Gravity: UART Fiber Optic Transceiver Module
๐ฆ 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.
Gravity: UART Fiber Optic Transceiver Module
Break free from the limitations of traditional cabling with the **Gravity: UART Fiber Optic Transceiver Module** from DFRobot. Say goodbye to bulky shielded twisted pairs and unstable, slow data rates over long distances. This innovative module redefines long-range communication, offering unparalleled speed, stability, and immunity to interference.
Experience robust and reliable data transmission up to **10 kilometers**, thanks to its **complete electrical isolation**. This crucial feature eliminates electromagnetic interference, ensuring your communication remains crystal clear, even in the most challenging industrial environments. Supporting baud rates of up to **2,000,000 baud**, this transceiver maintains full speed performance regardless of the transmission distance. Built for resilience, it includes **lightning protection** and seamlessly integrates with **shared cable trunking**. Furthermore, its versatile design allows for the creation of **one-to-many star networks** using passive optical splitters, expanding your connectivity options.
Explore Our Projects
Project 1. How UART Protocol Works - Gravity: UART Fiber Optic Transceiver Module
Introduction:
In this video, we will talk about the UART protocol. We're using Gravity: UART Fiber Optic Transceiver Module, which runs at 2000000 baud at any time within a distance of up to 10km, to make a weather station.
Make a Weather Station Using Environmental Sensor
Project 2. Make a Weather Station Using Environmental Sensor
Introduction:
However, it only tells temperature in a relatively large range. Sometimes we need environmental parameters in a specific place like a fishpond, greenhouse, an open field, etc. Here I want to know the exact temperatures during a day on my terrace. So I decide to make a weather monitoring station that outputs the real-time data I need.
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Key Features
- **Complete electrical isolation** to prevent electromagnetic interference
- Supports **up to 2,000,000 baud** data rate
- **Communication distance up to 10km** using **single-mode fiber**
- **SC fiber-optic interface** with 1310nm operating wavelength
- Includes **lightning protection**, ideal for industrial applications
- Compatible with **3.3V or 5V signal systems**
- Suitable for **fiber-optic communication** and **one-to-many star networking**
- **Compact and cost-effective** alternative to traditional shielded twisted pair
Specifications
- **Supply Voltage**: 3.3V to 5V
- **Signal Voltage**: 3.3V to 5V
- **Max Baud Rate**: 2,000,000
- **Communication Distance**: Up to 10km
- **Operating Wavelength**: 1310nm
- **Fiber Optic Type**: Single Mode
- **Interface**: SC Fiber Optic
- **Operating Temperature**: 0โ to 70โ
Interface & Indicators
- **Gravity: UART Connector** โ Connects to MCU or sensor
- **PWR LED** โ Power indicator (lights when powered)
- **SD LED** โ Indicates fiber disconnection
- **TX LED** โ Blinks when transmitting fiber-optic signal
- **RX LED** โ Blinks when receiving fiber-optic signal
- **SC Fiber Optic Interface** โ Connects to SC fiber cable
Note: The SD LED does not detect all fiber disconnections or unstable transmissions. For accurate troubleshooting, use tools like a red pen or optical power meter.
Typical Application Diagram
Connect one transceiver to your **MCU** and the other to a **sensor or second MCU** using a single-mode fiber optic cable. The UART connectors allow simple interfacing with most standard microcontrollers.
Shipping List
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.
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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 |
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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 |
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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.
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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
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.
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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:ย OpenELAB provides aย 12-monthย warranty from the date of delivery.
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Coverage:ย This warranty covers defects in material and workmanship under normal use.
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Resolution:ย 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:ย You are entitled to aย 24-month statutory guaranteeย for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.
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Relation:ย 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 isย VOIDย if the damage is caused by:
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Misuse:ย Incorrect installation, reverse polarity, or exceeding voltage limits.
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Unauthorized Modification:ย This explicitly includesย soldering, cutting pins, modifying the PCB, orย flashing unauthorized/beta firmwareย that "bricks" the device.
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Physical Damage:ย Drops, moisture/water damage, or electrical surges (lightning).
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Normal Wear & Tear:ย 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:ย You may request a return withinย 31 daysย of receiving your order.
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EU Customers:ย You have the statutory right to withdraw from the contract withinย 14 daysย 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 isย 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 aย Restocking Feeย (or "Compensation for Loss of Value" for EU customers) from the refund.
Deductions apply if:
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Signs of Use:ย Visible scratches, mounting marks on screw holes, or fingerprints.
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Damaged Packaging:ย Original box is torn, written on, or missing.
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Technical Modification:ย The device has beenย powered on, programmed/flashed, or soldered.
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Broken Seals:ย Anti-static bags or security seals have been opened.
Depending on the severity of the usage/damage, the deduction may range fromย 15% to 50%ย 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:ย OpenELAB covers the return shipping cost.
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Customer Remorse (Changed Mind / Ordered Wrong Item):ย Theย customerย 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:ย Contact us atย info@openelab.ioย before returning any item. Returns without prior authorization will not be accepted.
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RMA Number:ย We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.
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Packing:ย 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:ย We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
