American Fibertek MX-481T-SC - Manual (Page 3)

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INSTALLATION AND OPERATION INSTRUCTIONS
INTRODUCTION
Thank you for purchasing your American Fibertek MX-481T-SC multimode bi-directional drop and
repeat RS485 data transceiver. Please take a few minutes to read these installation instructions in
order to obtain the maximum performance from this product.
FUNCTIONAL DESCRIPTION
The MX-481T-SC operates as one of a group of drop and repeat transceivers for the transmission of
one bi-directional RS485 data channel. This data channel can be configured for 2 wire RS485 or 4 wire
RS485 data.
NOTE: This unit is shipped with the data channel in the RS485 2-wire configuration. For RS485
4-wire configurations, please refer to the DATA CONFIGURATION section for changes to the
default switch settings.
The MX-481T-SC is designed to operate with multiple MX-481T-SC transceivers with bi-directional
RS485 data over two multimode fiber optic cables.
The MX-481T-SC converts a single data signal into a high speed serial data stream. This serial data
stream modulates a laser at 1310 nm wavelength. The MX-481T-SC also detects a serial data stream
signal returning on a separate optical fiber using a 1310 nm wavelength detector. The 481T-SC Series
product is designed to operate over an optical loss budget range of 0 to 10 dB on 62.5 um multimode
fiber. The MX-481T-SC will also operate on 50 um multimode fiber at a reduced loss budget range.
Refer to the product specification sheet for additional performance data.
The RS485 channel may be configured for 2-wire (half duplex) or 4-wire (full duplex) with or without
biasing. Switch selectable 120 ohm terminations are available for RS485 data.
This unit is contained in a rugged aluminum housing with internal dc voltage regulation. The detachable
terminal blocks and LED indicators provide for easy installation and monitoring of data and optical
power.
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 +12VDC power source with a current rating of 1.25 amps for proper operation. The
DC input is diode protected. In the USA and in Canada an American Fibertek PS-12D is supplied with
this unit. The negative side of the power input is directly connected to ground. ANSI/NFPA 70 Class 2
wiring is recommended.
POWER CONNECTION
Power is supplied to the unit via a two pin terminal connector on the right side of the unit. Follow the
label on unit for proper orientation of +12 volt dc and ground.