1. Introduction
The UOTEK UT-208 is an industrial-grade isolated converter designed to facilitate reliable communication between RS-232 and RS-485/RS-422 interfaces. It features built-in optical isolation, providing enhanced protection against electrical interference and ground loops, making it suitable for various industrial automation and data communication applications. This manual provides detailed instructions for the proper installation, operation, and maintenance of the UT-208 converter.
2. Features
- Automatic Data Direction Control: Ensures real TXD/RXD/GND communication without manual intervention.
- Wide Baud Rate Range: Supports data transmission from 300bps up to 115.2Kbps.
- Long Transmission Distance: Capable of transmitting data up to 5,000 meters at 9,600bps.
- Robust Protection:
- RS-232 interface: +/-15KV ESD protection.
- RS-422/RS-485 interface: 600W surge protection per line.
- Optical Isolation: Built-in optical isolation for electrical separation and noise reduction.
- Flexible Working Modes: Supports asynchronous half-duplex (RS-485) or full-duplex (RS-422) operation.
- Plug & Play: Compatible with all standard communication software and operating systems.
3. Package Contents
Verify that all items are present in the package:
- UOTEK UT-208 RS232 to RS485/RS422 Isolated Converter
- Power Adapter
- RS-232 Cable (DB9 to DB9)
- Terminal Block for RS-485/RS-422 connections
Image 3.1: Package contents of the UOTEK UT-208 converter.
4. Product Overview
The UT-208 converter features a robust metal casing with clearly labeled ports and indicator lights for easy monitoring of its status.
Image 4.1: Front view of the UOTEK UT-208 converter, highlighting the RS-232 (DB9) and RS-485/422 (terminal block) interfaces.
Image 4.2: Indicator lights on the UT-208 converter. TXD (green) indicates data transmission, RXD (yellow) indicates data reception, and PWR (red) indicates power status.
4.1. Interface Ports
- RS-232 Port: Standard DB9 male connector for connecting to RS-232 devices.
- RS-485/RS-422 Port: Terminal block for connecting to RS-485 or RS-422 devices.
4.2. Indicator Lights
- PWR (Red): Illuminates when the device is powered on.
- TXD (Green): Flashes when data is being transmitted from the RS-232 side to the RS-485/RS-422 side.
- RXD (Yellow): Flashes when data is being received by the RS-232 side from the RS-485/RS-422 side.
5. Setup and Installation
Follow these steps to set up your UOTEK UT-208 converter:
- Connect Power: Plug the provided power adapter into the DC input port of the UT-208 converter and then into a standard electrical outlet. The PWR indicator light should illuminate.
- Connect RS-232 Device: Use the supplied RS-232 cable to connect the DB9 male connector of the UT-208 to the RS-232 port of your host device (e.g., computer, PLC).
- Connect RS-485/RS-422 Device:
- For RS-485 (2-wire half-duplex): Connect the A and B terminals of the UT-208 to the corresponding A and B terminals of your RS-485 device. Ensure proper polarity.
- For RS-422 (4-wire full-duplex): Connect the TX+, TX-, RX+, RX- terminals of the UT-208 to the corresponding RX+, RX-, TX+, TX- terminals of your RS-422 device. Ensure proper polarity.
- Verify Connections: Double-check all cable connections to ensure they are secure and correctly wired according to the interface standards.
6. Operating Instructions
Once the UT-208 converter is properly connected, it operates automatically. The converter's intelligent circuitry handles data direction control for RS-485, eliminating the need for external flow control signals.
- Data Transmission: When your RS-232 device sends data, the TXD indicator on the UT-208 will flash, and the data will be converted and transmitted over the RS-485/RS-422 network.
- Data Reception: When data is received from the RS-485/RS-422 network, the RXD indicator on the UT-208 will flash, and the data will be converted and sent to your RS-232 device.
- Software Configuration: Ensure that your communication software on the RS-232 host device is configured with the correct baud rate, data bits, stop bits, and parity settings to match the RS-485/RS-422 network. The UT-208 supports a wide range of standard baud rates.
7. Maintenance
The UOTEK UT-208 converter is designed for reliable, long-term operation with minimal maintenance. Follow these guidelines to ensure optimal performance:
- Keep Clean: Regularly clean the exterior of the device with a soft, dry cloth. Avoid using liquid cleaners or solvents.
- Environmental Conditions: Operate the converter within its specified temperature and humidity ranges. Avoid exposure to extreme temperatures, direct sunlight, or high moisture environments.
- Cable Integrity: Periodically inspect all connected cables for any signs of damage or wear. Replace damaged cables immediately.
- Secure Connections: Ensure that all cable connections remain tight and secure to prevent intermittent communication issues.
8. Troubleshooting
If you encounter issues with your UT-208 converter, refer to the following troubleshooting tips:
| Problem | Possible Cause | Solution |
|---|---|---|
| PWR indicator is off | No power supply or faulty adapter. | Check power adapter connection to the converter and wall outlet. Ensure the outlet is functional. Test with another power adapter if available. |
| No data transmission/reception (TXD/RXD indicators not flashing) | Incorrect wiring, incorrect software settings, or faulty cables. | Verify RS-232 and RS-485/RS-422 wiring for correct polarity and connections. Check communication software settings (baud rate, data bits, parity, stop bits) to match the network. Replace cables if suspected faulty. |
| Intermittent communication | Loose connections, electrical noise, or impedance mismatch. | Ensure all connections are secure. Check for sources of electrical interference. For RS-485/RS-422, ensure proper termination resistors are used if required by the network design. |
| Device not recognized by host | Driver issue (for USB-to-RS232 adapters used with the converter) or faulty RS-232 port. | Ensure any necessary drivers for your RS-232 host port or USB-to-RS232 adapter are installed correctly. Test the RS-232 port with another device if possible. |
9. Specifications
| Parameter | Value |
|---|---|
| Model Number | UT-208 |
| Interface Standard | RS-232, RS-485, RS-422 |
| Connector Type | DB9 (RS-232), Terminal Block (RS-485/RS-422) |
| Working Mode | Asynchronous Half-Duplex (RS-485), Full-Duplex (RS-422) |
| Baud Rate | 300bps - 115.2Kbps |
| Transmission Distance | Up to 5,000m (at 9,600bps) |
| Isolation | Optical Isolation |
| Protection | RS-232: +/-15KV ESD; RS-422/RS-485: 600W Surge per line |
| Power Supply | External DC Power Adapter |
| Housing Material | ABS (Finish Type) |
| Item Weight | 14.8 ounces |
| Package Dimensions | 11.06 x 6.65 x 2.64 inches |
| Operating System Support | All operating systems (Plug & Play) |
10. Warranty and Support
UOTEK products are designed for reliability and performance. For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact UOTEK customer support directly. Refer to the official UOTEK website or your purchase documentation for contact information.
Manufacturer: UTEK TECHNOLOGY (SHENZHEN) CO., LTD
Official Store: Visit the UOTEK Store on Amazon
