TCF-142 Fibre Media Converter, RS232/422/485 to SM SC

Part #: M TCF-142-S-SC

RS-232/422/485 to single-mode optical fibre media converter with fibre ring support and SC connector, 0 to 60°C operating temperature
  • Overview
  • Specifications
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  • Overview

RS-232/422/485 to optical fibre media converters

Features and Benefits 

  • “Ring” and “Point- to-Point” transmission
  • Extends RS-232/422/485 transmission up to:
    • 40 km with single-mode—TCF-142-S
    • 5 km with multi-mode—TCF-142-M
  • Decreases signal interference
  • Protects against electrical interference and chemical corrosion
  • Supports baudrates up to 921.6 kbps
  • Wide temperature models available (-40 to 75°C)


The TCF-142 media converters are equipped with a multiple interface circuit that can handle RS-232 or RS-422/485 serial interfaces and multi-mode or single-mode fibre. TCF-142 converters are used to extend serial transmission up to 5 km (TCF-142-M with multi-mode fibre) or up to 40 km (TCF-142-S with single-mode fibre). The TCF-142 converters can be configured to convert either RS-232 signals, or RS-422/485 signals, but not both at the same time.

Automatic Baudrate Detection

The TCF-142 converters can automatically detect the serial baudrate. This is an extremely convenient feature. Even if a device’s baudrate is changed, the signal will still be transmitted through the media converter without any data loss.

Ring Operation

The TCF-142 converters can be used to connect serial devices to a fibre ring. To form the ring, connect the Tx port of one TCF-142 to the Rx port of a neighboring converter. Once the ring is set up, simply use the DIP switches to configure the TCF-142 converters for “ring mode.” When one node transmits a signal, the signal travels around the ring until it returns back to the transmitting unit, which then blocks the signal. With the TCF-142, you can set up fibre rings that have a total circumference of up to 100 km.

Automatic Data Direction Control (ADDC®)

ADDC® is a patented hardware data flow solution developed by Moxa to handle RS-485 data direction control. ADDC® senses and controls RS-485 data direction automatically, making it unnecessary to use the hand shaking signal.

  • Specifications
Optical Fiber Side
Fiber ConnectorSC or ST
Cable RequirementsSingle-mode: 8.3/125, 8.7/125, 9/125, or 10/125 μm 
Multi-mode: 50/125, 62.5/125, or 100/140 μm
Transmission DistanceSingle-mode: 40 km 
Multi-mode: 5 km
WavelengthSingle-mode: 1310 nm 
Multi-mode: 850 nm
Tx OutputSingle-mode: > -5 dBm 
Multi-mode: > -5 dBm
Rx SensitivitySingle-mode: -25 dBm 
Multi-mode: -20 dBm
Point-to-Point TransmissionHalf-duplex or full-duplex
Ring TransmissionHalf-duplex
RS-232/422/485 Side
ConnectorTerminal Block
RS-232 SignalsTx, Rx, GND
RS-422 SignalsTxD+, TxD-, RxD+, RxD-, GND
RS-485-4w SignalsTxD+, TxD-, RxD+, RxD-, GND
RS-485-2w SignalsData+, Data-, GND
Baudrate50 bps to 921.6 Kbps
ESD Protection15 KV for all signals
Physical Characteristics
HousingAluminum (1 mm)
DimensionsWithout ears: 67 x 100 x 22 mm (2.64 x 3.94 x 0.87 in) 
With ears: 90 x 100 x 22 mm (3.54 x 3.94 x 0.87 in)
Weight320 g
Environmental Limits
Operating TemperatureStandard Models: 0 to 60°C (32 to 140°F) 
Wide Temp. Models: -40 to 75°C (-40 to 167°F)
Storage Temperature-40 to 75°C (-40 to 167°F)
Ambient Relative Humidity5 to 95% (non-condensing)
Power Requirements
Input Voltage12 to 48 VDC
Power Consumption140 mA @ 12 V
Power Line Protection2 KV Burst (EFT), EN61000-4-4 
2 KV Surge, EN61000-4-5
Voltage Reversal ProtectionProtects against V+/V- reversal
Over Current Protection1.1 A (protects against two signals shorted together)
Standards and Certifications
SafetyUL 60950-1
EMIFCC Part 15 Subpart B Class B, EN 55022 Class B
EMSEN 61000-4-2 (ESD) Level 3,
EN 61000-4-3 (RS) Level 2,
EN 61000-4-4 (EFT) Level 2,
EN 61000-4-5 (Surge) Level 2,
EN 61000-4-6 (CS) Level 2,
EN 61000-4-8 (SFMF) Level 1
Green ProductRoHS, CRoHS, WEEE
MTBF (mean time between failures)
Time780,480 hrs
DatabaseTelcordia (Bellcore), GB
Warranty Period5 years
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