Eaton URTDII Instruction Leaflet

4.0 COMMUNICATIONS4.1 Fiber Optic SettingsA set of dip switches (S1) is located on the side of themodule. Dipswitch 10 is used to select the data outputformat of the fiber optic port. Many products in the fieldtoday are connected to the existing URTD module. Thismodule supports 11 RTDs providing only one Auxiliary RTDto the user. To minimize the effort of replacing an exist-ing module with a URTDII module, dipswitch 11 selects alegacy mode that provides data in the same format as theexisting URTD module. Expanded mode adds the 2nd AuxRTD, case temperature and hottest RTDs from each groupof RTDs. Table 5 shows the selection of this switch:Table 5, Dips Switch SettingsDipsw10 ModeOFF 11 RTDs (Legacy Mode)ON 12 RTDs, Case, Hottest (Expanded)4.2 Modbus4.2.1 General Modus DescriptionThe URTDII can also be used as a stand-alone devicethat communicates on a Modbus network. A bidirectionalRS485 port is provided on the bottom of the unit. The fol-lowing describes the configuration of the Modbus param-eters.4.2.2 AddressingA set of dip switches (S1) is located on the side of themodule. These switches set the Modbus address/configu-ration. Dipswitches 1 to 8 represent the binary address ofthe URTDII. Dipswitch 1 is the most significant address bitand dipswitch 8 in the least significant bit. Table 6 showsan abbreviated example of the addressing. Valid addressesrange from 1 to 254. See notes below about reservedaddresses.Address 00otee:N is a broadcast address and should notbe used in a typical Modbus system. If this addressis selected it will put the URTDII module in a modeprovided exclusively for IMR systems. Please refer toIMR Documentation for further information.Address 255otee:N is a reserved address. Normal Modbuscommands will not be interpreted correctly while theunit is set to this address. In this mode the URTDIIshould not be connected to a network because thenetwork protocol is not being handled. The URTDIIwill respond to any message it received with a mini-mum of a prompt character potentially disrupting anyother communications on the network.Address Dipsw0 Dipsw1 Dipsw2 Dipsw3 Dipsw4 Dipsw5 Dipsw6 Dipsw7 Dipsw80 OFF OFF OFF OFF OFF OFF OFF OFF OFF1 OFF OFF OFF OFF OFF OFF OFF OFF ON2 OFF OFF OFF OFF OFF OFF OFF ON OFF...254 ON ON ON ON ON ON ON ON OFF255 ON ON ON ON ON ON ON ON ONTable 6, Modbus Address Selection Settings8IL02602013E Universal Resistance TemperatureNovember 2010 Detector (RTD) Module IIIL02602013E - November 2010 - www.eaton.com

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