American Fibertek MR-81 User Manual

© Copyright 2008, American Fibertek, Inc. 0609JD

Contact Closure Receiver

Instruction Manual

MR-81

Eight Channel

INSTALLATION AND OPERATION INSTRUCTIONS

INTRODUCTION

Thank you for purchasing your American Fibertek MR-81 singlemode contact closure receiver. Please
take a few minutes to read these installation instructions in order to obtain the maximum performance
from this product.

FUNCTIONAL DESCRIPTION

The MR-81 operates as half of a transmitter/receiver pair for the transmission of eight dry latching
contact closure signals. It is designed to operate with the MT-81 or RT-81 contact closure transmitter
over one multimode fiber optic cable. The MR-81 has a user selectable switch that allows the contact
status sent by the MT-81 or RT-81 to be maintained unchanged through loss of optical or electrical
power at the receiver. Both the transmitter and receiver include a recessed button to clear all contacts
to a default state.

The MR-81 converts an optical input into eight contact closure outputs using a 1310 nm wavelength
detector. The 81 Series product is designed to operate over an optical loss budget range of 0 to 12 dB.
The MR-81 operates on 62.5 um multimode fiber. Refer to the data sheets for detailed performance
specifications.

This unit is contained in a compact and rugged aluminum housing with internal dc voltage regulation.
The detachable terminal blocks and LED indicators provide for easy installation and monitoring of
contact closure and power.

The MR-81 is designed for mounting as a modular stand alone unit. For a rack mounted version please
see the RR-81.

INSTALLATION

THIS INSTALLATION SHOULD BE MADE BY A QUALIFIED SERVICE PERSON AND SHOULD
CONFORM TO THE NATIONAL ELECTRICAL CODE, ANSI/NFPA 70 AND LOCAL CODES.

Mount the unit to a secure surface using #8 (3mm) hardware in four places. See the drawing on the
next page for mounting dimensions. Be sure to allow sufficient room for the required minimum bend
radius of the fiber cable used.

POWER SOURCE

THIS PRODUCT SHALL BE POWERED BY A LISTED CLASS 2 POWER SUPPLY ONLY.
This unit requires a 12 volt DC power source for proper operation. In the USA and in Canada an
American Fibertek PS-12D is supplied with this unit. ANSI/NFPA 70 Class 2 wiring is recommended.

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