Section 2Expansion Board DescriptionDescription 2-1IntroductionThe Modbus Plus expansion board is a Group 2 expansion board. Itallows a Series H control to communicate as a node on the ModbusPlus network. It has a DB9 connector to make connection to the networksimple.Group 2 boardModbus Plus Expansion BoardCatalog No. EXB015A01A good resource document is the “Modicon Plus Network Planning andInstallation Guide”. Refer to that guide for planning your network anddetails such as cable specifications etc.