feat(psu): switch a Modbus RTU bench supply from OpsLog

The manufacturer's document arrived, so this is no longer guesswork: 9600 8N1,
function codes 03 and 06 only, and a register map with the output on/off at
0x0001, the measurements at 0x0010…0x0013 and the set points at 0x0030/0x0031.

ONE REGISTER IS WRITTEN — 0x0001, the output. The map also exposes the voltage
and current set points and the three protection trip levels as writable, and
none of them belong to a logbook: a wrong value there is 30 V where a radio
expected 13.8, or a trip level lifted on a supply feeding an amplifier. They are
read and displayed instead, next to the measured values, which is also how an
operator sees at a glance that the supply is on and the radio is drawing nothing.

The wire layer is tested where it can be. CRC-16/MODBUS is pinned against its
published check value — the CRC of "123456789" is 0x4B37 — which fixes the
polynomial, the initial value, the reflection and the absence of a final xor all
at once; the rest of the protocol is checked frame by frame against the manual,
including the byte order of the CRC, an exception reply told apart from a broken
line, and a reply from another slave on the bus refused. The write echo must
match the value sent: it is the only confirmation the output really switched,
and accepting the frame without it is how a radio ends up dark behind a green
light.

Framing follows the manual's own rules: 3.5 character times of silence between
frames (4 ms at 9600), and a frame is over when the line falls quiet — Modbus
RTU has no terminator, and a serial read that times out returns (0, nil) here,
so the reader is built on a deadline and a quiet-time rather than on an error
that never comes.

Untested against hardware — nobody here has the supply.

