External Connectors
WTI400 v1.2 — In service — installed on test vessel
| Connector | Style | Domain | Notes |
|---|---|---|---|
| J1 — Programming | 2×3 IDC 2.54 mm (XFCN BH254V-6P) | DIGITAL | ESP-PROG-compatible: Pin 1 = ESP_EN, Pin 2 = V_PROG, Pin 3 = ESP_TX, Pin 4 = GND, Pin 5 = ESP_RX, Pin 6 = ESP_BOOT. Developer/kit variant only |
| J2 — NMEA 2000 | M12 5-pin A-code panel socket (IEC 61076-2-101) | CAN | Pin 1 = Shield, 2 = NET-S (+12 V), 3 = NET-C (GND), 4 = NET-H, 5 = NET-L |
| J3 — Legacy Serial | 3-pin THT (CON-THT-SEATALK-0292) | LEGACY IO | Pin 1 = 12 V (red), 2 = GND (black), 3 = SIG (yellow); half-duplex, 4800 / 9600 bps |
| J4 — WIND_SHLD | Keystone 1211 solder tab | WIND | Wind transducer cable shield return |
| J5 — WIND_8V | Keystone 1211 solder tab | WIND | Transducer supply (WIND_8V, JP1-selectable) |
| J6 — WIND_X | Keystone 1211 solder tab | WIND | X-axis Hall sensor analogue output |
| J7 — WIND_Y | Keystone 1211 solder tab | WIND | Y-axis Hall sensor analogue output |
| J8 — WIND_SPD | Keystone 1211 solder tab | WIND | Anemometer speed pulse (P-line, reed-switch) |
| J9 — GND_WIND | Keystone 1211 solder tab | WIND | Transducer ground return (isolated from GNDREF via FL2 CMF) |
| JP1 — Voltage Select | 3-pin THT header 2.54 mm (PZ254V-11-03P) | WIND POWER | Positions: 8v4 = Raymarine (8.65 V), 6v8 = B&G (6.89 V); field-configurable |
For per-connector design rationale see Programming Socket, CAN Transceiver, Wind Interface, and Legacy Serial Interface.
NMEA 2000 connector pinout
The NMEA 2000 network connection (J2) is a 5-pin M12 A-coded (Micro-C) male panel-mount connector. The diagram shows the pin assignments viewed from the front (mating face) of the device connector.
| Pin | Signal | Description |
|---|---|---|
| 1 | Shield | Cable shield / drain — left floating inside the device (NMEA 2000 practice) |
| 2 | NET-S | Power supply positive (+V) |
| 3 | NET-C | Power supply common (−V) |
| 4 | NET-H | CAN-H |
| 5 | NET-L | CAN-L |
ESP-PROG programming header pinout
The programming socket (J1) is a 2×3 IDC header following the Espressif ESP-Prog "Program" convention. Full circuit detail is on the Programming Socket page.
Legacy serial connector pinout
The legacy serial connector (J3) is a 3-pin Raymarine-compatible connector. See the Legacy Serial Interface page for the isolation and signalling detail.
Connector face layout
The faceplate decal on the top face of the WTI400 housing, showing the full connector layout as installed: the NMEA 2000 socket (J2), the ESP-PROG programming header (J1), the legacy serial connector (SERIAL, J3), and the six-tab wind-transducer terminal block (J4–J9, labelled SH, +Ve, X, Y, SP, ⏚) — alongside the product marking, compliance marks, and documentation QR code.
