6 ConfigurationThe information in this chapter refers to the configuration of the AD-MM 400 withthe Configuration Software AD-Studio via the configuration interface.6.1 Operating modesThe AD-MM 400 can be either a Modbus master (default setting) or a Modbus slave.The operating mode can be changed under ’Device functions’ in the ConfigurationSoftware AD-Studio .6.1.1 AD-MM 400 as Modbus MasterIn this operating mode, the AD-MM 400 automatically reads the value for each displayline of a display from the holding register of a slave. The display lines are configuredindependently of the display and can be freely assigned to one or more displays. Values??of different slaves can thus be combined and displayed on a display. The pictureshows the basic arrangement.AD-MM 400AD-LU 30 GT AD-LU 30 GT AD-LU 30 GTSlave 1 Slave 2 Slave 3MasterRS-485, Modbus-RTUMaster, z.B. SPSRS-485, Modbus-RTUFigure 6.1: AD-MM 400 as Modbus-Master14