Digital Communication Modes & Network Configurations in the HART Protocol

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The HART digital communication signal has a response time of approximately 2‐3 data updates per second without interrupting the analog signal. A minimum loop impedance of 230 Ω is required for communication though 250 Ω is typically used in practice. HART communication occurs in two modes:
(a) Request – Response Mode
(b) Burst Mode

Request-Response Mode
During normal operation (2‐3 data updates per second), each field device (slave) communication is initiated by a host (master) communication device. Two hosts can connect to each HART loop. The primary host is generally a distributed control system (DCS), programmable logic controller (PLC), or a personal computer (PC). The secondary host can be a handheld terminal or another PC. Field devices include transmitters, actuators and controllers that respond to commands from the primary or secondary host.

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