ExpertDAQ EX9520 RS232 to RS485 Isolated Converter
Overview
The ExpertDAQ EX9520 is an isolated RS232 to RS485 converter that connects a single RS232 device to the RS485 multi-drop network, allowing up to 256 devices to communicate over a distance of 1200 metres. Built for industrial temperature conditions from -25 to +75 °C and featuring 3000 VDC isolation on the RS232 side, the converter protects control equipment from ground potential differences and electrical noise that are common in industrial plants.
Seven Star LLC supplies the ExpertDAQ EX9520 converter for automation and instrumentation projects across the Sultanate of Oman and the GCC. SCADA systems, PLCs, weighbridges, and field instruments frequently need RS232-to-RS485 conversion, and our team provides genuine ExpertDAQ hardware with regional delivery to Muscat, Sohar, Salalah, and beyond.
Operating Principle
RS232 links a single device to a single host over short distances, while RS485 is the standard multi-drop network for industrial field devices: many devices on one twisted pair, communicating over long distances. The EX9520 converts between the two: the RS232 side connects to the host or instrument, and the RS485 side joins the multi-drop network carrying the data to and from every device on the bus.
The converter implements automatic flow control and automatic baud rate detection, so no handshake wiring or manual configuration is required for the RS232 side. Data flow is managed transparently, and the converter can also operate as an RS232 bridge for direct serial device interconnection.
Engineering Design of the ExpertDAQ EX9520
The EX9520 is built for permanent industrial installation: a wide operating temperature range of -25 to +75 °C covers cabinet and outdoor enclosure duty in Gulf climates, and the 3000 VDC isolation between the RS232 side and the network protects the host equipment from ground loops. Powering options suit the EX9520 and its extended-range variant the EX9520+, which supports a 9-48 V DC supply for wider plant compatibility.
For networks that must exceed the 1200-metre limit, ExpertDAQ offers the EX9510 repeater for extended RS485 installations.
Key Features
The ExpertDAQ EX9520 is specified for reliable RS232 to RS485 conversion in industrial networks. Its defining characteristics are:
- Isolated RS232 to RS485 converter with 3000 VDC isolation on the RS232 side.
- Operating temperature range of -25 to +75 °C.
- Automatic flow control and automatic baud rate detection.
- Supports up to 256 devices on the RS485 network.
- Maximum network length of 1200 metres.
- RS232 bridge capability for direct serial interconnection.
- Extended variants (EX9520+) support 9-48 V DC supply.
- Supplied by Seven Star LLC for automation projects across Oman and the GCC.
Industrial Applications
The EX9520 is the connection point between short-range serial equipment and the plant-wide RS485 network. Common applications include connecting SCADA host PCs, weighbridge indicators, barcode and label equipment, and single serial instruments to multi-drop networks of meters, drives, and I/O modules. Its isolation makes it the preferred choice where field devices are distributed across different earth potentials — typical in water stations, tank farms, and industrial yards.
Seven Star LLC supports automation engineers across the Sultanate of Oman and the GCC with the ExpertDAQ EX9520 and the complete ExpertDAQ serial networking range. We provide genuine converters, network guidance, and regional stock, so that serial integration projects from Muscat to Salalah are built on authentic, documented components.
Technical Specifications
The following table summarises the key parameters of the ExpertDAQ EX9520 converter:
| Parameter | Specification |
|---|---|
| Model | ExpertDAQ EX9520 |
| Product type | Isolated RS232 to RS485 converter |
| Isolation | 3000 VDC on RS232 side |
| Operating temperature | -25 to +75 °C |
| RS485 devices | Up to 256 |
| Network length | Up to 1200 m |
| Flow control | Automatic |
| Baud rate detection | Automatic |
Call To Action
Request a formal quotation for the ExpertDAQ EX9520 converter through the Seven Star LLC RFQ portal, and our team will confirm availability from regional stock and delivery to Oman or any GCC destination. As a trusted supplier of ExpertDAQ serial networking hardware in the region, we also provide datasheets and network design guidance. Contact Seven Star LLC today.
Installation Notes for RS485 Networks
When installing the EX9520, follow standard RS485 practice: terminate the bus ends correctly, observe the polarity of the twisted pair, and confirm the baud rate settings of the connected devices. The 3000 VDC isolation protects the RS232-side equipment from ground potential differences between distributed devices. Where network length exceeds 1200 metres, the ExpertDAQ EX9510 repeater extends the bus. Seven Star LLC supports serial network projects across Oman and the GCC with genuine ExpertDAQ stock and design guidance.
ExpertDAQ, a product line of TOPSCCC Technology Co., Ltd. (Taipei, Taiwan, founded 1987), specialises in remote I/O modules, serial-to-field-bus converters, analog and digital interface hardware, and embedded industrial communication devices. Their modules support RS-232, RS-485, Modbus, Ethernet and are used widely in building automation, machine automation, facility-management systems, power & energy, and industrial control networks. The ExpertDAQ series is noted for rugged build quality, wide temperature range operation, modular expansion and quick integration into industrial environments. Seven Star LLC supplies genuine ExpertDAQ modules and converters for industrial automation projects across Oman and the Middle East.
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