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6 – TopKAT Master/Satellite
Description
The TopKAT master/satellite option allows up to eight TopKAT units to be linked together
through a half-duplex RS-485 data loop, with one acting as the master controlling unit. The
master is the only unit that will need to have a data communication link; it will collect all
transactions and maintain the complete data base for the entire site. The data communication
ports of the satellite units are disabled. The individual TopKAT units may use the standard
RS-485 loop (9800 pumps) to communicate to their pumps or the mechanical interface. The
interface must be the same for each pump within an individual TopKAT. However, both types
of pump interface may be combined within a master/satellite configuration.
There are four possible configurations for the master/satellite:
• All electronic, where the TopKAT can control up to 8 electronic 9800/ASTRAs and up to
• All mechanical, where the master TopKAT controls up to 2 mechanical hoses and up to 14
• Combination, where the master TopKAT controls 2 electronic 9800/ASTRAs and up to 14
• Mechanical pumps, where the master TopKAT can control up to 8 mechanical pumps (4
MDE-4319A TopKAT Fuel Managment System Installation Manual · November 2005
7 satellite readers
other hoses (2 hoses per up to 7 TopKATs)
mechanical hoses (2 per up to 7 TopKATs)
hoses per Mechanical PCU, up to 2 Mechanical PCUs) and up to 7 satellite readers.
TopKAT Master/Satellite
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