American Fibertek RTM-1485-2F8 User Manual
© Copyright 2006, American Fibertek, Inc. 1220JD
With Bi-directional RS485 Data
Instruction Manual
RTM-1485-2F8
Video Transmitter
Table of Contents
Functional Description ........................................................................3
Installation...........................................................................................3
Power Source .....................................................................................3
Power Connection...............................................................................3
Fiber Input / Output Connections........................................................4
Video Input Connection .......................................................................4
RS485 Four Wire Input / Output Connections.....................................4
RS485 Two Wire Input / Output Connections.....................................5
Data Configuration..............................................................................5
Switch/Jumper Settings.......................................................................6
RTM-1485-2F8 Status LED Indicators................................................7
RS-485 Termination and Offset Bias Requirements...........................7
Warranty and Service Information ......................................................8
INSTALLATION AND OPERATION INSTRUCTIONS
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INTRODUCTION
Thank you for purchasing your American Fibertek RTM-1485-2F8 multimode video transmitter
with RS485 transceiver. Please take a few minutes to read these installation instructions in
order to obtain the maximum performance from this product.
FUNCTIONAL DESCRIPTION
The RTM-1485-2F8 operates as half of a transmitter / receiver pair for the transmission of
baseband NTSC, PAL, RS170, or RS343 video signals and bi-directional RS485 data. It is
designed to operate with the MRM-1485-2F8 or RRM-1485-2F8 video receiver with RS485
transceiver over two multimode fibers.
The RTM-1485-2F8 converts a single video input along with a single RS485 input into a FM
modulated optical fiber output using an 850 nm wavelength source. The RTM-1485-2F8 also
converts an optical RS485 signal returning on the same fiber into an electronic RS485 output
using an 850 nm wavelength detector. This unit may be configured for two wire half duplex or
four wire full duplex electrical interfaces. The M1485-2F8 Series product is designed to operate
over an optical loss budget range of 0 to 12 dB. The RTM-1485-2F8 operates on 50 um or 62.5
um multimode fiber. Refer to the data sheets for detailed performance specifications.
This unit is designed for rack mounting in any of the three American Fibertek subracks
available. The subrack model numbers are SR-20/1, SR-20R/1, and SR-20/2. Slide in rack
mounting and LED indicators provide for easy installation and monitoring of video, data, and
power.
The RTM-1485-2F8 is designed for rack mounting only. For a modular stand alone version
please see the MTM-1485-2F8.
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.
The unit slides into any open slot in the SR-20 subrack. Use a small screwdriver to push and
lock the two ¼ turn fasteners into place.
POWER SOURCE
Power to the unit is supplied by the subrack. Please refer to the SR-20 and PSR instructions for
further details.
POWER CONNECTION
Power is supplied to the unit via a four finger backplane connector. The RTM-1485-2F8 can be
inserted into the subrack or removed from the subrack with power applied to the backplane.
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