Ci-SF110/SF120 series

RS-232/422/485 to Fiber Optic Converter

Support RS-232/485/422 Ports
Support 1~2 Fiber Optic Ports, ST connector ( SC, FC Optional)
Supports single and dual optical Daisy-Chain
Support Optical Fiber link failure and power error alarm LED indication
Input voltage: 18~36VDC, Dual redundant power input with 1500V high voltage isolation
IP40 protection, Metal case, 35mm DIN-Rail Mounting
Support -40~75°C wide operating temperature range
Overview Specifications Models Resources

Overview of RS-232/422/485 to Fiber Optic Converter

Ci-SF110/SF120 series provides a fiber converter solution to extend RS-232 or RS-422/RS-485 transmission distance up to 2KM over Multi-mode fiber and 20KM over Single-mode fiber . The converter is equipped with multiple interface circuits, for connection to RS-232, RS-422, or RS-422/485/ (2 or 4 wire). This series secures data transmission over EMI resistant fiber at speeds up to 115.2Kbps for RS-232 or up to 2Mbps for RS-485/422. 

Ci-SF110/120 series is designed for industrial grade serial to fiber converter which supports transparent transmission through the RS232/RS422/RS485 serial interface. The dual fiber inputs allow connecting multiple devices in a cascade or Daisy-chain topology for fiber redundancy. 

Additionally, Ci-SF110/120 series converter provides a fiber link monitoring function to detect the communication errors on both sides of the fiber connection. When a communication error occurs, a red LED status indicator will turn on and the alarm relay contact on the terminal block will activate.

Hardware adopts DIN rail mounting, IP40 metal case, wide temperature and voltage design and has passed rigorous industrial standard tests, which can suit for the industrial scene environment with harsh requirements for EMC. It can be widely used in various situations like industrial control, process control, traffic control and intelligent residential district, and particularly applicable to bank, electricity, departments and systems that have special requirements relating to electromagnetic interference environment.


Specifications of RS-232/422/485 to Fiber Optic Converter

Serial Port

RS-232 3 wires (TX, RX, GND), baudrate: 0~115.2Kbps

RS-422 support RX-, RX +, TX-, TX + full-duplex mode
RS-485 support  A, B half-duplex mode
RS-485/422 baudrate: 0~2Mbps

Fiber Port

Wave length: multi-mode 850nm/1310 nm;  single mode 1310 nm/1550nm
Fiber type: multi-mode 50/125um, 62.5/125um, 100/140um
              Single mode 8.3/125 um, 9/125um, 10/125um
              Transmission distance: multi-mode 2km, single mode 20km
              Fiber interface type: ST/SC/FC (optional); ST (standard configuration)
              Single Fiber wavelength: 1310nm/1550nm

Power Supply

DC (18~36V) dual redundant power input (can be customized with 9~18VDC)
Industrial standard voltage DC 24V, consumption is less than 1.5W
      DC 1500V voltage isolation and reverse connect protection
          5.08mm industrial terminal port


 Relay: Fiber link fault alarm
 Contact rating: 1A @24V DC, Industrial Terminal port


 Dimensions (H×D×W): 136mm×104.8mm×52.8mm
 Weight: 800g
       Casing: IP40 protection, wave grain aluminum reinforce case option
           Installation: Wall mounting or DIN rail mounting


Operating Temperature:-40℃~75℃(-40℃~85℃ optional)
Storage Temperature: -40℃~85℃
          Ambient Relative Humidity: 5%~95%(non-condensing)


5 years

Models of RS-232/422/485 to Fiber Optic Converter

Available Models

100M Fiber Port

Fiber Mode / Distance



Multi-Mode / 2KM



Multi-Mode / 2KM



Single mode / 20KM



Single mode / 20KM





 Ci-SF110_120 Series Datasheet



 Ci-SF110_120 Series Quick Installation Guide

V2.0.1 2019-05-21