
Real RS-232 levels from 3.3 V or 5 V logic
AED 29.00
Out of stockOverview
Real RS-232 levels from 3.3 V or 5 V logic
The ET-C05 is built around the MAX3232 — 2 drivers + 2 receivers, ±5.4V output swing from 3.3V, up to 250kbps, ±8kV ESD.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- PLCs and lab instruments
- Legacy serial consoles
- Industrial equipment ports
Key features
What makes it different
Transceiver
MAX3232: 2 drivers + 2 receivers, ±5.4V output swing from 3.3V, up to 250kbps, ±8kV ESD
Logic
3.3V or 5V (follows VCC)
Port
Screw terminal TXD / RXD / GND for channel 1; channel 2 on a header (RTS/CTS or a 2nd port)
Use
PLCs, lab instruments, GPS/console ports with real RS-232 levels
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Transceiver | MAX3232: 2 drivers + 2 receivers, ±5.4V output swing from 3.3V, up to 250kbps, ±8kV ESD |
|---|---|
| Logic | 3.3V or 5V (follows VCC) |
| Port | Screw terminal TXD / RXD / GND for channel 1; channel 2 on a header (RTS/CTS or a 2nd port) |
| Use | PLCs, lab instruments, GPS/console ports with real RS-232 levels |
| Size | 25.4 × 17.8 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 6-pin 2.54 mm header |
| Main IC | MAX3232ESE(UMW) (LCSC C2904738) |
| Revision | Rev A |
Performance
Signal levels
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | Power | 3.0–5.5V |
| 2 | GND | Ground | Ground |
| 3 | TX | UART | Logic TX → RS-232 TXD |
| 4 | RX | UART | RS-232 RXD → logic RX |
| 5 | T2IN | Signal | 2nd channel |
| 6 | R2OUT | Signal | 2nd channel |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-C05 RS-232 Transceiver (assembled)
- 1 × 6-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VCC, GND, TX, RX, T2IN, R2OUT
Compare
Which serial adapter?
| RS-232 Transceiver (this board)This board | ET-C03 USB-C to UART Adapter | ET-C04 ESP32 / ESP8266 Programmer | |
|---|---|---|---|
| What it does | Real RS-232 levels from 3.3 V or 5 V logic | CH340C serial adapter with 3.3 V logic | USB-C programmer with automatic reset and boot |
| Interface | — | — | — |
| Best for | PLCs and lab instruments | Debug consoles | Flashing bare ESP32 modules |
| Price | 29 AED | 27 AED | 19 AED |
Downloads
Documents and design files
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Different connector, size or sensor? We design and build custom variants.