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VAISALA ________________________________________________________________________ 3 
 
 
Table of Contents 
CHAPTER 1 
GENERAL INFORMATION............................................................................ 7 
About This Manual ................................................................... 7 
Contents of This Manual ....................................................... 7 
Version Information ............................................................... 8 
Related Manuals ................................................................... 8 
General Safety Considerations ............................................. 8 
Feedback............................................................................... 9 
Product Related Safety Precautions ...................................... 9 
ESD Protection ......................................................................... 9 
Recycling ................................................................................10 
Trademarks ............................................................................. 10 
License Agreement ................................................................ 10 
Warranty.................................................................................. 10 
CHAPTER 2 
PRODUCT OVERVIEW................................................................................ 11 
Introduction to SPS311.......................................................... 11 
Sounding Subsystem with MRP111............................... 12 
Sounding Subsystem with MRP121 and MPU121 ........ 12 
Front Panel..............................................................................13 
General................................................................................ 13 
Power Control Switch..........................................................13 
Indicator LEDs..................................................................... 13 
Power Control Dip Switches................................................ 14 
Chassis and Plug-In Units..................................................... 16 
Unit slots.............................................................................. 16 
Plug-in Units with MRP111 Configuration...................... 16 
Plug-in Units with MRP121 and MPU121 Configuration 18 
Motherboard........................................................................ 19 
I/O Extension Board ............................................................ 19 
Connector Panel.....................................................................19 
AC-Line ............................................................................... 21 
DC In (24 V) ........................................................................ 21 
UHF Antenna ...................................................................... 21 
GPS Antenna ...................................................................... 21 
VLF Antenna ....................................................................... 21 
LAN1 ................................................................................... 22 
CTRL................................................................................... 22 
CHAPTER 3 
INSTALLATION............................................................................................ 23 
General .................................................................................... 23