RIEVTECH STUDIO SOFTWARE MANUAL The Device Type can be Barcode, RievtechSLAVE and Modbus RTU Server. The Barcode refers to the bar code gun. It can scan information and display it by using a continuous 100 characters saved in the area which LW8900 is the start address. LB8999,which is as a flag bit, is set ON after scanning is finished (it will not be reset automatically). The Rievtech SLAVE device is supported and the HMI can work as a slave or a master device. The Modbus RTU Server is referred to: Detailed manual/Setup/Communication Settings/Local Connection/Provide Service (Slave) . 466