Description
The Perle PSI-MOS-RS485W2/FO 850 T Transceiver/Media Converter provides reliable and long-distance serial data transmission by converting RS485 2-wire signals into optical fiber. Ideal for industrial and data center environments, it offers dual ST fiber ports for redundant connections and supports distances up to 4.2 km over multimode fiber. With support for all popular protocols including Modbus ASCII/RTU, SUCONET K, S-BUS, and DH-485, this device ensures secure, noise-immune communication in harsh environments.
Designed for flexible deployment, the unit is DIN rail-mountable, environmentally compliant (RoHS, REACH, China RoHS), and backed by a 1-year limited warranty. Its robust optical isolation provides immunity against EMI, RFI, and transient surges, ensuring reliable operation even in electrically noisy industrial environments.
| Category | Details |
|---|---|
| Manufacturer | Perle Systems, Inc. |
| Part Number | 27083264 |
| Product Model | PSI-MOS-RS485W2/FO 850 T |
| Product Type | RS485 to Fiber Transceiver / Media Converter |
| Ports | 2 x ST Duplex Fiber Ports, 1 x RS485 (2-wire) |
| Fiber Type | Multimode (50/125 µm, 62.5/125 µm, 200/230 µm) |
| Wavelength | 850 nm LED |
| Max Transmission Range | Up to 4.20 km (2.6 miles) |
| Data Rate | Up to 500 kbps (half-duplex) |
| Supported Protocols | Modbus ASCII/RTU, SUCONET K, S-BUS, DH-485, others |
| Form Factor | Rail-mountable (DIN Rail) |
| Power Source | External Power Supply (24VDC USA Wall Adapter included) |
| Dimensions (H x W x D) | 3.9" x 1.4" x 4.1" (99 x 35 x 104 mm) |
| Weight | 7.41 oz (approx. 2 lbs shipping weight) |
| Environmental | RoHS, China RoHS, REACH compliant |
| Package Contents | PSI-MOS-RS485W2/FO 850 T Unit, 24VDC Power Adapter |
| Warranty | 1-Year Limited Warranty |
| Condition | New and Factory Fresh |
Payment & Security
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Return Policy (Short Summary)
We offer a 30-day return window for most unopened, factory-sealed items.
Returns must be authorized before shipping back and must include all original packaging and accessories. Opened or used items are not returnable unless defective.
Some products—such as custom orders, special-order items, audio gear, software, and LED video walls—are non-returnable. Non-defective returns may be subject to a 20–30% restocking fee, and customers are responsible for return shipping costs.
For damaged or incorrect items, please contact us immediately.
From Scope to Sign-Off
A structured delivery process designed to reduce risk and keep projects moving.
Plan
Discovery, site review, requirements gathering, and project alignment. We define scope, constraints, and success criteria before any design work begins.
- Discovery calls & stakeholder interviews
- On-site survey & infrastructure review
- Requirements & use-case documentation
- Project scope, timeline & milestone alignment
Engineer
System design, schematics, signal flow, BOM development, and documentation. Every project leaves this phase with a complete engineering package.
- AV system design & signal flow diagrams
- Equipment selection & BOM development
- Rack layout & control system design
- As-built documentation package
Deploy
Procurement, logistics, installation, programming, commissioning, and training. We own the delivery from first shipment to final handoff.
- Authorized procurement & logistics coordination
- Physical installation & cable management
- Control system programming & configuration
- Commissioning, testing & end-user training
Support
Monitoring, maintenance, lifecycle planning, and long-term service agreements. We stay engaged long after project close.
- 24/7 remote system monitoring
- Preventive & reactive maintenance
- Technology lifecycle & refresh planning
- Long-term service level agreements
A decade of delivery — trusted by 275+ clients across industries
