How is HART used?
HART has two communication channels. The first is the 4-20mA current loop that users are familiar with and understand. The second is a digital, bidirectional communication channel that is transmitted on the same wires simultaneously without interfering with the 4-20mA signal.

What are the advantages when using HART?
Many control systems today have direct HART capable I/O and support use of the data at all levels. There are many products available which support and simplify integration. Interface components are available that can evaluate all information (analogue and digital) of the HART device. There are also multiplexers that can be integrated into all commonly used DCS systems. Furthermore, there are gateways available that can convert HART information into Ethernet, Modbus or Profibus formats or other protocols.

What is a DD (Device Description)?
It is a software that enables device developers to specify all parameters and capabilities of a field device.

What purpose does the HART device check have?
It serves to check whether the interoperability as well as the HART specifications have been adhered to. All registered devices are posted on the HCF website. All manufacturers receive a certificate of registration and the permission to use the HART Registered mark.

Further information: www.hartcomm.org