Perle PSI-MOS-RS232/FO 850 E Serial to Fiber Converter Connect RS232 devices to fiber optic cable


Extend serial data up to 2.6 miles
Immune to EMI, RFI and transient surges
Point-to-point or star configuration
ST type fiber connectors
Configurable DB9 Male DTE / DCE RS232 Connector



The PSI-MOS-RS232/FO 850 E Serial to Fiber Converter transparently connects RS232 devices to fiber optic cable. By transmitting RS232 data over optical fiber, these serial media converters provide an economical path to extend the reach of serial devices.
Long Distance Serial Data Transmission over Fiber
RS232 Serial transmission is limited to 20 Kbps over a distance of only 15 meters (50 feet). Using the FO 850 E Serial to Fiber Converter you can extend your serial data transmission up to 4.2km (2.6 miles). The result is that any two pieces of asynchronous serial equipment, located miles apart, can communicate at half or full duplex over fiber optic cable at rates up to 115.2 kbps.
EMI, RFI and Transient Surge Immunity
Another advantage of the FO 850 E fiber optic transmission system is the electrically isolated connection of devices. Electromagnetic interference (EMI) is a common phenomenon in typical environments like industrial plants, warehouses and factory floors. This interference can cause corruption of data over RS232 or copper-based Ethernet links. Data transmitted over fiber optic cable however is completely immune to this type of noise, thus preventing the negative effects of voltage equalization currents and electromagnetic interference on the data cables. A Serial to Fiber Media Converter therefore enables you to inter-connect your serial devices over fiber ensuring optimal data transmission, increased availability of the system, and improved network design flexibility for point-to-point connections and star structures.
Flexible Fiber Optic Connections
The FO 850 E operates at 850 nm wavelength, using a separate LED emitter and photo-detector on ST type connectors. Almost any multimode glass fiber size can be used including 50/125 m, 62.5/125 m, and 200/230 m.
Power Budget Considerations
Calculating the power budget is critically important with planning the fiber optic link. The optical power budget is the amount of light required to transmit data successfully over distance through a fiber-optic connection. The amount of light energy available within the setup will dictate the length of the fiber optic cable run between serial media converters within the network. Optical power budgets are critical to help businesses avoid signal distortion. To learn how to calculate optical power budget read our technical note. Transmit and receive dBm can be found in the Hardware specifications.

Transmit each serial signal out over 10 fiber optic lines
Up to ten (10) Serial to Fiber Converters can be grouped together using the TBUS DIN Rail bus system for voltage and data. This allows the serial converter to operate as a star coupler, taking the serial data iput signal and distributing it to all Fiber optic output ports.
High Quality Features and Support
The FO 850 E are also equipped with comprehensive diagnostic functions to increase system availability, simplify start-up and permanently monitor the optical transmission quality. This allows for more efficient troubleshooting and less on-site maintenance. These cost and time saving features, along with free worldwide technical support, make the FO 850 E RS232 serial to fiber converter the smart choice for IT professionals.
• Connections can be plugged in using a COMBICON screw terminal block
• Supply voltage and data signals routed through via DIN rail connectors
• High-quality electrical isolation between all interfaces (RS-232, fiber optic ports, power supply, DIN rail connector)
• Redundant power supply possible by means of optional system power supply unit
• Approved for use in zone 2
• Intrinsically safe fiber optic interface (Ex op is) for direct connection to devices in zone 1
• Integrated optical diagnostics for continuous monitoring of fiber optic paths
• Floating switch contact for leading alarm generation in relation to critical fiber optic paths
• Automatic data rate detection for all data rates up to 115.2 kbps


