The Ebyte E810-R12 is an industrial-grade 1-to-2 RS485 photoelectric isolation hub and repeater featuring DC 8-28V wide voltage input, 1.5KV galvanic isolation, and EMC Level 3 protection (4KV Contact ESD, 2KV Surge). It offers zero-delay transparent data transmission with configurable baud rates from 300 to 230,000 bps for robust noise immunity in harsh automation networks.
| Specification / Model | E810-R12 | E810-R14 | E810-R18 |
|---|---|---|---|
| Expansion Paths | 1-Way Master to 2-Way Slave RS485 | 1-Way Master to 4-Way Slave RS485 | 1-Way Master to 8-Way Slave RS485 |
| Operating Voltage | DC 8 to 28V | DC 8 to 28V | DC 8 to 28V |
| Baud Rate Range | 300 to 230400 bps (Custom Supported) | 300 to 230400 bps (Custom Supported) | 300 to 230400 bps (Custom Supported) |
| Isolation Voltage | 1.5 KV RMS Photoelectric Isolation | 1.5 KV RMS Photoelectric Isolation | 1.5 KV RMS Photoelectric Isolation |
| EMC Protection Level | Industrial EMC Level 3 | Industrial EMC Level 3 | Industrial EMC Level 3 |
| ESD / Surge Protection | Contact 4KV, Air 8KV / Differential 1KV, Common 2KV | Contact 4KV, Air 8KV / Differential 1KV, Common 2KV | Contact 4KV, Air 8KV / Differential 1KV, Common 2KV |
| Terminal Interface | 5.08mm Plug-in Copper Terminals | 5.08mm Plug-in Terminals | 3.81mm Plug-in Terminals |
| Dimensions (L x W x H) | 100 x 54 x 32 mm | 120 x 72 x 34 mm | 120 x 72 x 34 mm |
| Weight | 70 grams (margin 5g) | 120 grams (margin 5g) | 120 grams (margin 5g) |
| Operating Temp / Humidity | -40 to 85 deg C, 5% to 95% RH (Non-condensing) | -40 to 85 deg C, 5% to 95% RH (Non-condensing) | -40 to 85 deg C, 5% to 95% RH (Non-condensing) |
| Parameter Name | Parameter Value | Description |
| General parameters | Data interface | RS-485 interface |
| Baud rate | 300~230400, support custom baud rate | |
| Operating voltage | DC 8~28V | |
| Protection level | Industrial EMC3 level | |
| Isolation voltage | 1.5KV | |
| Static protection level | Contact 4 KV, air 8KV | |
| Pulse surge | Differential mode 1KV, common mode 2KV | |
| Operating temperature and humidity | -40~85℃, 5%~95% (no condensation) | |
| Storage temperature and humidity | -40~105℃, 5%~95% (no condensation) | |
| Ground terminal | Support | |
| Difference Parameters | Number of expansion paths | E810-R12: 2-way RS-485 |
| E810-R14: 4-way RS-485 | ||
| E810-R18: 8-way RS-485 | ||
| Product dimensions | E810-R12:100×54×32mm | |
| E810-R14:120×72×34mm | ||
| E810-R18:120×72×34mm | ||
| Product weight | E810-R12:70±5g | |
| E810-R14:120±5g | ||
| E810-R18:120±5g | ||
| Interface standards | E810-R12: 5.08mm copper pin plug-in terminal | |
| E810-R14: 5.08mm plug-in terminal | ||
| E810-R18: 3.81mm plug-in terminal |
Practical Application Scenarios
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Modbus RTU PLC Bus Splitting in Industrial Automation
In factory automation networks, connecting multiple RS485 slave sensors directly to a single PLC master channel often leads to signal degradation and ground loop interference. The E810-R12 splits 1 master RS485 channel into 2 isolated output channels, allowing engineers to extend transmission distance, maintain signal integrity, and eliminate ground potential differences across separate production lines.
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Smart Energy Monitoring and AMR Systems
When deployed alongside Ebyte Wireless Modbus DTUs (such as the E810-DTU series) or Modbus Gateways in smart grid metering projects, the E810-R12 serves as a multi-drop bus branch hub. It protects central RS485 data acquisition nodes from line surges while aggregating power meter readings from dual branch circuits without modifying protocol payloads.
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High-Noise Security Access Control and Building Management Systems (BMS)
In modern BMS deployments, long-distance RS485 wiring for card readers and access controllers can suffer from ESD and voltage spikes caused by heavy motor drives. Integrating the E810-R12 provides 1.5KV photoelectric isolation and EMC Level 3 surge protection, ensuring continuous transparent data relay between host servers and access gates across multiple floors.
FAQ Section
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How does the E810-R12 handle baud rate matching and data flow control during transparent transmission?
The E810-R12 features auto-sensing hardware flow control and hardware-level baud rate adaptation supporting standard rates from 300 to 230,000 bps without software configuration. It relays transparent serial frames instantly across master and slave ports, maintaining compatibility with all standard Modbus RTU and custom RS485 protocols.
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What surge and ESD protection mechanisms are implemented on the RS485 communication channels?
The hub implements Industrial EMC Level 3 protection, featuring 1.5KV RMS photoelectric power and signal isolation, Contact ESD protection up to 4KV, Air Discharge ESD protection up to 8KV, and differential-mode surge protection up to 1KV (common-mode 2KV). This prevents high-voltage transients from damaging upstream controllers or PLCs.
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Can the E810-R12 be daisy-chained or combined with Ebyte wireless DTU modules to expand network topology?
Yes. The E810-R12 can act as a physical repeater or tree-topology splitter ahead of Ebyte wireless RS485 DTUs (e.g., LoRa or 4G DTU gateways). By isolating physical copper loops prior to radio transmission, it eliminates local ground loop currents and stabilizes serial bus communication across multi-node topologies.
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What hardware terminal interfaces and power supply ranges are supported for industrial cabinet mounting?
The unit operates within a wide DC 8V to 28V power supply window, making it fully compatible with standard 12V and 24V industrial power buses. It uses detachable 5.08mm copper plug-in terminal blocks for quick field wiring and supports DIN-rail or screw mounting options.
