See It in Action
A modern, intuitive interface for professional Modbus testing and simulation.
Address Scanner
Live Charts
Connection Setup
Test, debug, and simulate Modbus devices without physical hardware. Live data monitoring, fault simulation, and real-time register testing. Master + Slave modes included — no subscriptions, no separate purchases.
Windows 10/11 · 64-bit · Free 30-day trial · No credit card · Download page →
A modern, intuitive interface for professional Modbus testing and simulation.
Address Scanner
Live Charts
Connection Setup
x86, x64, or ARM. Note that for ARM processors, Windows 11 is often required for the best performance.
While the app can run on older hardware, users on JWTalk recommend at least 8GB of RAM and 256GB of storage for a lag-free experience when handling large video libraries.
The Kingdom Interlinear translation specifically requires at least Android 4.0, but the main app will not install on such old versions. 3. Apple iOS and iPadOS
Android 8.0 or later . Older versions like Android 7.0 are no longer supported by current updates.
The JW Library app for Windows is designed for desktop and hybrid devices. According to the Microsoft Store , the requirements are:
Android requirements have increased over time to maintain security and performance.
Direct pricing. No marketing overhead. No subscriptions. Just great software.
One tool. Both sides of the protocol. Full visibility. Master + Slave included — competitors charge separately.
TCP, UDP, RTU, ASCII, RTU-over-TCP, ASCII-over-TCP, RTU-over-UDP, ASCII-over-UDP. RS-485 RTS toggle and local echo support. jw library system requirements
FC01-06, FC08 Diagnostics, FC11 Event Counter, FC15/16 multi-write, FC17 Report Server ID, FC22 Mask Write, FC23 Read/Write, FC43 Device Info. x86, x64, or ARM
Real-time line charts with up to 8 simultaneous address traces. Color-coded, auto-scrolling, time-based display. Older versions like Android 7
16-bit signed/unsigned/hex/binary/BCD, 32-bit float (4 byte orders), 64-bit double, 32/64-bit long, and ASCII string.
Log to CSV or XLSX in real-time. Print or export to PDF. REST API for Excel/VBA integration. Full communication logger with TX/RX hex data.
NEW: Raw frame analysis, exception injection, burst/adaptive polling, frame-level diagnostics. PLUS: Test Center, Address Scanner, color rules, scaling/offset, broadcast mode, ENRON/DANIEL addressing.
21+ display formats with 4 byte-order options. Scaling, offset, and conditional color rules.
x86, x64, or ARM. Note that for ARM processors, Windows 11 is often required for the best performance.
While the app can run on older hardware, users on JWTalk recommend at least 8GB of RAM and 256GB of storage for a lag-free experience when handling large video libraries.
The Kingdom Interlinear translation specifically requires at least Android 4.0, but the main app will not install on such old versions. 3. Apple iOS and iPadOS
Android 8.0 or later . Older versions like Android 7.0 are no longer supported by current updates.
The JW Library app for Windows is designed for desktop and hybrid devices. According to the Microsoft Store , the requirements are:
Android requirements have increased over time to maintain security and performance.
Download includes a 30-day free trial. No credit card required.
Windows 10/11 · 64-bit · 118 MB
Windows SmartScreen Warning?
After downloading, Windows may show a "Windows protected your PC" warning. This is normal for new software. To install:
1. Click "More info"
2. Click "Run anyway"
The app is 100% safe — no malware, no adware.