Isolated RS232 To RS232 Repeater
Isolated RS232 to RS232 Repeater UC-ISO-232-232
The UC-ISO-232-232 is an industrial-grade isolated RS232 to RS232 repeater designed to provide complete galvanic isolation between two RS232 devices. Featuring 2.5 kVrms signal isolation and 1 kVrms power isolation, it prevents dangerous ground loops, suppresses high-voltage electrical surges, and safeguards delicate serial ports on industrial PCs, PLCs, weighing controllers, and instrumentation.
Key Features
- 2.5 kV RMS optical signal isolation and 1.0 kV RMS power isolation
- Bi-directional full-duplex RS-232 signal repeating
- Pure hardware isolation with zero protocol configuration
- Supports standard baud rates from 300 bps to 250 kbps
- Independent LED status indicators for Power, TX, and RX
- ±15 kV ESD protection across all signal lines
- 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
Applications
- Ground Loop Break: Completely breaks common ground connections between industrial equipment connected across different electrical panels.
- Serial Port Protection: Protects expensive PLC communication cards and PC serial ports from line surges and lightning strikes.
- Noise Isolation in Substation Environments: Eliminates common-mode interference on RS232 links in power substations and heavy manufacturing plants.
- Weighbridge & Industrial Instrument Interfacing: Isolates sensitive load-cell transmitters and digital indicators from host PCs.
Specifications
| Parameter |
Value |
| Mounting Type |
35 mm DIN Rail Mounting |
| Dimensions |
110 mm x 50 mm x 55 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 |
9V ~ 24V DC (nominal 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 |
| RS232 Ports |
2x DB9 Male connectors (DCE configuration) |
| RS232 Maximum Input Level |
\(\pm 30\text{V}\) DC max |
| RS232 Output Voltage Level |
\(\pm 7\text{V}\) nominal |
Isolation & Protection Specifications
| Parameter |
Value |
Standard / Notes |
| Galvanic Signal Isolation |
2,500 V RMS |
Galvanic barrier between Port 1 and Port 2 |
| Power Isolation |
1,000 V RMS |
Isolated internal DC-DC converter |
| Reverse Polarity Protection |
Integrated |
Series diode on DC power input |
| ESD Immunity |
\(\pm 15\text{kV}\) Air / \(\pm 8\text{kV}\) Contact |
IEC 61000-4-2 Air Discharge and Contact Discharge |
| Surge Clamping |
600W TVS |
TVS clamping across all communication pins |
LED Indications and Diagnostics
| LED |
Color |
Status |
Description |
| PWR |
Red |
ON |
Operating power connected |
| TX |
Red |
Blinking |
RS232 Data transmission active |
| RX |
Green |
Blinking |
RS232 Data reception active |
Mechanical Dimensions
Terminal Details & Port Pinouts
Top Port: RS232 Port 1 (DB9 Male)
| DB9 Pin |
Signal |
Direction |
Description |
| 2 |
RX |
Input |
RS232 Receive data (connects to host TX) |
| 3 |
TX |
Output |
RS232 Transmit data (connects to host RX) |
| 5 |
GND |
Ground |
Signal Ground reference |
| 1, 4, 6, 7, 8, 9 |
NC |
– |
No connection |
Bottom Port: RS232 Port 2 (DB9 Male) & Power Supply
| Pin / Terminal |
Label |
Signal |
Description |
| DB9 Pin 2 |
RX |
Input |
RS232 Receive data (connects to device TX) |
| DB9 Pin 3 |
TX |
Output |
RS232 Transmit data (connects to device RX) |
| DB9 Pin 5 |
GND |
Ground |
Isolated Signal Ground reference |
| Screw V+ |
24V+ |
Power |
Power Supply Positive (+9V to +24V DC input) |
| Screw V- |
GND |
Power |
Power Supply Negative (Ground return) |
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
Website: www.veawe.io
Email: info@veawe.io