https://wiki.jw-tech.eu/index.php?action=history&feed=atom&title=WSAL23778_%E2%80%93_TTL_TO_RS485_%28B%29%2FenWSAL23778 – TTL TO RS485 (B)/en - Versionsgeschichte2026-10-23T21:59:25ZVersionsgeschichte dieser Seite in JW Tech WikiMediaWiki 1.43.9https://wiki.jw-tech.eu/index.php?title=WSAL23778_%E2%80%93_TTL_TO_RS485_(B)/en&diff=2911&oldid=prevJWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex2026-09-06T07:58:53Z<p>Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex</p>
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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.<br />
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== Summary ==<br />
The rail-mount TTL-to-RS485 converter converts TTL signals into balanced differential RS485 signals and supports half-duplex communication over up to 1200 m. It provides 600 W lightning protection, 15 kV ESD protection, TVS surge suppression, and a switchable 120 Ω termination resistor.<br />
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== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL23778 WSAL23778 – Rail-mount TTL To RS485 Galvanic isolated Converter, 600W Lightningproof &amp;amp; Anti-Surge, Multi-Isolation Protection]<br />
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== Technical overview ==<br />
* Galvanically isolated TTL-to-RS485 converter for DIN-rail mounting on a 35 mm DIN rail.<br />
* Compatible with the TTL/RS422 standard; supports half-duplex communication.<br />
* Input level: 3.3 V to 5 V TTL; the power input includes reverse-connection and over-voltage protection circuits.<br />
* Mounting: ABS case with DIN-rail clip, dimensions 91.6 × 58.7 × 23.3 mm.<br />
* RS485 side: screw terminals, transmission distance approx. 1200 m, point-to-multipoint operation supporting up to 32 nodes (repeaters recommended for 16 or more).<br />
* Integrated 120 Ω resistor with a toggle switch: up = enabled, down = disabled.<br />
* Protection circuits: TVS against transients, resettable fuse, protection diodes for over-current and over-voltage.<br />
* The Modbus protocol must be implemented at the protocol layer; the module itself is only a voltage/signal converter with no built-in parameter configuration.<br />
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== Notes and version constraints ==<br />
* The maximum stop-bit setting depends on the connected devices; if communication fails, disable the 120 Ω resistor by flipping the switch down.<br />
* When using 16 or more RS485 nodes, insert a repeater to maintain signal integrity.<br />
* The exact current draw varies with operating state; the stated average value (0.054 A at 5 V) applies only under defined test conditions.<br />
* Before commissioning, verify whether the RS485 endpoint requires a GND connection; ground it if necessary.<br />
* Because RS485 is half-duplex, transmitting and receiving cannot occur simultaneously; factor this into system design.<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/TTL_TO_RS485_(B) TTL TO RS485 (B) - Waveshare Wiki]<br />
* Source revision: 87643<br />
* Captured: 2026-09-04T03:29:24+00:00<br />
* SHA-256: <code>8af5ac738b745fa05fec02d2ba392944475c9d13e20adcb0a8136323ddb64828</code></div>JWTechPublisher