USB to RS485/RS232 Converter Module | CH343G Half-Duplex
USB to RS485/RS232 Converter Module | CH343G Half-Duplex
diymore USB to RS485/RS232 Bidirectional Communication Converter Module
Upgrade your serial communication setup with the diymore Industrial-Grade USB to RS485/RS232 Converter Module. Powered by the advanced CH343G chip, this plug-and-play module lets you switch seamlessly between RS485 and RS232 protocols via a simple DIP switch — no soldering, no complicated configuration. Whether you're working on industrial automation, embedded systems, or DIY electronics, this compact module delivers reliable, high-speed data communication up to 1,000,000 bps. Made in Mainland China.
Key Features
- Dual Protocol Support: Switchable between RS485 and RS232 via on-board DIP switch for versatile deployment.
- CH343G Chip: Latest-generation chipset ensures true plug-and-play compatibility with Windows, macOS, and Linux — no driver hassle.
- Wide Communication Rate: Supports 50 bps to 1,000,000 bps to match any application's throughput needs.
- Built-In Surge & ESD Protection: On-board TVS (Transient Voltage Suppressor) provides 600W lightning protection, surge protection, and up to 15KV electrostatic protection.
- Self-Resetting Fuse & Protection Diode: 200mA resettable fuse and ESD protection diode safeguard both your module and connected devices from overcurrent/overvoltage events.
- 3 LED Status Indicators: Dedicated PWR, TXD, and RXD LEDs give you instant visual feedback on power status and data transmission activity.
- Extended RS485 Range: Transmit up to approximately 1,200 metres (RS485) or 10 metres (RS232) at low data rates.
- Multi-Node Support: Point-to-multipoint RS485 topology supports up to 32 nodes (repeater recommended for 16+ nodes).
- 120Ω Balancing Resistor: On-board termination resistor reduces signal reflections for clean, stable RS485 communication.
- USB Type-A Connector: Standard, universally compatible host interface operating at 5V.
Technical Specifications
| Brand | diymore |
| Chip | CH343G |
| Host Interface | USB Type-A connector |
| Device Interface | RS485 / RS232 (DIP switch selectable) |
| Operating Voltage | 5V (USB bus-powered) |
| Communication Rate | 50 bps – 1,000,000 bps |
| RS485 Transmission Distance | ~1,200 m (at low data rates) |
| RS232 Transmission Distance | ~10 m (at low data rates) |
| USB Interface Protection | 200mA resettable fuse, ESD protection |
| RS485/RS232 Protection | 600W lightning, surge, 15KV ESD, 120Ω balancing resistor |
| Interface Pins | GND, A+ (TXD), B− (RXD) |
| Direction Control | Hardware automatic detection & control |
| Transmission Mode | Half-duplex (RS485 multi-drop up to 32 nodes; RS232 point-to-point) |
| OS Compatibility | Windows, macOS, Linux |
| Package | TQFP |
| Country of Origin | Made in Mainland China |
LED Indicator Guide
- PWR: Illuminates when USB connection detects voltage — confirms the module is powered.
- TXD: Flashes when data is being transmitted from the USB port.
- RXD: Flashes when data is being received via the USB port.
Interface Pin Connections
- GND: Peripheral connection ground
- A+ / TXD: RS485 Line A — or RS232 RXD
- B− / RXD: RS485 Line B — or RS232 TXD
What's in the Box
- USB to RS485/RS232 Converter Module × 1
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Frequently Asked Questions
Q: Does the USB to RS485/RS232 converter module require a driver installation?
A: No. The module uses the CH343G chip, which supports true plug-and-play functionality. It is compatible with Windows, macOS, and Linux operating systems and is recognized automatically without the need for manual driver installation in most cases.
Q: Can I switch between RS485 and RS232 modes without any tools?
A: Yes. The module features an on-board DIP switch that allows you to toggle between RS485 and RS232 modes quickly and easily — no soldering or additional hardware required.
Q: How far can this module transmit data?
A: In RS485 mode, the module supports transmission distances of up to approximately 1,200 metres at low data rates. In RS232 mode, the effective range is approximately 10 metres. For RS485 networks with more than 16 nodes, using a repeater is recommended for optimal signal integrity.
Q: What protection features does this converter module include?
A: The module is equipped with an on-board TVS (Transient Voltage Suppressor) for 600W lightning protection and up to 15KV electrostatic protection, a 200mA self-resetting fuse, a protection diode, and an on-board 120Ω balancing resistor for stable RS485 signal quality.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.