#Modbus
35 articles tagged with #Modbus. This page is set to noindex per SEO configuration.
Modbus to MQTT: How the Gateway Bridge Works
Modbus to MQTT explained: how a gateway maps registers to topics, builds JSON payloads, and handles reads, writes, QoS and TLS. With a worked example.
Modbus Parity and Character Format
Modbus parity and character format: data bits, parity, and stop bits for RTU and ASCII, the even-parity default, the two-stop-bit rule, and what parity misses.
Modbus Unit Identifier Explained: Unit ID by Scenario
Modbus Unit Identifier (Unit ID) explained by scenario: direct TCP devices, RTU gateways, multi-port gateways. Value ranges, common defaults, troubleshooting.
Modbus Broadcast Function Codes: Address 0 Explained
Modbus broadcast on address 0: which function codes support it, how serial and TCP differ, turnaround timing, gateway behavior, and when to actually use it.
Modbus Client-Server vs Master-Slave Terminology
Modbus client-server vs master-slave: the 2020 terminology change explained. What stays the same, translation table, and how to read mixed-terminology docs.
Modbus TCP MBAP Header Explained: 7 Bytes Byte by Byte
Modbus TCP MBAP header decoded byte by byte: Transaction ID, Protocol ID, Length, and Unit ID, with a real hex dump, network byte order, and common mistakes.
Modbus TCP Security Explained: TLS on Port 802
Modbus TCP Security explained: TLS on port 802, X.509 certificates, role-based access control, deployment alongside port 502, cipher suites, real setup.
Modbus Byte Order and Word Order: Fix Your 32-Bit Values
Modbus byte order and word order decoded: ABCD, CDAB, BADC, and DCBA. Fix reversed floats and byte-swapped longs, with a five-minute test and vendor defaults.
Modbus Exception Codes Explained: Complete Reference
Modbus exception codes 01 through 0B in full: Illegal Function, Illegal Data Address, Slave Device Failure, and gateway errors, each with the fix that works.
Top 10 Free Modbus Simulators
Top 10 free Modbus simulators for RTU and TCP testing — slave and master tools with setup steps, command-line examples, and download links.
Modbus Poll Android App: Read, Write, and Test Modbus Devices From Your Phone
Turn your Android phone into a Modbus master. Connect over Wi-Fi, read registers, write coils, and debug PLCs on-site - no laptop needed.
Modbus Register Map Explained: How to Read Any Device
Modbus register map reading made reliable: the four register types, the zero-based offset trap, data types inside registers, byte order, and scale factors.
SCADA Protocol Analyzer: Decode Industrial Protocols on Your Phone
Decode DNP3, Modbus TCP/RTU, IEC-104, and IEC-101 hex frames on your Android phone. Paste, decode, and analyze SCADA protocol traffic anywhere - no laptop needed.
Modbus Function Codes Explained with Real Examples
Modbus function codes with real hex frames: FC 01 to 06, FC 15 and 16, FC 23 and 43, plus register type matching and the mistakes that cause exceptions.
Modbus Security Risks and How to Protect Your Network
Modbus security risks in practice: why the protocol has no authentication, real attack techniques on RTU and TCP, plus segmentation, firewalls, and monitoring.
How to Configure Modbus RTU Over RS-485: Step-by-Step
Modbus RTU over RS-485 configured step by step: bus wiring and topology, termination and biasing, addressing, register types, and T1.5 and T3.5 timing.
Modbus TCP/IP Setup: Step-by-Step Configuration Guide
Modbus TCP/IP setup from scratch: IP planning, server and client configuration, MBAP header basics, gateway bridging to RTU, and connection troubleshooting.
OPC UA vs MQTT vs Modbus: Which Protocol Should You Use?
OPC UA vs MQTT vs Modbus: Which protocol fits your project? Compare security, speed, data modeling, and scalability to pick the right one for your IIoT system.
