This document specifies the HART C8PSK Physical Layer and provides information necessary to construct and use C8PSK compatible devices and networks.
This Specification is devised to:
1. To guarantee interoperability between HART FSK and C8PSK devices;
2. Define C8PSK signaling requirements; and
3. Specify the data coding, scrambling and equalization requirements for the C8PSK Physical Layer.
C8PSK communications (if supported) must meet all requirements specified in this document. Furthermore, several sections of this specification incorporate requirements found in the corresponding (i.e., same numbered) section of the FSK Physical Layer Specification. Whenever this occurs, conformance with the requirements, included by reference, from the FSK Physical Layer Specification is mandatory.
The C8PSK Physical Layer is designed to be backward compatible with both current loop and FSK signaling and, as a result builds on the requirements found in the FSK Physical Layer Specification. Conformance to all requirements found in the FSK Physical Layer Specification is a prerequisite to conforming to this specification. Furthermore, all C8PSK implementations must automatically detect and demodulate either FSK or C8PSK communications.
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