ET-C10
USB-C to RS-485 Adapter
Modbus RTU from your PC over USB-C
AED 28.00
Out of stockOverview
Modbus RTU from your PC over USB-C
The ET-C10 is built around the CH340C USB-UART → SP3485 RS-485 half duplex, up to 2Mbps.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Modbus RTU from a laptop
- Configuring meters and VFDs
- Testing RS-485 networks
Key features
What makes it different
Bridge
CH340C USB-UART → SP3485 RS-485 half duplex, up to 2Mbps
Direction
RTS controls DE/RE — enable RS-485 mode in software (pyserial rs485, pymodbus, QModMaster, Modbus Poll 'RTS toggle')
Bus
Screw terminal A / B / GND, optional 120Ω termination
Use
Modbus RTU from a PC, energy meters, VFDs, PLCs
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
| Bridge | CH340C USB-UART → SP3485 RS-485 half duplex, up to 2Mbps |
|---|---|
| Direction | RTS controls DE/RE — enable RS-485 mode in software (pyserial rs485, pymodbus, QModMaster, Modbus Poll 'RTS toggle') |
| Bus | Screw terminal A / B / GND, optional 120Ω termination |
| Use | Modbus RTU from a PC, energy meters, VFDs, PLCs |
| Size | 38.1 × 17.8 mm |
|---|---|
| Mounting | 2 mounting holes (M2.5), one at each end |
| Connectors | 0-pin 2.54 mm header · USB-C 16P receptacle (USB 2.0) — USB-C |
| Main IC | CH340C (LCSC C84681) |
| Revision | Rev A |
| JP1 (default Open) | Bridge to add 120Ω termination |
|---|
Performance
Cable length
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-C10 USB-C to RS-485 Adapter (assembled)
Getting started
- Wire the header:
Compare
Which industrial bus board?
| USB-C to RS-485 Adapter (this board)This board | ET-C01 RS-485 Transceiver | ET-C02 CAN Bus Transceiver | ET-C09 MCP2515 SPI CAN Board | |
|---|---|---|---|---|
| What it does | Modbus RTU from your PC over USB-C | Half-duplex RS-485 for Modbus and long UART runs, 3.3 V | 3.3 V CAN transceiver for MCUs with built-in CAN | CAN controller + 3.3 V transceiver over SPI |
| Interface | — | UART RX/TX + DE/RE direction pins, 3.3V logic | — | — |
| Best for | Modbus RTU from a laptop | Modbus RTU sensors and meters | ESP32 TWAI and STM32 CAN projects | CAN on Raspberry Pi and Arduino |
| Price | 28 AED | 9 AED | 12 AED | 9 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.