Paired transmitter (TX) and receiver (RX) carrying one digital host output to a field-side logic input over a dedicated twisted-pair cable. The retained candidate also sends limited low-voltage power from TX to RX. This is a source-level component selection, not a qualified product.
Baseline documentation snapshot: 2026-10-11, before the requested connector/protection/usability revision program. New revision features require their own reviewed source and qualification evidence.
This page documents an unqualified engineering study, not a released or tested product. Saved CAD, renders and automated checks do not establish a safe assembly, compatible cable, firmware support or a usable current rating.
Board-specific qualification limits: TXnative0,RX12geometry/27opens;host/boost/timing/partial STEP/physical open.
Power off before connecting or changing jumpers. Verify pin 1, signal direction, supply voltage and ground at both ends of every cable. A mechanically fitting connector is not proof of electrical compatibility. If a host pin mapping or current allocation remains unresolved in the design record, do not connect the board until it is resolved.
The following are specification requirements or study assumptions; they are not measured operating ratings. A newer selected-revision note takes precedence over historical draft options.
The design describes the following protection intent. Check the selected schematic and remaining qualification gates before relying on it:
Q1’s inherited 9 mV loss at 150 mA assumes 60 mΩ, specified for AO3401A at VGS = -4.5 V and 25 °C. The estimated 3.934–4.388 V source rail cannot provide that gate drive with a ground-biased gate. Use gate-drive- and temperature-appropriate limits before relying on the rail estimate. The gate pull-down turns Q1 on, and its ±12 V absolute gate rating is not a proven reverse-fault envelope. Typical transceiver dissipation and an assumed thermal resistance also do not establish maximum junction temperature.
Exhaustive pair review: TXv10/RXv11 retained;40 purchased MPNs match role contracts,166selected/847canonical-role listed hashes. Existing driver/boost and2.2kstock changes preserved,no successor. RX12geometry/27opens and pair host/timing/physical gates remain open.
Use the configuration and firmware contract for the exact selected revision. Do not copy another module’s socket assignments or assume that an unused pin is available. First-article work must verify source selection, reset/unplug behavior, cable orientation and the actual load or sensor interface before normal operation.
The following are requirements for the next design iterations; this page does not claim they are already fitted:
Documentation route: smoothieware.org/extensions/differential-signal-extender.
The 2026-10-11 upgrade program has saved additional candidates v12, v13, v14. These studies preserve the historical design described above. Their connector, LED, mechanical and protection changes are revision-specific and remain unqualified.
See the per-board changes, failures and remaining work and mandatory family specification. Use the source hash and native check for the exact candidate being reviewed; do not infer hardware ratings from a rendered population.
The three additional revisions are v12, v13, v14. They are engineering studies; saved CAD and renders do not release the hardware. The latest candidate is described below. Older baseline notes above remain historical.
85b9bc11df3f631b21463c119be0cbcd7f57e346d8be7d3c71ef1ac9a187abf8.JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical. Fit only the selected population; check its pin map and voltage in the design record.Applicable protection, current-path, thermal, pinout, cable access and physical tests remain open wherever the linked board record has not verified them. A zero native-error count does not close those gates.
The current retained revision is V15; the earlier readback above is historical. Uppercase version labels and documentation annotations were refreshed without changing the circuitry, placement, routing, zones, mechanics or rules. Source-bound candidate review records every role, unchanged native diagnostic categories, current models, views and manufacturing hashes. This remains a partial engineering candidate with fabrication release false.
Receiver: 32 native errors including 27 opens, 8 warnings; transmitter: zero findings. Receiver normal/STEMMA and transmitter normal packages contain 18 inspected views and 65 resolved model entries. The receiver full URL is readable; the transmitter URL is still absent after a bounded search, which does not establish impossibility. The historical approximate transmitter fuse model remains physically unqualified.
Short-title Montserrat conversion is deferred after warning-increasing retained trials. Native parity/ERC findings are zero and settings are unchanged, with no ignored rule categories or exclusions. This does not verify electrical operation, current/thermal limits, isolation, protection behavior, timing, mounting or assembly. All existing pin maps and power/cable safety limitations on this page still apply; no price or area-saving claim is made.
Receiver and transmitter registered as partial annotation improvements after source-bound independent native/history/model/export checks and all18view reviews. Three isometric connector clips were corrected through camera-only native rendering, with CAD unchanged. Receiver retains32layout errors including27unrouted connections and8warnings; transmitter and both schematics have zero findings. Receiver documentation URL is readable; transmitter URL, inherited rear title/safe-state overlaps, dense references and title-font consistency remain open. Physical and fabrication qualification remain unperformed.