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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The isolated multi-bus converter (item WSAL21411) converts USB signals to RS232, RS485 and TTL. It includes built-in power-supply and signal isolation plus TVS, over-voltage and over-current protection, and is aimed at industrial control applications with high communication requirements.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL21411 WSAL21411 – Industrial Isolated Multi-Bus Converter, USB / RS232 / RS485 / TTL Communication]

== Technical overview ==
* Uses the FT232RL chip for USB communication; data rates of 300–921600 baud, or 300–600000 baud for RS232-to-RS232.
* Group A: USB port via USB-B, 5 V operating voltage, 200 mA resettable fuse; RS232 via DB9 male with TVS, surge and ESD protection; TTL via screw terminals (TXD, RXD, GND, 5 V) with clamping diodes.
* Group B: RS485 via screw terminals (A+, B-, GND) with automatic hardware direction control, point-to-multipoint mode supporting up to 32 nodes (repeaters recommended from 16 nodes); RS232 via DB9 male; TTL with selectable 3.3 V/5 V level via screw terminals (TXD, RXD, GND).
* Integrated monolithic power-supply and digital isolation; no separate power supply needed at the isolated terminal.
* TVS diodes suppress surge and transient spike voltages; a resettable fuse and protection diodes keep output current/voltage stable.
* Aluminium-alloy enclosure with a matte oxidized finish, described as solid and durable.
* Operating environment: -25 °C to 85 °C, humidity 5% RH to 95% RH.
* Supported operating systems per source: Windows 11/10/8.1/8/7/XP; per FAQ also Mac, Linux, Android and WinCE.
* Only one pair of devices can communicate between Group A and Group B at the same time; same-group communication (A-to-A or B-to-B) is not supported.
* A pad for a 120 Ω termination resistor is reserved on the RS485 port; add it to the beginning/terminal device when connecting multiple devices.

== Notes and version constraints ==
* Driver files (FT232 32/64-bit) must be downloaded and installed manually if the system does not auto-detect the driver (yellow exclamation mark in Device Manager).
* If short-range RS485 communication is abnormal, remove the 120 Ω termination resistor.
* The TTL level selection (3.3 V or 5 V) on Group B must be set by the user.
* For more than 16 RS485 nodes, the source recommends using repeaters; exact sizing depends on cable length and load profile.
* Non-Windows compatibility relies on the linked FTDI driver page; specific installation steps per OS are not detailed here.

== Source and revision record ==
* [https://www.waveshare.com/wiki/Multibus_Converter USB/RS232/RS485/TTL Converter - Waveshare Wiki]
* Source revision: 83366
* Captured: 2026-09-03T02:47:50+00:00
* SHA-256: <code>f05deb3a4d83ef0cd912ec0ad2b21f3b4d8678a85359172c383fe7d08a2a50b7</code>

WSAL21411 – Multibus Converter/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex