Transport 2 Active Channels of Serial Data Over Fiber

Product Overview

The RLH Serial Data DIN Fiber Link system transports two active channels of copper serial data over fiber optic cable, allowing for both RS-232 and RS-485/422 to be used at the same time. Fiber optics not only provide long distance communication up to 74 mi. (120km), but also provide immunity to EM/RFI and transient surges. This is ideal for extending serial data communications over long distances, or near large electrical equipment where resistance to EMI is desired.

A comprehensive set of LED’s on the front panel indicate power status, fiber status, RS-232 and RS-485/422 activity. Powering options include our standard 24-48VDC, or high range DC powering of 125VDC. This rugged system also features redundant power inputs with a system alarm contact, and comes standard with DIN clip and wall mount ears.

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.


Serial Data RS-232 & RS-485/422

Product configurationModeConnectorDistanceFibersPart numberPricehf:att:pa_modehf:att:pa_connectorhf:att:pa_distance
Multimode, SC, 2km/1.2 miles, Dual FiberMultimodeSC2km/1.2 milesDual FiberSDD-03-2$330.00
Multimode, ST, 2km/1.25 miles, Dual FiberMultimodeST2km/1.2 milesDual FiberSDD-04-2$330.00
Singlemode, SC, 20km/12.4 miles, Dual FiberSinglemodeSC20km/12.4 milesDual FiberSDD-40-2$430.00
Singlemode, SC, 60km/37 miles, Dual FiberSinglemodeSC60km/37 milesDual FiberSDD-41-2$530.00
Singlemode, SC, 120km/74 miles, Dual FiberSinglemodeSC120km/74 milesDual FiberSDD-45-2$610.00
Singlemode, ST, 20km/12.4 miles, Dual FiberSinglemodeST20km/12.4 milesDual FiberSDD-50-2$430.00
Singlemode, ST, 60km/37 miles, Dual FiberSinglemodeST60km/37 milesDual FiberSDD-51-2$530.00
Singlemode, ST, 120km/74 miles, Dual FiberSinglemodeST120km/74 milesDual FiberSDD-55-2$610.00
Singlemode, SC, 20km/12.4 miles, Single Fiber - Side ASinglemodeSC20km/12.4 milesSingle Fiber - Side ASDD-10-2$470.00
Singlemode, SC, 20km/12.4 miles, Single Fiber - Side BSinglemodeSC20km/12.4 milesSingle Fiber - Side BSDD-11-2$470.00
Singlemode, SC, 60km/37 miles, Single Fiber - Side ASinglemodeSC60km/37 milesSingle Fiber - Side ASDD-14-2$570.00
Singlemode, SC, 60km/37 miles, Single Fiber - Side BSinglemodeSC60km/37 milesSingle Fiber - Side BSDD-15-2$570.00
  • For the 125VDC input power option, please note your part number, add -A to the end, and get your quote here
  • Bi-Directional single fiber models require an A side and B side unit for a complete system

*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