Serial RS-485, RS-422, RS-232 to Fiber Media Converters

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Description Features Drawings Model Selection Specification Documents Support

Thor Fiber now has a line of Multi-Serial (RS-232 / RS-485/ RS-422) to Fiber Optic Converters that transmit a serial protocol over fiber. Fiber Transmission extends a serial signal up to 120km.

These units support single-mode and multimode over a single fiber. The serial port interface is a single terminal block connector field wiring.

These units automatically detect the signal baud rate of the connected serial device that ranges from 300bps to 115.2Kbps baud. It also automatically adjusts to changes in the connected device’s bound during operation without reconfiguration or interruption of service.

It supports Chassis, Wall-mounted, and DIN rail mount for quick and easy installation.

  • Point-Point Bi-Directional Transmission
  • Zero-Delay automatic forwarding
  • RS-232/ RS-485 / RS-422 to fiber automatic baud rate detection
  • Baud rate :300bps to 115.2Kbps
  • Protocol Asynchronous Serial
  • Supports multi-mode, single-mode and single-fiber with FC/ST/SC connectors
  • 20Km (40 80 or 120Km if needed )  Multi-mode up to 3000 feet
  • Hot-pluggable
  •  Chassis avaialble, Wall-mounted or DIN-Rail installation
  • supports 1500W surge protection and 15KV ESD protection
  • External power supply
  • Wide Range Operating Temperature Supports: -40 to 70°C
  • Supports Input Voltage 9 ~ 48VDC
  • Supports Reverse Polarity Protection

EMI, RFI and Transient Surge Immunity

Electromagnetic interference (EMI) is a common phenomenon in typical environments like industrial plants, warehouses and factory floors. This interference can cause corruption of data over serial or copper-based Ethernet links. Data transmitted over fiber optic cable however is completely immune to this type of noise, thus preventing the negative effects of voltage equalization currents and electromagnetic interference on the data cables. A Serial to Fiber Media Converter therefore enables you to inter-connect your serial devices over fiber ensuring optimal data transmission, increased availability of the system, and improved network design.

Model Selection

Simplex fiber solution


(A unit) RS485/422 /232 over 1 fiber (1310nm) over 1 fiber transceiver fiber SC/PC connector
(B unit) RS485/422/232 over 1 fiber (1550nm) over 1 fiber transceiver SC/PC fiber connector


XX - Optical Distance - 20,40,80,120Km  (20Km c, works also over multimode fiber up to 3000feet)

YY- Optical connector Type ST, FC, SC - (SC is a default)



Physical interface

The industry standard - Copper Terminal Block

Interface Signal 


Baud Rate

300bps ~ 125kbps

300bps ~ 900kbps  (F-RSD-A-B-TX/RX -H) Special order

Code Bit Rate

0-1Mbps Typically


< 10 -9


Asynchronous Serial

Mode Point to point Bi-directional full duplex


Fiber Connector

SC as default, ST/PC FC/SC optional

Optical distance

20Km (40,80,120km -model dependent )

Fiber type

Single-mode, Dual fiber (single fiber input/output available)

LED Indicators


RS-232 signal


4-wire RS485 Signal

T+, T-, R+, R-, GND

2-wire RS485 Signal

D+, D-, GND

RS-422 signal

T+, T-, R+, R-, GND

Interface protection

1500W surge protection and 15KV ESD protection

Environmental temperature

-30 to +75C

Relative humidity

0-95% ( no condensation)

RoHS Compliant


Power supply voltage

AC 85-220V

Power  Consumption


Power Input


                                                                       Dimensions : 4"x5"x1.25"


User's Manual is avalible only for logged users.
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