API RP 552:2025

API RP 552 PDF

This document describes methods used to transmit process measurement and control commands as well as diagnostic information between field devices and control systems.

The communication technologies included in this document are as follows.

• Electronic signals that communicate values on an analog or discrete circuit.
• Transmission of values using pneumatic signals.
• Serial data transmission over wire, fiber optic cable, or wireless media.
• Industry fieldbus systems that supply communications among devices using digital communications.
• Measurements using wireless communication to control systems or data acquisition systems.