Transcription of Modicon Modbus Protocol Reference Guide
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Modicon Modbus Protocol Reference Guide
1 ModiconModbus ProtocolReference GuidePI MBUS 300 Rev. JDOK-3 ModiconModbus ProtocolReference GuidePI MBUS 300 Rev. JJune 1996 Modicon , Inc., Industrial Automation SystemsOne High StreetNorth Andover, Massachusetts 01845PI-MBUS 300 PrefaceiiiPrefaceThis Guide is written for the person who will use Modicon Modbus protocols andmessages for communication in Modicon programmable controller describes how messages are constructed, and how transactions take placeusing Modbus Guide should be used in conjunction with Modicon user guides for the typesof networks and programmable controllers present in the application.
4 Modbus Protocol PI–MBUS–300 Introducing Modbus Protocol (Continued) Transactions on Modbus Networks Standard Modbus ports on Modicon controllers use an RS–232C compatible serial interface that defines connector pinouts, cabling, signal levels, transmission baud rates, and parity checking. Controllers can be networked directly or via modems.
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