RS232 to RS485 Converter
RS232 to RS485 Converter UC-RS232-RS485
The UC-RS232-RS485 is a compact, industrial-grade non-isolated bi-directional RS232 to RS485 converter. Designed for cost-effective interface conversion between host RS232 ports and 2-wire half-duplex RS485 networks, it features zero-latency automatic send-data direction control and built-in line termination.
Key Features
- Converts point-to-point RS-232 to 2-wire multi-drop RS-485
- Extends communication distance up to 1,200 m (4,000 ft)
- Hardware automatic direction control with zero flow control overhead
- Supports standard baud rates from 300 bps to 250 kbps
- Drives up to 256 transceiver nodes on the RS-485 bus
- ±15 kV ESD protection across all communication lines
- Independent LED status indicators for TX and RX activity
- 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-RS232-RS485 | RS232 to RS485 Converter (Non-Isolated, 6~24V DC, 256 Nodes) |
| SPD-RS485 | Surge Protection Device RS485 |
| UC-ISO-232-485 | Isolated RS232 To RS485 Converter (2.5kVrms Isolation) |
| UC-RS485 | USB to RS485 Converter |
| UC-ETH-RS485 | Ethernet to RS485 Converter |
Applications
- PLC & Controller Interfacing: Converting RS232 programming ports into multi-drop RS485 lines for fieldbus expansion.
- SCADA & Energy Metering: Connecting PC serial COM ports to Modbus RTU energy meters and digital power monitors.
- Control Panel Integration: In-cabinet signal conversion between local controllers and distributed I/O blocks.
- OEM Machine Building: Compact, lightweight interface conversion integrated directly into industrial machinery.
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 |
| RS485 Bus Receivers | Up to 256 transceiver nodes |
| RS485 Receiver Input | \(\pm 12\text{V}\) between A and B max |
| RS485 Transmit Output | Line A pulled up (+5V), Line B pulled down (0V) |
| RS485 Termination | 120 \(\Omega\) built-in between A and B |
| RS232 Connector | DB9 Male as per RS232C standard |
Isolation & Protection Specifications
| Parameter | Value | Standard / Notes |
|---|---|---|
| Isolation Barrier | Non-Isolated | Common ground shared between RS232 and RS485 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 | High-speed bidirectional TVS clamping diodes |
| Reverse Polarity | Integrated | Series protection diode on DC power input |
LED Indications and Diagnostics
| LED | Color | Status | Description |
|---|---|---|---|
| TX | Red | Blinking | RS232 host transmitting data onto RS485 bus |
| RX | Green | Blinking | RS485 field device data received into RS232 host |
Mechanical Dimensions
Terminal Details & Port Pinouts
6-Pin Screw Terminal Block (RS485 & Power)
| Pin # | Label | Signal | Description |
|---|---|---|---|
| 1 | GND | Ground | Common Signal Ground reference |
| 2 | GND | Ground | Common Signal Ground reference |
| 3 | A+ | RS485 A | Non-inverting differential data signal (+) |
| 4 | B- | RS485 B | Inverting differential data signal (-) |
| 5 | GND | Power GND | DC Power Supply Negative (-Vin return) |
| 6 | 6-24V | Power +Vin | DC Power Supply Positive (+6V to +24V DC) |
RS232 DB9 Male Connector Pinout
| DB9 Pin | Signal | Direction | Description |
|---|---|---|---|
| 2 | RX | Input | Receive Data (connects to host TX) |
| 3 | TX | Output | Transmit Data (connects to host RX) |
| 5 | GND | Ground | Signal Ground reference |
| 1, 4, 6, 7, 8, 9 | NC | – | No connection |
Typical Connection Diagram
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..
Support
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Email: info@veawe.io