CRS2F Series

Point System™ RS232 Remotely Managed Media Converter Module
RS232 Copper to Fiber

The CRS2F Series stand-alone serial RS232 to fiber converters allow you to extend the distance between serial connections with the use of fiber optic cable. These full-featured stand-alone media converters transmit the full complement of RS232 flow control/handshaking signals optically and supports full or half-duplex asynchronous data transmission at speeds up to 115 Kbps. Link a remote terminal to a host computer: Connect multiple devices, such as security scanners, POS devices, remote terminals and building access/alarming systems to a host computer. Ideal for campus or business environments where remote devices can be networked in a point-to-point configuration where distances are greater than the 15 meter limitation of conventional copper serial cables.

Please note: this product is soon to be retired and replaced by the ION Platform. Limited quantities may still be available, contact our sales team to find out more. For more information, view the Point System vs ION product comparison and cross reference guide.

NDAA Compliant

CRS2F Series Overview


  • Read/write access to remote stand-alone unit
  • Local or Remote Loopback on copper and fiber
  • DTE/DCE switch for easy installation with straight-through cabling
  • Full/Half-duplex asynchronous transmission at speeds up to 115 Kbps
  • Supports the following flow control signaling:
    1. DCD – Data Carrier Detect
    2. RXD – Receive Data
    3. TXD – Transmit Data
    4. DTR – Data Terminal Ready
    5. SG – Signal Ground
    6. DSR – Data Set Ready
    7. RTS – Request To Send
    8. CTS – Clear To Send
  • Field Upgradeable Firmware Management

Management Features

  • Report Converter status to Chassis management software:
    • Local Fiber Link status
    • Local/Remote
    • Hardware/Software mode
    • Local/Remote Loopback
    • Local/Remote DTE/DCE mode
    • Local/Remote link status
  • Write operation includes:
    • Local Loopback
    • Remote Loopback
  • Can be used with any Point System™ Chassis

CRS2F Series Tech Specs


  • EIA/TIA-574
  • EIA/TIA RS-232E

Data Rate

  • 115 Kbps


  • DTE/DCE: Select appropriate position
  • Loopback: Norm = normal operation;
  • Loop = Fiber and copper loopback

Status LEDs

  • P (Power): Lit for normal operation
  • RX: Steady = Copper Link
  • Flashing = Rx Data
  • FL: Steady = Fiber Link
  • Flashing = Loopback mode


  • Width: 0.86” [22 mm]
  • Depth: 5″ [127 mm]
  • Height: 3.4” [86 mm]

Power Consumption

  • 5.0 Watts


  • Environment specs are dependent on the chassis chosen
  • Operating: 0°C to 50°C
  • Storage: -40°C to +85°C
  • Humidity: 5% to 95% (non-condensing)
  • Altitude: 0 – 10,000 ft.


  • 1 lb. [0.45 kg]


  • CISPR22/EN55022 Class A + EN55024, EN60950 Class A
    FCC Class A, CE Mark


  • Lifetime

CRS2F Series Downloads

Additional Product Information

Note: Some Documentation may have Transition Networks named or pictured. Transition Networks was acquired by Lantronix in August 2021. Learn more about the acquisition here.

Lantronix Part # Name Description Order Now
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Lantronix Part #
CRS2F Series

DB-9 [15 m/49 ft.] to 1300nm multimode (ST) [2 km/1.2 mi.] Link Budget: 11.0 dB

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Lantronix Part #
CRS2F Series

DB-9 [15 m/49 ft.] to 1300nm multimode (SC) [2 km/1.2 mi.] Link Budget: 11.0 dB

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Lantronix Part #
CRS2F Series

DB-9 [15 m/49 ft.] to 1310nm single mode (SC)[20 km/12.4 mi.] Link Budget: 16.0 dB

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