ARServerLearning Center
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Protocol learning path

Understand the protocols before mapping relay data.

This learning center explains the relationship between IEC 61850, Modbus TCP, MQTT, and ARServer. It is written for engineers who need practical understanding before connecting a relay, building a register map, or publishing data to a broker.

Information center

Protocol learning for ARServer users

ARServer sits between a relay or IED and the systems that need readable values. The source side is IEC 61850 MMS. The classic control output is Modbus TCP. The modern data output is MQTT.

Simple mental model: IEC 61850 describes and reads the relay model. ARServer selects and validates useful points. Modbus TCP and MQTT expose those selected points to tools that are easier to integrate.

Recommended path

  1. Learn IEC 61850 terminology: IED, logical node, data object, data attribute, function constraint, quality, timestamp, and SCL.
  2. Learn Modbus TCP register thinking: address ranges, polling clients, coils, discrete inputs, input registers, and holding registers.
  3. Learn MQTT publishing: broker, topic, payload, retain behavior, quality context, and timestamp context.
  4. Use ARServer Quick Start to add a relay or SCL file, select signals, validate readings, map outputs, and run the gateway.
IEC 61850 basicsStart here if relay object names such as XCBR, PTOC, MMXU, stVal, and q are still unclear. Modbus TCP basicsUnderstand how HMI and SCADA clients poll registers and status points. MQTT basicsLearn broker-based publishing for dashboards, middleware, and historian workflows. ARServer Quick StartMove from learning to a working relay IP or SCL based gateway setup.