• TCF-142 Series - RS485 to Fibre Converters

TCF-142 Series - RS485 to Fibre Converters

Part No. Various
  • Ring and point-to-point transmission
  • Protects against electrical interference and chemical corrosion
  • Automatic Baud Rate Detection
  • Low Current
  • Wide Temperature Range
  • Single Mode and Multi Mode Fibre Compatible

Product Details

The Protec fibre converters are used to convert the RS485 signalling used when networking equipment, to optical fibre signals. Two variants of the interface are available, one that is compatible with multimode optical fibre and one that is compatible with single mode fibre. The correct unit must be specified for the fibre being used in a particular installation.

The units automatically detect the Baud rate being used on the system, meaning that, in general, no setup is required.

The interface is compatible with Protec 6500 fire alarm control equipment and also Cirrus HYBRID, Cirrus CCD, Pro Point Plus and Cirrus RDP range of devices.

Order Codes
TCF-142-M-ST – Multi-mode ST Connector
TCF-142-S-ST – Single-mode ST Connector

Serial Signals

RS-485-4wTx+, Tx-, Rx+, Rx-, GND

Power Parameters

No. of Power Inputs1
Input Current15mA @ 24 VDC
Input Voltage12 to 48 VDC
Overload Current ProtectionSupported
Power ConnectorTerminal block
Power Consumption15mA @ 24 VDC


Physical Characteristics

IP RatingIP30
Dimensions (with ears)(W)90 x (H)100 x (D)22 mm
Dimensions (without ears)(W)67 x (H)100 x (D)22 mm
InstallationWall mounting


Environmental Limits

Operating Temperature-40 to 75°C (-40 to 167°F)
Storage Temperature-40 to 85°C (-40 to 185°F)
Ambient Relative Humidity5 to 95% (non-condensing)


Serial Interface

Optical Fibre

TCF-142-M-ST Series: 100BaseFX ports (multi-mode ST connector)
TCF-142-S-ST Series: 100BaseFX ports (single-mode ST connector)
Low-Speed Fibre ModuleMulti-ModeSingle-Mode
Fibre Cable Requirements50/125 μm, 800 MHzG.652
62.5/125 μm, 500 MHz
Typical Distance5 Km40 Km
WavelengthTypical (nm)8501310
TX Range (nm)840 to 8601290 to 1330
RX Range (nm)800 to 9001100 to 1650


TX Range (dBm)0 to -50 to -5
RX Range (dBm)0 to -200 to -25
Link Budget (dB)1520
Dispersion Penalty (dB)11
Note: When using a power meter to measure the fibre TX power, set the baudrate to 9,600 bps and send data (00, …, 0h) to the serial converter’s serial port.
Pull High/Low Resistor for RS-485150 kΩ (¼W ± 5%)
Terminator for RS-485120Ω (¼W ± 5%)

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