Installation & Operation Manual - Model AVT4000
Contents of this Manual are Subject to Change Without Notification Page 23
SECTION 7 – OPTIONAL BACNET MS/TP
BACnet® is a standard data communication protocol designed specifically for building
automation and control networks. The Accutrol AVT4000 Transmitter uses the BACnet MS/TP
(Master-Slave/Token Passing) protocol which is a type of MAC layer implemented using the EIA-
485 signaling standard. The performance of the MS/TP network is heavily influenced by the
network traffic load, the assignment of MS/TP node addresses and the network configuration
parameter Nmax_info_frames. Additionally, it is imperative the physical network layer is
properly configured (cabling, EOL terminations, bias, etc...) and is verified to be reliable
otherwise the network performance can be compromised.
7.1 BACnet Objects
The Accutrol AVT4000
Transmitter product family supports a collection of BACnet-visible
objects which are defined in the following table.
Notes:
1. Writing a value of (1) to the BACnet Object BV1 will cause the transmitter to copy the
active configuration stored in volatile memory (RAM) and write that value to
nonvolatile memory (FLASH). Reference Section 7.1.1 for a detailed description.
2. Nonvolatile Flash memory has a limited number of Lifetime Write Cycles, therefore
the AVT4000 has an internal limit of 10,000 flash writes to protect the
microcontroller from damage. BACnet point AI2 is provided so the number of
remaining flash writes available can be monitored over the BACnet.
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