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Values sent from a Xenta 121 FC/HP via SNVT bindings are not making it to the receiving controller

Issue

Values sent from a Xenta 121 FC/HP controller via SNVT bindings are not making it to the receiving controller. Viewing the outbound SNVT on the Xenta 121 shows a value, but the inbound SNVT on the receiving controller is invalid or a default value.

Product Line

TAC Vista

Environment

  •  Vista
  • NL220
  • LonMaker
  • ZBuilder

Cause

The Node Configuration parameters are set with a send heartbeat of 0 seconds, which tells the controller to never send an update on the output SNVT.  All Xenta 121 controllers come with a default send heartbeat of 0 seconds, so for them to function in an LNS network where they must send data to another controller, the send heartbeat must be set to something greater than 0 seconds.

Resolution

In order to adjust the send or receive heartbeat of a Xenta 121 controller, follow these steps:

  1. Right click on the controller and go to PlugIns > TAC ZBuilder Plug-In.
  2. In ZBuilder, click on the Configuration tab and go to LON > Node. Here the Send heartbeat and Receive heartbeat can be changed.

The following nvo values will require the Send heartbeat be set to a value greater than zero in order to communicate with another controller using a SNVT binding.

nvoSpaceTemp
nvoUnitStatus
nvoHeatPrimary
nvoHeatSecondary
nvoCoolPrimary
nvoEffectOccup
nvoTerminalLoad
nvoEffectSetpt
nvoFanSpeed
nvoEnergyHoldOff
nvoOccSensor
nvoRawDOStatus

 

The following nvi values will default to invalid if they do not receive an update within a specified period of time. For most applications this should be left at zero. If the application must actively poll a SNVT then the receive heartbeat can be set to a value greater than zero.

nviApplicMode
nviSetPtOffset
nviEnergyHoldOff
nviFanProof
nviOccSensor
nviSpaceRH
nviOutdoorRH
nviSpaceIAQ
nviOutdoorTemp
nviSourceTemp
nviAuxHeatEnable
nviSourceFlow
nviComprEnable

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