Comnet RS232/422 DB25 Repeater/1310/1550 Nm/RTS/CTS Timer/sm/1 fiber

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  • Data Format RS-232, RS-422
  • Data Rate DC-115 kbps
  • Operating Mode Asynchronous, simplex or full duplex
  • Bit Error Rate <1 in 10-9 @ Max. Optical Loss Budget
  • Anti-Streaming Time-out 4, 8, 16, 64 Seconds or Infinity (disabled)


  • FDX55M2, FDX55M2E 1310 nm, Multimode
  • FDX55M28 850 nm, Multimode
  • FDX55S1, FDX55S1(A,B)E 1310/1550 nm, Single Mode
  • FDX55S2, FDX55S2E 310/1550 nm, Single Mode


  • FDX55M28, FDX55M2, FDX55S2 2 In/2 Out
  • FDX55M2E 2
  • FDX55S1 1 In/1 Out
  • FDX55S1(A,B)E 1

Optical Emitter: Laser

LED Indicators

  • › Transmit Data
  • Receive Data
  • Clear to Send (CTS)
  • Request to Send (RTS)
  • Fault/Anti-Streaming Activated


  • Optical ST standard (SC, FC as options only)
  • Power Terminal Block
  • Data Type DB-25S
  • Expansion Port RJ-11


  • Operating Voltage Range 9 to 30 VDC (or from C1 Rack, consult factory)
  • Power Consumption 2.5 W

Battery Backup Option

  • Internal, rechargeable Nickel Metal Hydride (NIMH) battery.
  • Operating Period: 12 hours typical

Electrical & Mechanical

  • Surface Mount 9-30 VDC @ 2.5 W
  • Rack From Rack
  • Number of Rack Slots 2
  • Current Protection Automatic Resettable Solid-State Current Limiters
  • Circuit Board Meets IPC Standard
  • Size (in./cm) (L×W×H) 6.1 × 5.3 × 2.2 in (15.5 × 13.2 × 5.6 cm)
  • Shipping Weight <2 lbs./0.9 kg


  • MTBF: >100,000 hours
  • Operating Temp: -40° to +75° C
  • Storage Temp: -40° to +85° C
  • Relative Humidity: 0% to 95% (non-condensing)

This listing is for FDX55S1 Repeater only. Use description below as a general reference.

The ComNet FDX55 series consists of fully-digital transceiver units designed for implementing simplex or full-duplex RS232 Drop-and-Repeat poll-and-respond traffic signalization/communications data networks utilizing one or two optical fibers. These environmentally-hardened units are ideal for use in unconditioned out-of-plant or roadside installations and the master-configured transceiver unit may be located anywhere within the network, making this equipment ideal for applications involving on-street master controllers with upstream and downstream communication requirements. These units are compatible with FDX50, FDX51 and FDX52 Series of optical modems. Manually resettable anti-streaming is included for unparalleled network protection. Optional battery backup capability provides the highest level of network reliability in the event of a loss of local prime operating power, and maintains continuous communications channel operation. Plug-and-play design ensures ease of installation and no electrical or optical adjustments are ever required. Bi-color (Red/Green) LED indicators are provided for rapidly ascertaining equipment operating status. These units are interchangeable between stand-alone or card mount configurations.

Note: The power supplies provided with ComNet products are designed for benign 0 to 50º C applications. Hardened power supplies are available, consult the factory to select the right power supply for your application.


  • Meets EIA RS232C/D specifications (Simplex or Duplex)
  • NTCIP compatible
  • Tested and certified by an independent laboratory for full compliance with the environmental requirements (ambient operating temperature, mechanical shock, vibration, humidity with condensation, high-line/low-line voltage conditions and transient voltage protection) of NEMA TS-1/ TS-2 and the Caltrans Specification for Traffic Signal Control Equipment.
  • Robust design assures extremely high reliability in unconditioned roadside environments
  • User-selectable DTE or DCE interface ensures ease of installation and maximum versatility
  • Supports Request to Send (RTS) and Clear to Send (CTS) signals
  • RJ-11 expansion port provides network branching capability by electrically linking co-located transceiver units
  • Voltage transient protection on all power and signal input/ output lines provides protection from power surges and other voltage transient events.
  • Optional internal battery backup provides 12 hours operating time in the event of loss of 115 VAC prime operating power, and maintains continuous channel communications.
  • Wide optical dynamic range: optical attenuators are never required
  • User-configurable optical and electrical Anti-Streaming provides network protection against faulty streaming controller operation
  • Indicating LEDs display equipment operating status
  • Hot-swappable rack modules
  • Interchangeable between stand-alone or rack mount use – ComFit
  • May be DIN-rail mounted by the addition of ComNet model DINBKT1 or DINBKT4 adaptor plate.
  • Lifetime Warranty

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