American Fibertek RTM-1485 User Manual

Instruction Manual
RTM-1485
Video Transmitter
With Bi-directional RS485 Data
© Copyright 2005, American Fibertek, Inc. 0209JD
INSTALLATION AND OPERATION INSTRUCTIONS
INTRODUCTION
Thank you for purchasing your American Fibertek RTM-1485 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 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 or RRM-1485 video receiver with RS485 transceiver over a single multimode fiber optic cable.
The RTM-1485 converts a single video input along with a single RS485 input into a FM modulated optical fiber output using a 1300 nm wavelength source. The RTM-1485 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 Series product is designed to operate over an optical loss budget range of 0 to 12 dB. The RTM-1485 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 and power.
The RTM-1485 is designed for rack mounting only. For a modular stand alone version please see the MTM-1485.
INSTALLATION
THE INSTALLATION OF THIS UNIT SHOULD BE MADE BY A QUALIFIED SERVICE PERSON(S) AND MUST CONFORM TO ALL 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 can be inserted into the subrack or removed from the subrack with power applied to the backplane.
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FIBER CONNECTION
The fiber optic connection is made via a ST connector located on the back of the unit. Be sure to allow sufficient room for the required minimum bend radius of the fiber cable used.
VIDEO INPUT CONNECTION
The video input connection is made via a BNC connector on the back of the unit. The
video input should be connected to an appropriate 75 baseband video source such as
a camera or a video recorder output. For optimum performance the video cables should be the shortest length of coax practical.
RS485 FOUR WIRE INPUT / OUTPUT DATA CONNECTIONS
Data input/output connections are made via a terminal block on the back of the unit. An example of the RS485 interconnection between the RTM-1485 unit and the copper device to which it is attached is shown below. This illustration is based on industry standard EIA terminology for the transmission of electronic data signals. Using this terminology, the driver of an electronic signal is labeled TX or data out. Correspondingly, the receiver of an electronic signal is labeled RX or data in. Not all manufactures follow standard EIA terminology. Consult the installation instructions for your copper device if you are unsure which two wires are the drive (data out) wires and which two wires are the receive (data in) wires.
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