Implement HART communication with DAC8760
HART is defined by the HART Communication Foundation as a bi-directional communication protocol that provides data access between intelligent field instruments and host systems. It was developed in the mid 1980's and has been increasingly adopted in process control instrumentations systems. Frequency shift keying (FSK) is used to communicate at 1200 bit/s with 1.2kHz and 2.2kHz used to represent binary 1 and binary 0 values, respectively. The FSK signal is superimposed over a 4-mA to 20-mA analogue signal.
The DAC8760 can be configured in three different ways for HART communication; (1) CAP2 configuration, (2) HART-IN configuration, and (3) ISET-R configuration. For all three configurations, the DC level of the DAC current is unaffected by the modulating HART signal.
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Originally published by Texas Instruments Inc. at www.ti.com as "Implementing HART Communication with the DAC8760 Family".