BACnet error message when trying to use WriteProperty to a BACnet device

Issue

Seeing error message "An attempt has been made to write to a property defined as inaccessible through the BACnet protocol write service"

Product Line

Andover Continuum, SmartStruxure Solution

Environment

BACnet integration

Cause

Seeing error message "An attempt has been made to write to a property defined as inaccessible through the BACnet protocol write service" when trying to manually command or writeproperty to a bacnet object on a third party device.

Resolution

The error message is very clear and describes the problem. The property that is being commanded or written to, is not available to be written to in the third party device.

Many properties and object classes can not be written to on BACnet devices, this is often defined in the PIC's statement for the product.


Some BACnet devices allow writing to be enabled/ disabled, but this must be set up on the third party device depending on the site requirements.

An example of this is in the Hawk/ Jace units where there is a regular BACnet user that has no write capabilities from third party devices, so to allow this you have to tick a box for "Super user".