v0.9.0 Beta · Actively maintained
Tyrant Suite.
Many industrial protocols.
One application.
A free Windows testing tool for developers and programmers going head-to-head with a wide range of industrial devices — Modbus, Siemens S7, Serial RS232, TCP/UDP, OPC UA, Omron FINS and more.
Tyrant was born to bring industrial communication testing — normally split across half a dozen different apps — into a single tool.
TCP, UDP, Serial, Modbus TCP/RTU, S7, OPC UA and Omron FINS in one clear, portable interface built for the plant floor: send, receive, analyze, test and debug communications without relying on ancient tools, paid software or complicated setups.
What it speaks
Protocols & tools.
Every channel Tyrant understands, and the utilities built around them from real field debugging.
Modbus RTU ClientRS-485
FC 1–6, 15–16 over RS-485/RS-232. Visual register maps for Coils, Inputs, Holding and Input Registers. Configurable Unit ID, address, quantity and timeout. Auto CRC-16 calculation and validation on every frame.
Modbus RTU ServerSim
Simulates a complete Modbus RTU device. Maintains 4 independent arrays (Coils 0–9999, Discrete Inputs, Input Registers, Holding Registers). Listens asynchronously, validates CRC, builds correct responses.
Modbus TCP ClientTCP
Same function codes as RTU but over Ethernet — port 502 by default, fully configurable. Adds MBAP header with Transaction ID for frame synchronisation. Visual register maps and coloured HEX console.
Modbus TCP ServerTCP
TCP listener on a configurable port (502 by default) with auto-detected local IP. Handles multiple simultaneous clients. Configurable register values per address. Full request/response log.
Serial RS232COM
Generic serial terminal for any RS-232 device. Full line config: baudrate, parity, data bits, stop bits, handshake (RTS/CTS, DTR/DSR). Separate TX/RX consoles, HEX view and log export.
TCP/IP ClientTCP
TCP client with optional ping before connect. Auto-response engine via Tyrant Command Processor. Async receive loop, HEX mode, full coloured console.
TCP/IP ServerTCP
TCP server that accepts multiple simultaneous clients. Client list DataGrid shows IP, port and timestamp. Broadcast to all or send to an individual client.
UDPUDP
UDP client with separate local and remote port config. Background async receive. Optional CR/LF append. Separate TX/RX consoles.
Siemens S7Sharp7
Connects to Siemens S7-300/400/1200/1500 via Sharp7 library. Reads and writes DB, M, I, Q areas with full type support: Bool, Byte, Word, DWord, Real, String. Address syntax: DB10.DBX0.0 · DB10.DBW2 · MW100. Latency measurement per operation.
OPC UAWIP
OPC UA client following IEC 62541 standard — the modern unified communication architecture for secure, platform-independent industrial data exchange. Currently in active development.
Omron FINSWIP
Omron FINS client (Factory Interface Network Service) — Omron's native protocol for CS/CJ/NJ series PLCs over UDP/TCP, for reading and writing memory areas (CIO, DM, WR, HR). Currently in active development.
I/O
BUS
BUS
Modbus RTU ExplainedDecoder
Visual frame decoder. Enter any Modbus RTU frame in HEX and get a field-by-field breakdown: address, function code, data, CRC position and value.
Modbus CRC CalculatorCRC-16
3 independent CRC-16 calculators. Enter frames in HEX, select byte order (Low-High or High-Low), get the CRC result instantly. Essential for RTU debugging.
Modbus TCP ExplainedMBAP
Decodes the full Modbus TCP frame structure: MBAP header (Transaction ID, Protocol ID, Length, Unit ID) and PDU content.
Telegram SendN+1
3 preset message slots by default for sending data in ASCII, HEX or binary format + 1 file send slot — add or remove as many as you need to keep a whole set of messages ready to fire. Available in Serial, TCP Client, TCP Server and UDP.
Tyrant Command ProcessorGET_*
Drop-in automated response engine — over 100 GET_* commands (CPU usage, IP info, timestamps, system stats...) that Tyrant answers automatically on Serial, TCP Client, TCP Server or UDP, without writing a line of code.
S7 Address ReferenceS7
Reference table for Siemens S7 addressing syntax — DB, M, I, Q, T, C — with worked examples for bit, byte and word access.
S7 Data Type ReferenceS7
Every S7 data type — Bool, Byte, Word, DWord, Real, String — with byte size, value range and typical use, for fast type-matching.
S7 Error LookupS7
Paste a Sharp7 error code and get a plain-language explanation of the failure, with a suggested fix.
S7 DB Offset CalculatorS7
Enter a DB variable layout and get the exact byte and bit offset for each field — no more manual arithmetic.
Standalone tools
IP ScannerOUI
Parallel ping sweep over any IP range. Enriches results with MAC address (from ARP table), hostname (DNS resolve) and vendor name (OUI lookup). Live progress bar.
ARP NetARP
Displays the system ARP table — all IP/MAC pairs the OS knows about on the local network. Shows active network adapter and interface description.
ASCII Tables0–255
Three separate tables: Control chars (0–31), Printable chars (32–126) and Extended ASCII (128–255). Each shows decimal, HEX and description side by side.
Multi Converter×13
13 conversion formats: HEX · Binary · Decimal · Octal · Base64 · ROT13 · Caesar cipher · Vigenère cipher · MD5 · SHA-1 · SHA-256 · Roman numerals. Any format → any format.
Text ToolsRegex
Three utilities: Compare (side-by-side diff of two texts), Replace (regex find & replace) and Reverse (invert character or line order). Useful for log processing.
Hex EditorBytes
Binary file viewer/editor with offset, HEX and ASCII columns side by side. Search by hex pattern or text, edit bytes directly and save changes back to the file.
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Protocols supported
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Built-in tools
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Telemetry collected
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Free, forever
01
No registration.
Download and run. No account, no email wall, no license key required to use every feature.
02
No third-party wrappers.
Every protocol runs on libraries written from scratch — full control over every byte, no black-box dependency.
03
No paywall, ever.
Tyrant is free today and will stay free. If it saves you time, there's an optional way to say thanks — never a requirement.
