The USB to RS485/RS232/RS422 Communication Module, equipped with the CH340 Chip, serves as a versatile and reliable instrument designed to convert USB signals into three distinct serial communication standards: RS485, RS232, and RS422. This module is extensively utilized in industrial automation, data acquisition, and communication systems, offering adaptable solutions for integrating modern USB-enabled devices with legacy serial systems.
USB to RS485/232/422(CH340 chip) communication module
New
📦 Location of the warehouse: China
Free Shipping from $50 in the US, $70 for non-continental US
- US Delivery Time: 2~7 Business days.
- Non-Continental US Delivery Time: 3~9 working days.
- Pre-Ordering: If an item is unavailable, you can pre-order it. We'll dispatch once stock is replenished, usually within 10 working days. Special pre-sale products will specify the expected arrival time in the description.
- Express Shipping: Need it faster? Contact us via email or through our live chat support, and we'll arrange expedited delivery for you.
USB to RS485/232/422(CH340 chip) communication module
Key Features:
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Multi-Protocol Support (RS485/RS232/RS422):
This communication module supports RS485, RS232, and RS422 protocols, offering a broad range of compatibility with various industrial devices. You can easily switch between the communication standards depending on your specific needs, making it ideal for different applications and environments.
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CH340 Chip for Stable Performance:
The module is powered by the reliable CH340 chip, known for its excellent compatibility and performance with USB ports. It ensures stable data transmission, high-speed communication, and ease of integration with a wide range of devices, including PCs, embedded systems, and microcontrollers.
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Two-Way TVS Protection:
The two-way Transient Voltage Suppression (TVS) protection ensures that the module is shielded from voltage spikes, preventing damage from electrical surges and noise. This feature enhances the durability of the module, especially in industrial and high-noise environments.
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Versatile Application Range:
Ideal for use in industrial automation, data acquisition, communication systems, embedded systems, and PLC control, this module can connect to a wide array of devices that use serial communication standards. It is perfect for controlling machinery, gathering data from sensors, and integrating various RS485/RS232/RS422-based devices into modern systems.
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Plug-and-Play Design:
The module is designed for easy installation with plug-and-play functionality. It is compatible with Windows, Linux, and macOS, and requires no additional drivers in many cases, simplifying the setup process and minimizing the time needed for deployment.
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Durable and Industrial-Grade Construction:
With robust protection against voltage spikes and high-temperature fluctuations, this module is built to endure demanding industrial conditions, ensuring long-lasting and reliable performance in harsh environments.
Technical Specifications
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Chipset: CH340
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Communication Standards Supported: RS485, RS232, RS422
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TVS Protection: Two-way protection against voltage surges and spikes
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Operating Voltage: 5V (via USB)
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Data Transfer Rate: Up to 1 Mbps
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Connector Types: DB9, terminal block, or screw terminal (depending on model)
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Operating Temperature Range: -40°C to 85°C
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Dimensions: Compact and portable for easy integration into existing systems
Multiple Protections
TVS Transient Suppression Protection: Equipped with TVS transient suppression protection to prevent damage to internal chips caused by incompatible voltage levels.
Instant Overvoltage Protection: Provides protection against transient interferences such as lightning, electrostatic discharge, surge impact, and overvoltage caused by power system switching. Protective circuits are used to divert harmful transient energy to the ground, effectively shielding the device from potential damage due to these disturbances.
Intelligent Core for Stable Transmission
Utilizes the CH340 driver for reliable performance.
Supports USB to RS485 half-duplex communication and RS232 full-duplex communication for versatile data transmission needs.
Wiring Instructions
Connects directly to your computer's USB port.
USB to RS485
| No. | USB-A | Port Information | 485 Signal |
|---|---|---|---|
| 1 | A | 485+ | 485+ |
| 2 | B | 485- | 485- |
| 3 | GND | GND | GND |
| 4 | GND | GND | GND |
| 5 | +5V | +5V | +5V |
USB to RS485/232
USB to RS485/422
Product Size
| Model | Shell Material | Interface | Warranty |
|---|---|---|---|
| TFU485D | PVC Shell | Nickel-Plated Interface | One Year |
Applicable Products (For Reference):
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POS Machines
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Barcode Printers
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Access Control Systems
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PLCs
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Scanners
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External Modems
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CNC Machines
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PLAM
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Tax Control Machines
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LED Displays
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Temperature Control Equipment
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Tablets
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Programmable Controllers
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Industrial Control Machines
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Industrial Instruments
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Touch Screens
Applications
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Industrial Automation:
Interface with PLCs, sensors, and controllers, allowing seamless communication with legacy equipment using RS232, RS485, or RS422 standards.
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Data Acquisition:
Collect data from sensors and devices in environments like manufacturing facilities, research labs, and monitoring systems.
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Embedded Systems Integration:
Connect embedded systems or microcontrollers to RS485, RS232, or RS422 devices for real-time communication.
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Communication Networks:
Utilize the module for building or expanding communication systems in industrial, commercial, or remote environments where long-distance communication is required.
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Point-to-Point or Multi-Point Communication:
Easily connect devices for point-to-point or multi-point communication, suitable for applications ranging from factory equipment to telemetry systems.