Coding Modbus TCP/IP for Arduino: A Complete Technical Guide
Complete guide to coding Modbus TCP/IP on Arduino. Learn protocol structure, implement client/server, practical examples, troubleshooting. Perfect for industrial automation projects.
PROFIBUS vs Modbus: Complete Technical Comparison for Engineers
A thorough technical comparison of PROFIBUS vs Modbus — covering protocol architecture, message framing, function codes, CRC methods, speed, diagnostics, network topology, and when to choose each. Based on the original Modicon Modbus specification and IEC 61784-1.
Modbus Troubleshooting in SCADA — 15 Real Field Problems Engineers Face
Practical Modbus troubleshooting guide for SCADA engineers. Learn 15 real field problems, exception errors, RS-485 issues, and proven solutions to fix communication fast.
Best Free SCADA Software in 2026: 12 Open-Source and Free Platforms Compared
Compare 12 free SCADA software platforms for 2026. Covers Rapid SCADA, SCADA-LTS, JSON-SCADA, Ignition, and more with protocols, tag limits, and download links.
Modbus Data Types: Decode Register Values Correctly
Modbus data types explained: UINT16, INT16, hex, binary, ASCII, 32-bit integers, IEEE-754 floats, and bitmasks, plus how to pick the right format every time.
Modbus TCP/IP Explained: Complete Beginner-to-Expert Guide
Modbus TCP/IP explained from the ground up: ADU structure, encapsulation across network layers, big-endian data, the client-server model, and function codes.
Free Modbus Decoder & Encoder Online - Instantly Decode RTU & TCP Data
Free browser-based Modbus decoder and encoder. Analyze RTU and TCP frames, display register values correctly, and debug PLC communication fast.
Modbus TCP Port 502: Setup, Security, Troubleshooting
Modbus TCP port 502 in depth: IANA registration, connection lifecycle, client limits, firewall rules, Wireshark filters, and the TLS secure variant on port 802.
How to Monitor SCADA Protocol Traffic (Modbus RTU/TCP, IEC-104, DNP3, IEC-61850)
Learn how to monitor Modbus, IEC-104, DNP3, and IEC 61850 traffic. Capture and analyze SCADA communication over serial and TCP/IP for reliable system performance.
Modbus over RS485 Communication Frequency and Baud Rate
Modbus over RS485 communication frequency explained: real baud rate limits, bit timing, cable length, and how to size your poll cycle correctly in the field.
Modbus vs DNP3: A Technical Comparison for SCADA Engineers
Technical comparison of Modbus vs DNP3 (IEEE 1815) protocols covering architecture, communication layers, reliability, and cybersecurity.
Python Modbus Libraries Comparison: The Complete 2025 Guide
Compare top Python Modbus libraries—PyModbus, MinimalModbus, Modbus-tk, and more—to choose the best library for your industrial or IoT project.
Best Free Modbus Software: 10 Tools for RTU and TCP Testing
Best free Modbus software for engineers: 10 tools for RTU, TCP, and ASCII testing. Master utilities, slave simulators, sniffers, and monitors compared.
Modbus RTU to Modbus TCP: Gateway Setup and Conversion
Modbus RTU to Modbus TCP conversion step by step: frame translation byte by byte, hardware and software gateway setup, Unit ID mapping, and timeout tuning.
Modbus RTU vs Modbus TCP: Frames and Key Differences
Modbus RTU vs Modbus TCP compared field by field: frame structure, CRC versus MBAP header, addressing, performance, and migrating serial devices to Ethernet.
RS-485 vs Ethernet: Choosing the Right Network for Modbus
Compare RS-485 vs Ethernet for Modbus communication. Learn key differences, pros, and best use cases to choose the right Modbus network for your system.
Modbus Protocol Explained: RTU, TCP, ASCII, and Frames
Modbus protocol explained end to end: RTU, TCP, and ASCII variants, frame structure, function codes, master-slave architecture, and field troubleshooting.