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PowerScout HD
RTU Programming & Scripting
BACnet
Building Automation and Control Network (BACnet) protocol was developed under the auspices of the
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and is recognized as
an American National, European, and ISO global standard.
BACnet Device ID: All device IDs on a BACnet network must be unique. Refer to the section “Serial
Protocols” and refer to the Register List for additional information
Serial
The PSHD Serial version supports writable max_master, MS/TP address, max_info_frames properties in
the device object for MS/TP networks. For best network performance, the max_master should be set to
the highest MS/TP MAC address on the network. The MS/TP address (object 1069) must be unique on
the MS/TP network. The max_info_frames does not need to be changed in most installations.
Ethernet
Ethernet versions can register as Foreign Devices to a BBMD. BBMD stands for BACnet/IP Broadcast
Management Device. The BBMD IP address can be set from ViewPoint HD or through character string
object 2264. A value of 0.0.0.0 disables foreign device registration. This process requires a processor
soft reset.
BACNET SEGMENTATION
The PSHD meter does not support BACnet Segmentation. Segmentation is required when the requested
data is longer than the underlying data packet size limitations of the protocol, i.e., the Maximum
Transmission Unit (MTU). The MTU for BACnet MS/TP is 480 bytes and for BACnet/IP it is 1476
bytes. This means that some objects with large data arrays will not fit within a packet. This limitation
effectively means that some BACnet client software cannot read the Structured View Object List. In this
case the BACnet client structured view mode may need to be disabled and the standard flat object view
will need to be used instead, particularly with BACnet MS/TP.
BACNET STRUCTURED VIEW
The PSHD meter supports the Structured View (SV) object container. If this option is supported in the
BACnet exploring tool, objects will be grouped logically into elements which can be named to reflect
electrical or physical locations, followed by system objects, as shown below for a PS12 having elements
A-D.
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