This document is the NARI-RELAYS RCS-943A Microcomputer Protection Communication Specification, which introduces the communication protocol of the product, including communication speed, communication address, protocol type, remote modification of parameters, etc., as well as communication layer settings, protection value communication instructions, fault event report instructions, self-test report instructions, and fault report instructions.
This document details the communication protocol options supported by the RCS‑943A micro‑protection device, including the 1E080870‑5‑103 and LFP protocols. It explains how to configure communication addresses, baud rates, and protocol types via the device parameter menu.
The specification also defines the structure of protection setting messages, fault event reports, self‑test reports, analog measurement encoding, and digital protection signals, providing the exact byte layouts and field definitions required for integration with supervisory systems. This manual is written in Chinese.
| Serial frame format | 1 start bit, 8 data bits, no parity, 1 stop bit |
|---|---|
| Analog value encoding | 2 bytes per value, 16‑bit unsigned, 2 fixed decimal places |
It supports the 1E080870‑5‑103 protocol and the LFP protocol, selectable in the device parameters.
The communication address is set in the device parameter menu and cannot be modified remotely.
A fault event report consists of 9 bytes: year, month, day, hour, minute, second, millisecond L, millisecond H, and fault action information.
Each analog measurement occupies two bytes.