Chapter 8 Serial Communication Module AH10SCM Click MODBUS Advance , and double click Modbus1 . Select 2 in the SCM COM Port box, select 1 in the Rack box, and select 1 in the Slot box. (4) Downloading parameters Click Download on the toolbar, click a module which will be downloaded, and click OK . If only one module is connected, users can click OK directly. 8-41