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Stratus Engineering makes passive serial tap modules for engineers, with core products including EZ-Tap, EZ-Tap Pro, and Versa-Tap. Their main value is that they can be inserted between two devices to monitor serial communications such as RS-232, RS-422, and RS-485, while emphasizing passive operation, no external power, no interruption, and no interference with field signals. These tools are suitable for debugging in embedded systems, industrial electronics, defense, semiconductor, and communications equipment scenarios.
EZ-Tap is the basic passive RS-232 monitoring module. It uses a dual-COM-port approach and is compatible with the free EZ-View software as well as most third-party dual-COM-port serial monitoring programs. It supports baud rates up to 230400, though the official site recommends choosing EZ-Tap Pro for speeds above 9600. EZ-Tap Pro is better suited for serious protocol analysis: it provides microsecond-level hardware timestamps, can capture RS-232 data and state changes on 6 handshake lines, supports up to 1Mbps, and can automatically detect standard baud rates up to 921600 bps. It also supports both 3.3V/5V TTL and RS-232 levels.
On the software side, Stratus provides the free EZ-View monitoring software, and Docklight RS-232 Monitor also supports EZ-Tap/EZ-Tap Pro. All three devices share the same Windows driver and appear as USB COM ports in Windows Device Manager after installation. For custom development, the official site only states that EZ-Tap Pro supports a .DLL-based Windows API, with details and examples available on request. Documentation resources include quick-start guides, user manuals, application notes, driver downloads, and introductory articles on serial monitoring. The onboarding materials are fairly complete, but there is limited public information about the API, cross-platform support, or after-sales terms.
Pricing is clear: EZ-Tap costs USD 265, EZ-Tap Pro costs USD 375, Versa-Tap costs USD 450, and EZ-View software is free. The advantages are simple deployment, non-intrusive operation, and no power requirement. The Pro version’s timestamps and handshake-line capture are especially valuable for field troubleshooting. The drawbacks are that driver support is mainly listed for Windows 2000/XP/Vista/7/8/10, with no visible macOS/Linux information; the basic version has limited capability in high-speed scenarios; and API materials require separate contact.
It is suitable for engineers who need to monitor serial links online, diagnose protocol timing issues, or analyze communications in industrial or embedded devices. The official site does not provide clear information on access or purchasing from China, so network accessibility, payment methods, shipping times, and after-sales convenience are all unknown. If procurement is difficult, alternatives include Docklight software-based solutions or USB serial capture and RS-232/485 protocol analysis hardware available domestically in China.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on stratusengineering.com official site.
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