Ambient conditions
Ambient temperature (operation) -20 °C … 60 °C
Ambient temperature (storage/transport) -40 °C … 85 °C
Permissible humidity (operation) 30 % … 95 % (non-condensing)
Altitude 5000 m (For restrictions see manufacturer’s declaration)
Degree of protection IP20
Noise immunity EN 61000-6-2:2005
Standards and Regulations
Electromagnetic compatibility Conformance with EMC Directive 2014/30/EU
Type of test Vibration resistance in acc. with EN 60068-2-6/IEC 60068-2-6
Test result 5g, 10-150 Hz, 2.5 h, in XYZ direction
Type of test Shock in acc. with EN 60068-2-27/IEC 60068-2-27
Test result 15g, 11 ms period, half-sine shock pulse
Shock 15g in all directions in acc. with IEC 60068-2-27
Noise emission EN 55011
Noise immunity EN 61000-6-2:2005
Free from substances that could impair the application of coating according to P-VW 3.10.7 57 65 0 VW-AUDI-Seat central standard
Connection in acc. with standard CUL
Standards/regulations EN 61000-4-2
EN 61000-4-3
EN 61000-4-4
EN 61000-4-5
EN 61000-4-6
Vibration (operation) In acc. with IEC 60068-2-6: 5g, 150 Hz
Conformance CE-compliant
ATEX II 3 G Ex nA nC IIC T4 Gc X
II (2) G [Ex op is Gb] IIC (PTB 06 ATEX 2042 U)
II (2) D [Ex op is Db] IIIC (PTB 06 ATEX 2042 U)
UL, USA/Canada Class I, Zone 2, AEx nc IIC T5
Class I, zone 2, Ex nC nL IIC T5 X
Class I, Div. 2, Groups A, B, C, D
Optical interface FO
Number of FO ports 1
Transmit capacity, minimum -4.6 dBm (200/230 µm)
-17.6 dBm (50/125 µm)
-13.6 dBm (62,5/125 µm)
Minimum receiver sensitivity -33.2 dBm
Wavelength 850 nm
Transmission length incl. 3 dB system reserve 2800 m (with F-K 200/230 8 dB/km with quick mounting connector)
4200 m (with F-G 50/125 2.5 dB/km)
4800 m (with F-G 62,5/125 3.0 dB/km)
Transmission medium PCF fiber
Multi-mode fiberglass
Transmission protocol Transparent to protocol for RS-232 interface
Connection method B-FOC (duplex ST®)
Transmission channels 2 (1/1), RxD, TxD, full duplex
Bit distortion, input ± 35 % (permitted)
Bit distortion, output < 6.25 % Electrical isolation VCC // V.24 (RS-232) Test voltage data interface/power supply 1.5 kVrms (50 Hz, 1 min.) Electromagnetic compatibility Conformance with EMC Directive 2014/30/EU Noise emission EN 55011 Net weight 221.1 g Housing material PA 6.6-FR Color green MTBF 320 Years (Telcordia standard, 25°C temperature, 21% operating cycle (5 days a week, 8 hours a day)) 48 Years (Telcordia standard, 40°C temperature, 34.25% operating cycle (5 days a week, 12 hours a day)) Conformance CE-compliant ATEX II 3 G Ex nA nC IIC T4 Gc X (Please follow the special installation instructions in the documentation!) II (2) G [Ex op is Gb] IIC (PTB 06 ATEX 2042 U) (Please follow the special installation instructions in the documentation!) II (2) D [Ex op is Db] IIIC (PTB 06 ATEX 2042 U) (Please follow the special installation instructions in the documentation!) UL, USA/Canada Class I, Zone 2, AEx nc IIC T5 Class I, zone 2, Ex nC nL IIC T5 X Class I, Div. 2, Groups A, B, C, D Digital outputs Output name Relay output Output description Alarm output Number of outputs 1 Maximum switching voltage 60 V DC 42 V AC Limiting continuous current 0.46 A Power supply Nominal supply voltage 24 V DC (With UL approval) Supply voltage range 18 V DC ... 30 V DC Max. current consumption 120 mA Typical current consumption 120 mA (24 V DC) Connection method COMBICON plug-in screw terminal block Serial interface Interface 1 V.24 (RS-232) interface in acc. with ITU-T V.28, EIA/TIA-232, DIN 66259-1 Connection method D-SUB 9 plug Transmission medium Copper Transmission length ≤ 15 m Conductor cross section solid min. 0.2 mm² Conductor cross section solid max. 2.5 mm² Conductor cross section flexible min. 0.2 mm² Conductor cross section flexible max. 2.5 mm² Conductor cross section AWG min. 24 Conductor cross section AWG max. 14 Serial transmission speed 115.2 kbps (NRZ) Dimensions Width 35 mm Height 99 mm Depth 105 mm Environmental Product Compliance China RoHS Environmentally Friendly Use Period = 50 Reach and RoHS Compliant Reach and RoHS Compliant Approvals cUL Listed cULus Listed UL Listed ATEX EAC DNV cUL Recognized cULus Recognized UL Recognized Commercial data Packing unit 1 Weight per piece 222.7 g Country of origin Germany Warranty 1 Year Classifications eCl@ss 4.0 27230207 eCl@ss 4.1 27230207 eCl@ss 5.0 27230207 eCl@ss 5.1 27230207 eCl@ss 6.0 27230207 eCl@ss 7.0 27230207 eCl@ss 8.0 19179290 eCl@ss 9.0 19179290 ETIM 2.0 EC001423 ETIM 3.0 EC001423 ETIM 4.0 EC001423 ETIM 5.0 EC000310 ETIM 6.0 EC000310 UNSPSC 6.01 30211506 UNSPSC 7.0901 39121008 UNSPSC 11 39121008 UNSPSC 12.01 39121008 UNSPSC 13.2 43222604


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