Easy Connection
Simply plug in and install the driver to start using.
Driver Installation Steps:
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Download the driver installation package.
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Double-click the .exe file to run the installation.
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Once the installation is successful, the device is ready for use.
How to Check the USB Driver:
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Right-click "My Computer" and select "Properties."
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Click on "Device Manager."
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When the computer connects to the USB, a USB serial device (COM) will appear in the Device Manager.
1. General Shipping Information
- We provide premium shipping methods with a tracking number for each order.
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Shipping address should be input in English without any special symbols to help the courier company recognize your address in the system. We will ship according to the shipping address you provided. Please notify us of any address change before your order is marked "Shipped" to avoid parcel loss.
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Please contact our customer service staff immediately if you need to cancel or change an order. Once your order has reached "Shipped" status, it can no longer be canceled or changed in any way. To avoid complications, please recheck your shopping cart before checkout.
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We can ship all in-stock orders within 1 business day as your order has been confirmed.
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All items are inspected before dispatch and are carefully hand-packed.
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With standard courier practice, you need to check the contents of the parcel before signing for your goods. Otherwise, we will not be held responsible for any damage that may have occurred in transit.
2. Shipping Options & Rates (United States)
(For Products in the US Warehouse & Global Warehouse)
2.1 Continental U.S. (50 States)
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| USPS Ground Advantage | $0.00 - $5.00 | $9.99 | 3-7 Business Days |
| USPS Ground Advantage | $5.00 - $50.00 | $5.99 | 3-7 Business Days |
| USPS Ground Advantage | Over $50.00 | Free | 3-7 Business Days |
|
USPS Priority Mail (Faster Option) |
$0.00 - $50.00 | $19.99 | 1-4 Business Days |
| USPS Priority Mail | Over $50.00 | $17.59 | 1-4 Business Days |
2.2 Non-Continental U.S.
(Includes Alaska, Hawaii, Puerto Rico, Guam, Virgin Islands, etc.)
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| USPS Ground Advantage | $0.00 - $5.00 | $9.99 | 5-9 Business Days |
| USPS Ground Advantage | $5.00 - $70.00 | $7.99 | 5-9 Business Days |
| USPS Ground Advantage | Over $70.00 | Free | 5-9 Business Days |
Important Notice:
- Before placing your order, please check the inventory location on the product page to confirm the delivery timeframes.
- For products stored in the Global Warehouse (Shenzhen), we will ship them directly from China.
- If you place an order for products from both the U.S. warehouse and the Global warehouse, we will ship your order separately: the products from the Global warehouse will be sent from China, and the products from the U.S. warehouse will be sent from the U.S. warehouse.
3. Warehouse Locations
Our products are stored in both our U.S. and Global warehouses to provide more flexible logistics solutions. On each product's description page, we indicate the specific warehouse location.
3.1 U.S. Warehouse
Located in Dover, Delaware (19901).
For products stored here, we use USPS for shipping. Logistics within U.S. are very efficient, with an estimated delivery time of 3-7 business days.
For products stored here, we use USPS for shipping. Logistics within U.S. are very efficient, with an estimated delivery time of 3-7 business days.
3.2 Global Warehouse (China)
Located in Shenzhen, Guangdong.
For orders shipping from our Global Warehouse, we typically use YunExpress. Given the complexities of international shipping, the estimated delivery time is around 10 business days, though this may vary due to customs processes.
To ensure that your order is delivered within your desired timeframe, we recommend reviewing the warehouse information provided on the product pages before placing your order.
4. Customs and Taxes
Effective Date: December 10, 2025
At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.
1. Warranty Policy
A. Standard Limited Warranty (Global & US)
For customers in the United States, Asia, and other non-EU regions:
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Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.
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Coverage: This warranty covers defects in material and workmanship under normal use.
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Resolution: We will repair or replace defective units at no charge.
B. Statutory Rights for EU/UK Customers (EU Compliance)
If you are a consumer residing in the European Union or the UK purchasing from our global site:
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Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.
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Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.
C. Warranty Exclusions (Applies to ALL Regions)
Warranty coverage is VOID if the damage is caused by:
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Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.
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Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.
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Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).
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Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.
Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.
2. Return & Refund Policy
A. Return Window
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Standard: You may request a return within 31 days of receiving your order.
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EU Customers: You have the statutory right to withdraw from the contract within 14 days of receipt without giving a reason.
B. Refund Conditions & Restocking Fees
To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.
1. Full Refund (100%)
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The item is Brand New, Unopened, and Unused.
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The original packaging is intact and sealed.
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All accessories are present.
2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (or "Compensation for Loss of Value" for EU customers) from the refund.
Deductions apply if:
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Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.
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Damaged Packaging: Original box is torn, written on, or missing.
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Technical Modification: The device has been powered on, programmed/flashed, or soldered.
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Broken Seals: Anti-static bags or security seals have been opened.
Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.
C. Shipping Costs
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Defective / Wrong Item: OpenELAB covers the return shipping cost.
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Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.
3. Return Process (RMA)
To ensure a smooth return process, please follow these steps:
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Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.
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RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.
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Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).
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Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
