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Table of Contents 

 

 
Functional Description ........................................................................ 3 
 
Installation .......................................................................................... 3 
 
Power Source ..................................................................................... 3 
 
Power Connection .............................................................................. 3 
 
Input / Output Connections................................................................. 4 
 
Data Configuration ............................................................................. 4 
 
Switch/Jumper Settings ...................................................................... 5 
 
MRM-1485 Status LED Indicators ...................................................... 6 
 
RS-485 Termination and Offset Bias Requirements .......................... 7 
 
Warranty ............................................................................................. 8 
 
Service Information ............................................................................ 8 
     
 

 
 
 
 
 
 
 
 
 
 
 

Summary of Contents for MRM-1485

Page 1: ... Copyright 2003 American Fibertek Inc 0731JD Instruction Manual MRM 1485 Video Receiver With Bi directional RS485 ...

Page 2: ...on 3 Installation 3 Power Source 3 Power Connection 3 Input Output Connections 4 Data Configuration 4 Switch Jumper Settings 5 MRM 1485 Status LED Indicators 6 RS 485 Termination and Offset Bias Requirements 7 Warranty 8 Service Information 8 ...

Page 3: ...er 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 block and LED indicators provide for easy installation and monitoring of video data and dc power The MRM 1485 is designed for mounting as a modular stand alone unit For a rack mounted version please see the RRM 148...

Page 4: ... from the factory in the RS485 4 wire configuration In order to configure the unit for RS485 two wire operation the unit needs to be opened up and several switch settings and jumper pins need to be modified using the internal switch jumper settings shown on the next page The MRM 1485 is shipped from the factory with internal data input and output 120 ohm terminations switched on In order to remove...

Page 5: ...5 ...

Page 6: ...e RS485 input data from the electrical interface through the MRM 1485 and out onto the fiber The intensity of this indicator will vary with input data patterns however in typical applications it will cycle on and off as data is transmitted RS485 status associated with this LED is summarized below DATA TX LED RS485 Status Red Data Flow Present Off Data Flow Not Detected DATA RX A red LED indicator ...

Page 7: ...s at the furthest electrical devices at the ends of the wire pair For instance if several RS485 devices are connected in a daisy chain fashion the wire connection would loop across all devices in a chain The furthest two points in the chain would need to be terminated A termination resistor for RS485 input data can be selected in the MRM 1485 using switch 1 A termination resistor for RS485 output ...

Page 8: ...R THE FOREGOING WARRANTY THERE IS NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE EXPRESSED OR IMPLIED WHICH EXTENDS BEYOND THE WARRANTY SET FORTH IN THIS AGREEMENT In any event American Fibertek will not be responsible or liable for contingent consequential or incidental damages No agreement or understanding expressed or implied except as set forth in this warranty...

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