Modbus is a serial master/slave protocol. Modbus can run over any serial type media (copper, fiber, wireless, modem, etc..)
Modbus Plus is a peer-to-peer protocol which runs at 1 mbs. The Modbus Plus protocol specifies the software layer as well as the hardware layer. Proprietary cabling and terminators must be used with a Modbus Plus network.
ModbusTCP/IP is an EtherNet based protocol. ProSoft Technology's ModbusTCP/IP products act in a master/slave capability.
Article ID: 127
Created On: Tue, Nov 28, 2006 at 11:02 AM
Last Updated On: Fri, Jan 18, 2008 at 12:00 AM
Authored by: Technical Support
Online URL: https://www.prosoft-technology.com/kb/article.php?id=127