Read and Write Properties

The Read Property service allows you to view any properties contained in any BACnet object contained in BACnet devices on a BACnet network. In addition, individual BACnet devices can choose to accept or reject Read and Write Property requests on a per-object and per-property basis.

The Write Property service allows you to change or modify setpoints and other values in a BACnet device. However, you may not be able to modify object properties in some BACnet devices.

The BACnet Object Browser allows you to modify or edit most object properties for every type of BACnet object with the exception of properties that are only status information, such as acked-transitions, event time stamps, status-flags. For example, for a Notification Class Object, you can modify the description, object-name, priority, and recipient-list property types, but not the object-identifier.

The Write Property button on the toolbar is enabled for property types that you can edit. The Write Property function on the Services menu is grayed out if editing the object property is not allowed. In addition, the BACnet device may deny the request by the device in which the object resides. If so, the error displays in the bottom pane of the browser. Many other errors are also displayed in message boxes.

If the out-of-service property is F, the present values of input type objects— that is, Analog Input, Binary Input—cannot be commanded by the browser.