Ci-RF11/12/21/22 Series

S908 RIO Fiber Optic Repeater

Support 1~2 S908 RIO bus, according to S908 RIO Protocol
Support 1~2 Fiber Optic Ports, ST connector ( SC, FC Optional)
Support optical fiber link failure and bus error alarm output and LED indication
Support Dial switch for setting communication rate
Support Redundancy optical fiber ring network, solution cycle time<20ms
Input voltage: 9~36VDC, Dual redundant power input with 1500V high voltage isolation
IP40 protection, Metal case, 35mm DIN-Rail Mounting
Support -40~75℃ wide operating temperature range
Overview Specifications Models Resources

Overview of S908 RIO Fiber Optic Repeater

This series is designed for Fiber Optic Repeater which support 1~2 S908 RIO bus and redundancy fiber optical ring network. The use of glass fiber transmission technology enables a very large transmission range and ensures optimal protection from EMC effects on the transmission path. This series adopts large-scale FPGA design and original technology, which can secures data transmission over EMI resistant fiber at speeds up to 1.544Mbps for S908 RIO bus. 

This series supports single and dual optical daisy network. The dual fiber inputs allow connecting multiple devices in a cascade or "daisy chain" fashion for fiber redundancy. The redundant Ring enables a very high level of transmission reliability. When fiber optic error somewhere, the system will rebuild the network link within 20ms, to guarantee the normal system communication, achieve the function of signal transmission self-healing protection. The system will recovery automatically after the network troubleshooting. This series products adopt Comark own R&D professional network protocol Ci-ring, no need any set, no need root knot, quickly finishing the network function of ring closing and ring opening.

Fiber Optical repeater 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 output will activate. 

Hardware adopts fanless, low power consumption, 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 and traffic control.


Specifications of S908 RIO Fiber Optic Repeater

Serial Port

Interface Type: F-Type coaxial cable interface
Conform to S908 RIO protocol standard
Support S908 RIO bus standard Baud Rates: 1.544Mbps
Signal Delay (electrical interface): 6bit
Without terminal resistor, connect external when necessary

 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:
        A: Transmit wavelength is single mode 1310nm, then Receive wavelength is 1550nm
      B: Transmit wavelength is single mode 1550nm, then Receive wavelength is 1310nm
      The optical line BER: <10-9
    Signal Delay (optical interface): ≤2.3μs/node

Power Supply

DC (9~36V) dual redundant power input, industrial standard voltage DC24V
1500V high voltage isolation and reverse connect protection
5.08mm industrial terminal port
Consumption is less than 4W
      Relay: optical fiber link failure and bus error alarm output
    Contact rating: 1 A  24V DC, Industrial Terminal port
      Dimensions (H×D×W): 136mm×104.8mm×52.8mm
      Weight: 800g
      Casing: IP40 protection, wave grain aluminum reinforce case
    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
        IEC61000-4-2 (ESD): Power ±2KV Contact, ±15KV Air; Relay ±2KV Contact, ±15KV Air; Data Cable ±15KV Air
        IEC61000-4-4 (EFT):Power ±4KV, Data Cable ±4KV
        IEC61000-4-5 (Surge):Power ±2KV CM/ ±1KV DM, Relay±2KV CM/ ±1KV DM
        IEC60068-2-27 (Shock)
        IEC60068-2-32 (Free Fall)
        IEC61000-6-2 (General Industrial Standard)

Models of S908 RIO Fiber Optic Repeater

Available Models


100M Fiber Port

















  Ci-RF11/12/21/22 Series Datasheet 



  Ci-RF11/12/21/22 Series Quick Installation Guide