Manual MW-XF - Omni Instruments

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MW User’s ManualExemysFigure 46 – GRD Modbus in the list of valid GRDsOnce both GRDs are incorporated to the list we can assign the corresponding slaves to eachone and also indicate in which variation of Modbus protocol will be used on the GRD’s serialport.6.3.2 SlavesTo be able to add slaves to each GRD we must access the Slave – Modbus Serial screen, thenwe position the mouse over the GRD in the top part and press button “+Slave”, a windowappears like the one shown below where we enter the slave number connected to the GRD inits port.Figure 47 – Window to add slaves to a GRDOnce the corresponding slaves have been entered we must select which variation of Modbusprotocol will be used on the GRD’s serial port (Modbus RTU or Modbus ASCII)www.exemys.com Rev 2.1.0 - Junio 2009 36
MW User’s ManualExemysFigure 48 –Modbus RTU Slaves added to a GRDAs we can see in the previous figure the GRD 10 has 2 Modbus slaves that talk Modbus RTU.Finally configure the Timeout and then we press the “Save” button for changes to be stored.The purpose of the Timeout is to keep the system from waiting for a response for an determinedtime, this time is expressed in milliseconds, therefore, when a query is sent it is the maximumwaiting time for a response, once this time is due the system discards all responses comingfrom that GRD until a new query is received.Verify that the timeout of the Modbus master is higher than the configured Timeoutfor the GRD to avoid missing responses to the queries.Modbus slaves for the following GRD are added the same way, but different from the previouscase, this one has a Modbus ASCII communication protocol.www.exemys.com Rev 2.1.0 - Junio 2009 37
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