Transmit 4 Contact Closures Over a Single Fiber

Product Overview

The RLH 4 Channel Contact Closure fiber link system provides a transmission of up to four independent contact closure signals over one optical fiber. The system comprises two 4 channel cards, a transmitter card and a receiver card.

The transmitter card provides the electrical-to-optical interface between dry contact closure relay input and a fiber strand.

The receiver card is locally powered by a 24-56VDC source and provides LED indicators to display relay conditions, power, and fiber carrier receive.

This fiber link card is designed to be installed into any of the RLH Fiber Link Card Housings, and occupies a single card slot.

View User Guide


Lead Time: 1 to 2 Weeks*

For product questions, volume pricing and/or delivery outside of the US and Canada, please contact sales.


4 Channel Contact Closure

Product configurationCard TypeModeConnectorDistanceFibersPart numberPricehf:att:pa_card-typehf:att:pa_modehf:att:pa_connector
Transmitter Card Multimode STTransmitter CardMultimodeST2km/1.2 milesSingle Fiber4C4-M2STT-02$420.00
Receiver Card Multimode STReceiver CardMultimodeST2km/1.2 milesSingle Fiber4C4-M2STR-02$420.00
Transmitter Card Multimode SCTransmitter CardMultimodeSC2km/1.2 milesSingle Fiber4C4-M2SCT-02$420.00
Receiver Card Multimode SCReceiver CardMultimodeSC2km/1.2 milesSingle Fiber4C4-M2SCR-02$420.00
Transmitter Card Singlemode STTransmitter CardSinglemodeST15km/9 milesSingle Fiber4C4-S3STT-02$520.00
Transmitter Card Singlemode STTransmitter CardSinglemodeST48km/29 milesSingle Fiber4C4-S4STT-02$620.00
Receiver Card Singlemode STReceiver CardSinglemodeST15km/9 miles & 48km/29 milesSingle Fiber4C4-S3STR-02$520.00
Transmitter Card Singlemode SCTransmitter CardSinglemodeSC15km/9 milesSingle Fiber4C4-S3SCT-02$520.00
Transmitter Card Singlemode SCTransmitter CardSinglemodeSC48km/29 milesSingle Fiber4C4-S4SCT-02$620.00
Receiver Card Singlemode SCReceiver CardSinglemodeSC15km/9 miles & 48km/29 milesSingle Fiber4C4-S3SCR-02$590.00
  • A complete system requires one Transmitter and one Receiver

*Lead times are estimates and may vary. You will be contacted within 1 business day to go over the details of your order. If you require a specific date, let us know!
*Days = Business Days

WarningWarning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to