Industrial Serial to Fibre Optic Converter

  • Data rates up to 115.2 kbps
  • 10 – 48 VDC input power range
  • Wide operating temperature
  • 2,000V, 3-way optical isolation
  • Modbus ASCII/RTU compatible
  • EMI / RFI protection
  • UL Class 1/Division 2
  • TD, RD and Power LED’s


Model FOSTCDRI is Advantech B B SmartWorx’ premium industrial serial to multi-mode fibre optic converter. Its rugged design is UL approved and certified for Class 1/Division 2 industrial environments. It extends data communications up to 4km (2.5 miles) . It provides three-way optical isolation on the input, output and power lines. In addition to direct point-to-point connectivity, it is capable of operating in a multi-drop mode. This allows one serial device to communicate with up to 31 other devices around a fibre ring. Since it supports mixed standards, you can replace other converters and isolators and add the EMI / RFI protection inherent to fibre optic communications. In RS-232 mode, the converter supports Transmit and Receive data. Handshaking signals are not passed through. An Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for external software. Easy to install and configure, it has a 12-position DIP switch on the bottom to configure RS-422/485 parameters. Serial data and power cables connect to removable terminal blocks. ST connectors are used for the fibre.

Part Number Serial Connector Fibre Connector Isolation
BB-FOSTCDRI Terminal Block Multi-mode ST 2,000 V
Serial Technology
Data Rate 9.6 to 115.2 kbps
Connector Removable terminal block
RS-232 TD, RD, GND
Connector 5-position, removable terminal block
RS-485, 2-wire Data A(-), Data B(+), GND
RS-422/485, 4-wire TDA(-), TDB(+), RDA(-), RDB(+), GND
Bias Built-in, switchable, 1.2KΩ
Termination Built-in, switchable, 120Ω
Rating 2KV RMS, 1 minute
Surge Protection 600 W peak power dissipation
Clamping Time < 1 pico-second
Lines Protected 2-way (input, output lines)
Method Optical
Fibre Optic Technology
Type / Wavelength Multi-mode / 820 nm
Output Power -16dBm min, -12dBm typical, -9dBm maximum
Receive Sensitivity -24dBm min, -25.4dBm maximum
Cable 62.5/125 micro-meter
Connector ST
Data Rate 9.6 to 115.2 kbps
Maximum Distance 4 km (2.5 mi)
Idle Stage Transmitter light ON
Source External
Input Voltage 10 to 48 VDC (56 VDC maximum)
Consumption 0.5 W (typical), 1.3W (with termination)
Connector 2-position, removable terminal block, 24 to 14 AWG
Terminal Blocks
Wire Size Accepted 28 to 12 AWG
Pitch 5.08 mm
Insulation Resistance ≥ 500 MΩ @ 500 VDC
Maximum Torque 5 Kg / cm
LED Indicators
Power Red LED
FO Receive Red LED
FO Transmit Red LED
Dimensions 12.3 x 11.3 x 3.2 cm (4.9 x 4.5 x 1.3 in)
Enclosure IP 20 plastic, 35 mm DIN mount
Weight 199.6 g (0.44 lbs)
Operating Temperature -40 to +80 °C (-40 to +176 °F)
Storage Temperature -40 to +85 °C (-40 to +185 °F)
Operating Humidity 0 to 95% non-condensing
MTBF 138904 hours
MTBF Calculator Method Parts Count Reliability Prediction
Approvals / Certifications
UL Class 1 Division 2, Groups A, B, C, D
File Number: E222870 (HAZLOC E245458)
FCC Part 15, CISPR, EN 55022: 2010 + AC:2011 Class B Emissions
EN 61000-6-1: 2007 Generic Standards for Residential, Commercial and Light Industrial Environments
EN 61000-4-2: 2009 Electro-Static Discharge (ESD)
EN 61000-4-3: 2006 +A1 +A2 +IS1 Radiated Field Immunity (RFI)
EN 61000-4-4: 2012 Electrical Fast Transients-Burst Immunity (EFT)
EN 61000-4-6: 2009 Conducted Immunity

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