Official information-HART protocol based Bell202 standard frequency shift keying FSK signal at low frequencies 4-20mA analog signal amplitude is 0.5mA superimposed on the two-way audio digital signal digital communication, data transfer rate of 1.2kbps.

HART官方资料\Block Data Transfer Specification Spec190.pdf
............\C8PSK Physical Layer Specification Spec060.pdf
............\Command Summary Specification Spec099.pdf
............\Common Practice Command Specification Spec151.pdf
............\Common Tables Specification Spec183.pdf
............\Data Link Layer Specification Spec081.pdf
............\Device Families Command Specification spec160.pdf
............\FSK Physical Layer Specification Spec054.pdf
............\HART field communications protocol specification.Rev6.0.pdf
............\Lit-18.pdf
............\PID Control Device Family Specification spec160.7.pdf
............\Spec151 (1).pdf
............\Temperature Device Family Specification SPEC-160.4.pdf
............\Universal Command Specification Spec127.pdf
HART官方资料

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