RS485 to RS485 Repeater UC-RS485-RS485
RS485 to RS485 Repeater UC-RS485-RS485
The UC-RS485-RS485 is a compact, inline industrial RS485 to RS485 signal repeater. Engineered to amplify and reshape differential serial signals, it effectively extends RS485 network spans by an additional 1,200 meters (4,000 feet) and allows adding up to 256 additional devices without loading down existing bus transceivers.
Key Features
- Non-isolated RS-485 to RS-485 signal repeater and bus booster
- Extends RS-485 transmission distance by an additional 1,200 m
- Expands network capacity by adding up to 256 nodes
- Hardware automatic send data direction control with zero packet latency
- Supports standard baud rates from 300 bps to 250 kbps
- ±15 kV ESD protection across all communication lines
- Independent LED status indicators for Power, TX, and RX
- 9V to 30V DC industrial power supply input (nominal 24V DC)
- 35 mm DIN rail and wall mountable housing
- Dimensions: 110 mm × 50 mm × 55 mm
Ordering Information
| Product Code | Description |
|---|---|
| UC-RS485-RS485 | RS485 to RS485 Repeater (Non-Isolated, 6~24V DC, 256 Nodes) |
| SPD-RS485 | Surge Protection Device RS485 |
| UC-ISO-485-485 | Isolated RS485 To RS485 Repeater (2.5kVrms Isolation) |
| UC-RS485 | USB to RS485 Converter |
| UC-ETH-RS485-D | Ethernet to Dual RS485 Converter |
Applications
- Long-Haul Cable Expansion: Reconditioning differential signals across long factory, tunnel, or building cable runs.
- High-Density Sensor Loops: Multiplying node counts on extensive solar monitoring or building automation Modbus networks.
- Network Branching & Segment Isolation: Buffering separate bus segments to isolate local physical cable faults from the primary backbone.
- OEM Control Cabinets: Compact inline booster easily tucked into control panels and junction boxes.
Specifications
| Parameter | Value |
|---|---|
| Mounting Type | Inline / Panel Mountable |
| Dimensions | 60 mm x 40 mm x 20 mm (L x W x H) |
| Enclosure Material | Industrial ABS Plastic |
| Operating Temperature | 0 °C to +85 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% RH (non-condensing) |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Power Supply | 6V ~ 24V DC (nominal 12V/24V DC) |
| Working Current | 200 mA Max |
| Baud Rate Range | 300 bps to 250 kbps |
| Data Format | 7/8 Data bits, 1/2 Stop bits, None/Even/Odd Parity |
| Node Expansion | Up to 256 receivers per repeated segment |
| RS485 Input Receiver Range | \(\pm 12\text{V}\) between A and B max |
| RS485 Input Termination | No internal termination resistor (prevents mid-bus loading) |
| RS485 Output Transmit Output | Line A pulled up (+5V), Line B pulled down (0V) |
Isolation & Protection Specifications
| Parameter | Value | Standard / Notes |
|---|---|---|
| Isolation Barrier | Non-Isolated | Common ground shared between input, output, and power |
| ESD Protection | \(\pm 15\text{kV}\) Air / \(\pm 8\text{kV}\) Contact | IEC 61000-4-2 Human-Body Model & Contact |
| Surge Clamping | 600W TVS | Fast bidirectional clamping diodes on all communication lines |
| Reverse Polarity | Integrated | Series protection diode on DC power input |
LED Indications and Diagnostics
| LED | Color | Status | Description |
|---|---|---|---|
| TX | Red | Blinking | Data transmission out onto repeated bus segment |
| RX | Green | Blinking | Data reception in from primary bus segment |
Mechanical Dimensions
Terminal Details & Port Pinouts
6-Pin Pluggable Screw Terminal Block
| Pin # | Label | Signal | Description |
|---|---|---|---|
| 1 | 1-IN-B | RS485-In B | Primary Bus Inverting differential data line (-) |
| 2 | 2-IN-A | RS485-In A | Primary Bus Non-inverting differential data line (+) |
| 3 | 3-OUT-B | RS485-Out B | Repeated Bus Inverting differential data line (-) |
| 4 | 4-OUT-A | RS485-Out A | Repeated Bus Non-inverting differential data line (+) |
| 5 | 5-GND | Power GND | DC Power Supply Negative (-Vin return) |
| 6 | 6-24V | Power +Vin | DC Power Supply Positive (+6V to +24V DC) |
Revision History
| Revision | Date | Description of Change |
|---|---|---|
| Rev 1.0 | 2026-09-09 | Initial datasheet release |
Get the latest version of this datasheet : click here..
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