All product specifications are subject to change without notice.

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Industrial Serial to

Fiber Optic Converters

Models FOSTCDRI, FOSTCDRI-INV

Model FOSTCDRI is Advantech B+B SmartWorx’ premium industrial serial to

multi-mode fiber optic converter. Its rugged design is UL approved and certified

for Class 1/Division 2 industrial environments. It extends data communications

up to 4 km (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 fiber ring. Since it supports mixed standards, you can

replace other converters and isolators and add the EMI / RFI protection inherent

to fiber 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 fiber.

Model FOSTCDRI-INV features an “inverted fiber state” and is suitable for

applications requiring the fiber optic transmit light to be Off in the idle state.

• 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

• Inverted fiber state option (Model FOSTCDRI-INV)

• TD, RD and Power LEDs

PRODUCT FEATURES

ACCESSORIES

MDR-40-24 - 24 VDC, 1A, slim-line DIN rail power supply

DFMM-STST-1M - Multi-mode fiber optic cable with ST/ST connectors (62.5/125 micro-

meter), 1 meter

TBKT1 - Replacement 2-position terminal block, 5.08 mm

TBKT2 - Replacement 5-position terminal block, 5.08 mm

ORDERING INFORMATION

MODEL NUMBER

SERIAL

CONNECTOR

FIBER CONNECTOR

ISOLATION

FOSTCDRI

Terminal Block

Multi-mode ST

2,000 V

FOSTCDRI-INV

Terminal Block

Multi-mode ST

2,000 V

What is the difference between Model FOSTCDRI

and Model FOSTCDRI-INV?

The FOSTCDRI keeps the light in the fiber turned On when no data is

transmitted and the input signal is in the MARK state (idle). If light is lost

or too low, the electrical signals go to the SPACE state. The input signal

turns the light Off/On in step with the data. This model has an indicator for

Transmit and Receive, if no light is received, the RD LED will come on,

the RD output will be positive relative to GND (normally negative), and in

RS-422 or RS-485 mode, no light will set the TD(A)- line high relative to

TD(B)+. The usual voltage with light in the fiber and no signal sets the B

line high relative to A (about 4.4 Volts DC no termination).

The FOSTCDRI-INV is the opposite. The fiber is Off in the idle state.

FOSTCDRI, FOSTCDRI-INV_0218ds