The Westermo MD-62 ST 820nm is an RS-232 to fiber optic converter engineered for point-to-point industrial communication. It transmits serial data over single-mode or multimode fiber, achieving transmission distances up to 25 km while maintaining immunity to electrical interference. The converter supports data rates to 115.2 kbit/s and operates transparently across all character codes.
The MD-62 uses ST connectors at 820 nm wavelength and features galvanic isolation rated at 1500 V RMS (AC models) or 500 V RMS (DC models). Its asynchronous transmission mode supports full duplex, half duplex, or simplex operation, with status signal transfer capability. The unit configures as DCE (Data Communication Equipment) via RS-232 interface, accepting either a 9-position D-sub female connector or detachable screw terminal.
DIN-rail mounting enables rapid integration into control cabinets and industrial panels. Front-panel indicators display power status, transmitted data from fiber (TD), received data from RS-232 (RD), request-to-send (RTS), and clear-to-send (CTS). Configuration uses DIP switches located under an accessible lid.
Technical Specifications
• Serial Interface: EIA RS-232/CCITT V.24, DCE configuration
• Connector Options: 9-pin D-sub female or 9-position detachable screw terminal
• Fiber Optic Interface: ST connectors, 820 nm wavelength
• Fiber Compatibility: Single-mode or multimode cable
• Data Rate: Up to 115.2 kbit/s
• Transmission Distance: Up to 25 km with single-mode fiber
• Transmission Mode: Asynchronous, full/half duplex or simplex
• Operating Temperature: 5–50 °C ambient
• Humidity: 0–95 % RH without condensation
• Galvanic Isolation: 1500 V RMS (AC), 500 V RMS (DC)
– Key Features
• Code-independent transparent operation
• Status signal transfer support
• Multiple power supply options: 207–264 VAC, 103–132 VAC, 12–36 VDC, or 36–55 VDC
• Low power consumption: 5 VA (AC models), 3 W (DC models)
• Fused protection with 100 mA or 1.6 A cartridge fuses
• Electrical noise immunity for harsh industrial environments
– Typical Applications
• Serial data transmission across electrical noise-prone sites
• Industrial automation and process control over extended distances
• Remote equipment monitoring and diagnostics
• Point-to-point telemetry links requiring galvanic isolation
– Compatibility & Integration
The MD-62 pairs with an MD-63 unit to convert RS-232 to RS-422/485 over fiber. DIN-rail mounting accommodates standard industrial enclosures.
