Advantech BB-FOSTCDR

Serial to Fibre Optic Converter

  • Data Rates up to 115.2 kbps
  • 2.5 Mile (4 km) Range
  • 10 to 30 VDC Input Voltage
  • Wide Operating Temperature
  • 2000V Isolation
  • MODBUS ASCII/RTU Compatible
  • EMI/RFI Protection


The BB-FOSTCDR is our Industrial Serial to Multimode Fibre Optic Converter. Designed for industry, it extends serial data range up to 2.5 miles and provides the most versatile connection possible between any asynchronous full or half-duplex serial equipment. In addition to direct point-to-point connectivity, it is capable operating in a multi-drop mode. This allows one serial device to communicate with up to 31 others around a fibre optic ring. Since it supports mixed serial standards, you can replace other converters and isolators and add the EMI/RFI immunity inherent to fibre optic communications.

In RS-232 mode, the BB-FOSTCDR 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 special software.

Easy to install and configure, it has an 8 position DIP Switch to set up the RS-422/485 parameters and terminal blocks to connect serial signals and power.

Part Number Serial Connector Fibre Connector Isolation
BB-FOSTCDR Terminal Block Multi-mode ST 2,000 V
Serial Technology
Data Rate RS-232: 115.2 Kbps maximum
RS-422/485: 460.8 Kbps maximum
Connector Terminal block (24 to 14 AWG)
RS-232 TD, RD, GND
Connector Terminal block (24 to 14 AWG)
RS-485, 2-wire Data A(-), Data B(+), GND
RS-422/485, 4-wire TDA(-), TDB(+), RDA(-), RDB(+), GND
Rating 2KV RMS, 1 minute
Lines Protected 2-way (input, output lines)
Method Optical
Fibre Optic Technology
Type / Wavelength Multi-mode / 820 nm
Output Power (-) 17 to (-) 10 dBm
Receive Sensitivity (-) 25.4 dBm to (-) 24 dBm
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 30 VDS
Consumption 1.7 Watts
Connector Terminal block, (24 to 14 AWG)
Industrial Bus
LED Indicators Serial TD, RD, and Power
Dimensions 10.6 x 7.9 x 2.5 cm (4.3 x 2.3 x 0.95 in)
Enclosure 35mm DIN mount, plastic
Weight 182 g (0.4 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
Approvals / Certifications
cULus Recognized, File Number: E222870
FCC Part 15, CISPR, EN 55022: 2010 + AC:2011 Class A 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
FOSTCDR 460854 hours
Calculation Method MIL 217F Parts Count Reliability Prediction

If you have any questions or would like any further information, please send us a message.

Your Name (required)

Your Company (required)

Your Email (required)

Phone (required)

Your Message