Do you ever look at a Modbus hex string and wonder what it really means?Are you trying to check if your PLC or SCADA system is sending the right values?Or do you just need to quickly create a Modbus command to test a device? This Free Online Modbus Decoder and Encoder is built to make those tasks easy.… Read More »
In the world of industrial automation and SCADA systems, the DNP3 protocol (Distributed Network Protocol 3) plays a critical role in enabling secure and reliable data communication between devices. Whether you’re a utility engineer, cybersecurity analyst, or automation developer, decoding DNP3 frames is essential for troubleshooting, compliance, and interoperability. Manually decoding DNP3 hexadecimal data is time-consuming and error-prone.… Read More »
The IEC 60870-5-104 protocol (usually called IEC-104) is one of the main communication standards used in SCADA and substation automation. It defines how control centers, RTUs, and gateways exchange data over TCP/IP networks. If you work with substations, automation, protocol testing, or energy systems, you’ve probably seen IEC-104 hex frames. Reading these frames by hand is slow and… Read More »
GOOSE (Generic Object Oriented Substation Event) is one of the most important communication services defined in IEC 61850. It is used to exchange fast, event-driven messages between protection IEDs, bay controllers, and automation devices. GOOSE is designed to carry protection signals such as trips, interlocks, blockings, permissives, and alarms with very low latency and high reliability, replacing copper… Read More »
Data Sets are one of the most important concepts in IEC 61850. They define which values inside an IED are grouped together so the device can report them, log them, publish them over GOOSE, or return them in a single MMS read request. Anyone working with protection relays, SCADA integration, automation logic, or commissioning eventually deals with Data… Read More »
IEC 61850 is the modern communication standard used in power utility automation systems. It defines how intelligent electronic devices (IEDs) communicate inside substations and across modern electrical networks. One of the most important technologies inside this standard is MMS (Manufacturing Message Specification). MMS is used for supervisory communication, real-time monitoring, remote control, reporting, configuration, file exchange, and system… Read More »
When people first hear about IEC 61850, they often assume it is simply another communication protocol like DNP3, Modbus, or IEC 60870-5-104. But this assumption is incorrect. IEC 61850 is not just a protocol—it is a full engineering language designed to describe, model, and structure the functions that make up modern digital substations and power automation systems. Where… Read More »
DNP3-IP, designed for distribution SCADA and remote telemetry, and IEC 61850, built for advanced substation automation and high-speed protection schemes, represent two fundamentally different communication approaches in modern power systems. Modern electric power systems depend on digital communication networks that connect substations, field devices, control centers, and automation systems. Two of the most important communication standards in this… Read More »
Looking for a quick, hassle-free way to decode IEC 101 frames? This free IEC 101 Decoder runs entirely in your browser and turns raw hex into clear, readable text instantly. No installs, no setup, no extra tools. Just paste your data and get answers. It also handles originator addresses and can automatically tell whether your frame uses a… Read More »
Every Modbus TCP/IP device listens on TCP port 502. This single port carries all Modbus communication over Ethernet — read requests, write commands, exception responses, and diagnostics. Port 502 is registered with IANA (Internet Assigned Numbers Authority) under the service name “mbap” (Modbus Application Protocol). It has been the standard since the Modbus TCP specification was published in… Read More »