User manual VAISALA GML20 DATASHEET

[. . . ] www. vaisala. com GML20 and GML20T LonWorks® Options for GMD/W20 Series GML20 (left) and GML20T modules enable digital communication between the Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GM20 and a LonWorks® network. [. . . ] The nodes communicate with each other, sending messages containing the value of the desired variables. With Vaisala modules, these variables are CO2 (GML20) or CO2 and temperature (GML20T). Some network variables are so-called configuration variables, which are used to define the behavior of the node. With the GML20 and GML20T, they are used to designate how much the temperature and/or carbon dioxide level must change before a measured value is sent again. Features/Benefits Enables digital communication between Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GM20 and LonWorks® GML20 for CO2 signal GML20T for CO2 + T signal Savings in cabling, installation and maintenance costs Intelligent LonTalk® protocol In a LonWorks® network, devices called nodes communicate with each other using the LonTalk ® protocol. Every node consists of a Neuron® GML20, GML20T CARBON DIOXIDE Technical Data Technical data Features Features ®interoperable · LonWorks · LonWorks® interoperable · Twistedpairfreetopology, networktypeTP/FT-10at78kbps · Twisted pair free topology, network type TP/FT-10 at 78kbps Additionaltwowiresneededforpoweringthetransmitter;can · · Additional two wires needed for powering thusbeconnectedtobothpoweredandnon-powerednetworks the transmitter; can thus be connected to · both powered and non-powered networks ServicebuttonandserviceLEDforsimpleinstallationand · Service button and service LED for simple installation and configuration · configuration Externalinterface(. xif)fileavailableonrequest(GML20 · External interface (. xif) file available on request (GML20 partno. 19412GM, GML20Tpartno. 19748GM) part no. 19748GM) · Temperature (GML20T only): · Temperature(GML20Tonly):Measurementaccuracy 0. 5°C(0. 9°F)Measurementrange0. . . +45°C(+32. . . 113°F) Measurement accuracy 0. 5 °C (0. 9 °F) Warm-uptime30min. Measurement range 0. . . +45 °C (+32. . . 113 °F) Warm-up time 30 min. (Both models GML20 and GML20T) nviRequest:torequestmodesforobjectswithinthisnode nvoStatus:toreportstatusofobjectsonthisnode nviRequest: to request modes for objects within this node nvoCO2ppm: thisoutputvariablereportstheCO2leveldetectedby nvoStatus: to report status of objects on this node thesensor nciMaxSendtime: indicatesthemaximumperiodoftimethat nvoCO2ppm: this output variable reports the CO2 level detected by expiresbeforethesensorobjectautomaticallyupdatesallits the sensor outputvariables(defaultvalue:300seconds) nciMinSendtime: indicatestheminimumperiodbetweenoutput nciMaxSendtime: indicates the maximum period of time that expires networkvariabletransitions(defaultvalue:5seconds) before the sensor object automatically updates all its output variables (default2MinDelta:indicatestheminimumCO2levelchange nciCO value: 300 seconds) requiredtoupdatetheoutputnetworkvariables nciMinSendtime: indicates the minimum period between output (defaultvalue:10ppm) network variable transitions (default value: 5 seconds) nciCO2MinDelta: indicates the minimum CO2 level change required (Gml20t model only) to update the output network variables nvoHVACtemp: thisoutputvariablereportsthetemperature (default value: 10 ppm) detectedbythesensor Networks Variables for Temperature nciMaxStime_temp: indicatesthemaximumperiodoftimethat (GML20T model only) expiresbeforethesensorobjectautomaticallyupdatesallits outputvariables(defaultvalue:300seconds) nvoHVACtemp: this output variable reports the temperature nciMinStime_temp: detected by the sensor indicatestheminimumperiodbetween outputnetworkvariabletransitions(defaultvalue:5seconds) nciMaxStime_temp: indicatestheminimumtemperaturechange nciMinDelta_temp: indicates the maximum period of time that expires before the sensor object automatically updates all its output requiredtoupdatetheoutputnetworkvariables variables (default value: 300 seconds) (defaultvalue:0. 3°C) nciTmpOffset:indicatesthetemperatureoffsetlevel nciMinStime_temp: indicates the minimum period between output (defaultvalue:-0. 8°C) network variable transitions (default value: 5 seconds) nciMinDelta_temp: indicates the minimum temperature change required to update the output network variables (default value: 0. 3 °C) nciTmpOffset: indicates the temperature offset level (default value: -0. 8 °C) For more information, visit www. vaisala. com or contact us at sales@vaisala. com Ref. [. . . ] © Vaisala Oyj Vaisala Instruments Catalog 2005 Ref. [. . . ]