WEBfactory 2010

BACnet Connector COV lifetime and resubscription

The lifetime of the COV subscription is specified in the COVPeriod in the <Device> section of the XML configuration.

The COV resubscription takes places automatically for all devices with half of the period specified in COVPeriod parameter in each <Device> section of the XML configuration. The unit of COV period is in milliseconds.

Some BACnet devices send values of relevant properties to the BACnet connector while being subscribed to COV and some devices do not send initial values. Therefore the COV1Read parameter in <Device> section of the XML configuration instructs the BACnet connector to read the property values once, even for those properties which are subject to COV subscription.