Manual MW-XF - Omni Instruments

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MW User’s ManualExemys6 MW with GRDs in Modbus mode6.1 IntroductionThis chapter explains how to configure the MW accept connections from GRDs using Modbuson there serial ports.In the Modbus mode it is possible to use the serial port of the equipment to communicate withdevices connected to it by means of the Modbus protocol but always respecting the operationaltopology.6.2 TopologyThe following figure shows the topology that should be used for the system to work correctly.Figure 44 – Modbus TopologyThe basic idea is based on a Modbus master that wants to collect data from multiple slaves, inthis case a SCADA was taken as a model.On the other side, the slaves are connected to the GRD, each slave has a Modbus ID numberthat identifies it in the network.The SCADA must be connected to the MW to be able to make queries to all slave devices andthe GRD are the link between the slaves and the MW.The same way, more GRDs with other slaves connected in its RS232 or RS485 serial port canbe added.The queries begin at SCADA, pass through the MW and are derived to the corresponding GRDthat has the corresponding slave connected in its serial port, the response starts at the slave,passes through the MW by means of the GRD to arrive finally to the Modbus master6.3 ConfigurationThe configuration is made based on a real example and we configure the different parametersstep by step.www.exemys.com Rev 2.1.0 - Junio 2009 34
MW User’s ManualExemysLet’s take the following example:We have 2 Modbus (RTU) devices connected in port RS485 of the GRD with GRD ID = 10without a password.Device 1: Modbus ID 43Device 2: Modbus ID 66We also have one Modbus device (ASCII) in port RS232 of GRD with GRD ID = 13 withoutpassword.Device 1: Modbus ID 87MW dataIP/URL: 190.189.165.15Modbus port: 502GRD port: 350006.3.1 GRDWe go to the GRDs Configuration screen and press “New GRD”. This enables the options tocomplete the GRD data.Figure 45 – Adding a GRD ModbusWhen pressing the button it is stored in the list of valid GRDs. Set the “Mode of Serial Port” in“MODBUS”In the following figure we can visualize the addition of another GRD and in the top part the GRDpreviously added.www.exemys.com Rev 2.1.0 - Junio 2009 35
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Manual MW-XF - Omni Instruments

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