MODBUS APPLICATION PROTOCOL SPECIFICATION V1
MODBUS is an application layer messaging protocol, positioned at level 7 of the OSI model, which provides client/server communication between devices connected on different types of buses or networks.
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Modicon Modbus Protocol Reference Guide
modbus.orgDOK-3Modicon Modbus Protocol Reference Guide PI–MBUS–300 Rev. J June 1996 MODICON, Inc., Industrial Automation Systems One High Street North Andover, Massachusetts 01845
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