- Industrial Communications
- AC Drives
- Vibration Monitoring
- PLC & I/O Cards
- Automation Accessories
- Controllers & Data Acquisition
- Industrial Computers
- CCTV & Security
- Encoders
- Safety Switches & Guard Locking
- HMI Displays
- Motor Soft Starters
- Isolator & Barrier
- Pneumatic Cylinders
- Servo Drives
- Automation Software
- Robotics
- Machine Vision
Brand: ExpertDAQ
ExpertDAQ EX9520 RS232 to RS485 Isolated Converter
Description
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 converters on request with network guidance, so that serial integration projects from Muscat to Salalah are built on 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 |
Integration with Modbus and Serial Devices
The ExpertDAQ EX9520 is protocol-transparent: it converts the electrical interface but does not change the data, so it works with Modbus RTU, ASCII protocols and most proprietary serial protocols. This makes it useful when a legacy RS232 device such as a weighing indicator, analyser or older PLC must join an RS485 network, or when a PC with an RS232 port needs to poll several RS485 field instruments.
- Match the baud rate, data bits, parity and stop bits across every device on the bus.
- Give each slave device a unique address when a master polls several instruments.
- Check whether the network uses two-wire (half duplex) or four-wire (full duplex) wiring.
Commissioning Steps
Connect the RS232 side to the host with a short cable, wire the RS485 side with twisted pair cable, and apply power. Test communication with a single slave first, then add the remaining devices one at a time. A serial terminal program or Modbus test tool on a laptop is the quickest way to confirm that requests and responses pass through the converter correctly.
Troubleshooting
If no data is received, check the A/B polarity on the RS485 side, since swapped wires are the most common fault. Intermittent errors usually point to missing termination at the ends of long lines, cable routed near power conductors, or poor shield grounding. Also check that only one master is active on the bus at any time.
Use in Oman and the GCC
Isolated converters are widely used in pumping stations, substations, tank farms and weighbridges across the region, where long cable runs and ground potential differences can damage unprotected serial ports. Seven Star LLC supplies the EX9520 converter for these projects and can advise on wiring and grounding for your network.
Request a Quote for ExpertDAQ EX9520 RS232 to RS485 Isolated Converter
Request a formal quotation for the ExpertDAQ EX9520 converter through the Seven Star LLC RFQ portal, and our team will confirm availability, lead time 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 supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.
Related Products
Datasheets & Documents
- Datasheet ExpertDAQ EX9520 RS232 to RS485 Isolated Converter Datasheet Download
Reviews (0)
About brand
ExpertDAQ is the name on the EX9000 series of remote I/O modules and converters made by TOPSCCC, a Taipei company founded in 1987. The modules add analog and digital channels to a PC or controller over an RS-485 bus. Seven Star LLC, an independent supplier in Oman, lists the EX9520 isolated converter, the EX9017F analog input module, the EX9044D digital I/O module and the EX9188E5-M embedded controller.
ExpertDAQ EX9000 module families
The manufacturer sorts the EX9000 modules by function: converters, digital input and output modules, relay and solid state output modules, analog input and output modules, and counter and frequency modules. They communicate on RS-485 using Modbus RTU, and a separate group of MTCP models has an Ethernet port. The EX9188 series are small embedded controllers that can run a program locally. A typical small system uses one EX9520 to connect the RS-485 line to a serial port and a row of I/O modules behind it.
Ordering ExpertDAQ modules: what we need
Send the full model number with every suffix letter, since suffixes separate versions with a display, a faster input or a different protocol. State the protocol your software expects, the signal types and ranges, and the number of channels. For expansions of existing panels in the GCC, tell us the modules already on the bus so the new ones are requested with compatible settings.
Browse ExpertDAQ products by category: Industrial Communications.
Related products
Frequently Asked Questions
What does the ExpertDAQ EX9520 do?
The EX9520 is an isolated RS232 to RS485 converter that connects RS232 devices to multi-drop RS485 networks of up to 256 devices over 1200 metres.
What isolation does the EX9520 provide?
The converter provides 3000 VDC isolation on the RS232 side, protecting host equipment from ground potential differences and electrical noise.
What temperature range does the EX9520 cover?
The EX9520 operates from -25 to +75 deg C, covering cabinet and outdoor enclosure duty in Gulf climates.
Does the EX9520 need manual configuration?
No. The converter features automatic flow control and automatic baud rate detection, so no handshake wiring or manual settings are required on the RS232 side.
Does Seven Star LLC supply ExpertDAQ converters in Oman?
Yes. Seven Star LLC supplies genuine ExpertDAQ serial networking hardware, including the EX9520, throughout the Sultanate of Oman and the GCC with regional delivery and technical support.
Reviews
There are no reviews yet.