frontend/src/lib/i18n.tsx

@@ -161,7 +161,9 @@ const en: Dict = {
   'station.title': 'Station Control', 'station.rotator': 'Rotator', 'station.rotateTo': 'Rotate to {az}°', 'station.rotatorNoRead': 'No heading read', 'station.bands': 'Bands', 'station.nudgeUp': 'Up {n} kHz', 'station.nudgeDown': 'Down {n} kHz', 'station.trackOn': 'Tracking on', 'station.trackOff': 'Tracking off', 'station.trackStepTip': 'Re-tune only when the rig has moved this far', 'station.trackModeTip': 'When the antenna is allowed to re-tune', 'station.trackAlways': 'Every frequency change', 'station.trackStep': 'Past a step', 'station.trackBand': 'Band change only', 'station.trackAlwaysTip': 'Follow every frequency change. Best resonance, but the motors run constantly — and on a SteppIR every move blocks transmit while the elements travel.', 'station.trackStepTipMode': 'Re-tune only once the rig has moved further than the step. Follows a QSY, ignores tuning around.', 'station.trackBandTip': 'Re-tune only when the band changes. The motors move a few times a day and are left alone within a band.', 'station.pattern': 'Pattern', 'station.bi': 'Bi', 'station.retract': 'Retract elements', 'station.moving': 'MOVING', 'station.elements': 'Elements (mm)', 'station.read': 'Read', 'station.readLengths': 'Read current element lengths from the controller', 'station.noLengths': 'Lengths unknown — click Read to fetch them from the controller.', 'station.element': 'Element', 'station.reflector': 'Reflector', 'station.driven': 'Driven', 'station.director': 'Dir', 'station.set': 'Set', 'station.elementsHint': 'Each press lengthens/shortens the element by 2 mm (like the physical console). Verify which element responds on your antenna.', 'station.setExactLen': 'Click to type the exact current length (fixes the baseline if the auto-read is off).', 'station.atMax': 'Controller refused — the element is likely at its maximum length for this band, so it can\'t extend further.', 'station.go': 'Go', 'station.stop': 'Stop', 'station.dragHint': 'Drag the grip handle on the left of a panel to move it. Pick a column count to lay them out in a grid.', 'station.dragMove': 'Drag to move this panel', 'station.colsAuto': 'Auto', 'station.addDevice': 'Add device', 'station.editDevice': 'Edit device', 'station.empty': 'No relay boards yet. Add a WebSwitch 1216H or a KMTronic 8-relay board to control your station power and accessories.', 'station.online': 'Online', 'station.offline': 'Offline', 'station.edit': 'Edit', 'station.delete': 'Delete', 'station.relay': 'Relay', 'station.on': 'ON', 'station.off': 'OFF', 'station.type': 'Device type', 'station.name': 'Name', 'station.host': 'Host / IP', 'station.hostHint': 'LAN IP for local use. To reach the board from OUTSIDE, put a full URL here — e.g. https://relay.yourdomain.com — pointing at a reverse proxy (Nginx Proxy Manager…) that fronts the board’s HTTP port.', 'station.user': 'Username', 'station.pass': 'Password', 'station.optional': 'optional', 'station.ftdiSerial': 'FTDI serial number', 'station.detect': 'Detect', 'station.ftdiHint': 'The Denkovi board is driven via FTDI bit-bang (not the COM port). Pick its serial (e.g. DAE0006K). Needs the FTDI D2XX driver installed.', 'station.channels': 'Relays', 'station.comPort': 'COM port', 'station.noPorts': 'No ports found', 'station.usbRelayHint': 'Cheap USB-serial relay boards (CH340/LCUS) using the A0 command protocol. If yours does not switch, tell me its model / command set.', 'station.labels': 'Relay labels', 'station.cancel': 'Cancel', 'station.save': 'Save', 'station.test': 'Test connection', 'station.testOk': 'Connected — {n} relays', 'station.testFail': 'Not connected', 'station.detectNone': 'No FTDI board found — check the cable and that the D2XX driver is installed.', 'station.detectFound': '{n} board(s) detected.',
   'awards.followHint': 'Awards shown in the Awards tab. Leave the right side empty to show them all.', 'awards.available': 'All awards', 'awards.followed': 'Followed', 'awards.search': 'Filter…', 'awards.addAll': 'Add all', 'awards.clear': 'Clear', 'awards.allTracked': 'All awards are followed.', 'awards.noneFollowed': 'Nothing followed yet — the Awards tab shows all.',
   'sec.awards': 'Awards', 'sec.cat': 'CAT interface', 'sec.rotator': 'Rotator', 'sec.winkeyer': 'CW Keyer',
-  'sec.antenna': 'Ultrabeam / Steppir', 'sec.antgenius': 'Antenna Genius', 'sec.tunergenius': 'Tuner Genius', 'sec.pgxl': 'Amplifier', 'sec.flex': 'FlexRadio', 'sec.audio': 'Audio devices',
+  'sec.antenna': 'Ultrabeam / Steppir', 'sec.antgenius': 'Antenna Genius', 'sec.tunergenius': 'Tuner Genius', 'sec.pgxl': 'Amplifier', 'sec.psu': 'Power supply',
+  'psu.title': 'Bench power supply (Modbus RTU)', 'psu.hint': 'A programmable supply on a serial port — BSIDE, Wanptek and the other Modbus RTU supplies that use function codes 03 and 06. OpsLog shows what it is delivering and switches its output on and off.', 'psu.enable': 'Control this power supply', 'psu.port': 'COM port', 'psu.baud': 'Baud', 'psu.address': 'Modbus address', 'psu.wireHint': '9600 baud, 8 data bits, no parity, 1 stop bit, address 1 — the factory settings. Change them here only if you changed them on the supply.', 'psu.writeScope': 'OpsLog only ever writes the output on/off. The voltage, current and protection settings are read and displayed, never changed — those stay on the supply’s own panel.', 'psu.output': 'Output', 'psu.setTo': 'set to', 'psu.tripped': 'PROTECTION TRIPPED', 'psu.offline': 'Not responding',
+ 'sec.flex': 'FlexRadio', 'sec.audio': 'Audio devices',
   // CW Keyer settings panel
   'wk.enable': 'Enable CW keyer (shows the keyer panel)', 'wk.engine': 'Keyer engine',
   'wk.escClears': 'ESC clears the callsign too (otherwise ESC only stops transmission)',
@@ -596,7 +598,9 @@ const fr: Dict = {
   'station.title': 'Contrôle station', 'station.rotator': 'Rotator', 'station.rotateTo': 'Tourner vers {az}°', 'station.rotatorNoRead': 'Azimut non lu', 'station.bands': 'Bandes', 'station.nudgeUp': 'Monter de {n} kHz', 'station.nudgeDown': 'Descendre de {n} kHz', 'station.trackOn': 'Suivi actif', 'station.trackOff': 'Suivi inactif', 'station.trackStepTip': 'Ne réaccorder que si le rig a bougé d au moins ça', 'station.trackModeTip': "Quand l'antenne a le droit de se réaccorder", 'station.trackAlways': 'À chaque changement', 'station.trackStep': 'Au-delà d un pas', 'station.trackBand': 'Changement de bande', 'station.trackAlwaysTip': "Suivre chaque changement de fréquence. Résonance idéale, mais les moteurs tournent en permanence — et sur une SteppIR chaque déplacement bloque l'émission le temps du mouvement.", 'station.trackStepTipMode': "Ne réaccorder qu'une fois le rig sorti du pas. Suit un QSY, ignore la recherche autour.", 'station.trackBandTip': "Ne réaccorder qu'au changement de bande. Les moteurs bougent quelques fois par jour et restent tranquilles dans une bande.", 'station.pattern': 'Diagramme', 'station.bi': 'Bi', 'station.retract': 'Rétracter les éléments', 'station.moving': 'EN MOUVEMENT', 'station.elements': 'Éléments (mm)', 'station.read': 'Lire', 'station.readLengths': 'Lire les longueurs actuelles depuis le contrôleur', 'station.noLengths': 'Longueurs inconnues — clique sur Lire pour les récupérer depuis le contrôleur.', 'station.element': 'Élément', 'station.reflector': 'Réflecteur', 'station.driven': 'Radiateur', 'station.director': 'Dir', 'station.set': 'Régler', 'station.elementsHint': "Chaque appui allonge/raccourcit l'élément de 2 mm (comme le pupitre). Vérifie quel élément répond sur ton antenne.", 'station.setExactLen': "Clique pour taper la longueur actuelle exacte (recale la base si la lecture auto est fausse).", 'station.atMax': "Refusé par le contrôleur — l'élément est probablement en butée (longueur max pour cette bande), il ne peut plus s'allonger.", 'station.go': 'Aller', 'station.stop': 'Stop', 'station.dragHint': 'Glisse la poignée à gauche d un panneau pour le déplacer. Choisis un nombre de colonnes pour la disposition.', 'station.dragMove': 'Glisser pour déplacer ce panneau', 'station.colsAuto': 'Auto', 'station.addDevice': 'Ajouter un appareil', 'station.editDevice': "Modifier l'appareil", 'station.empty': "Aucune carte relais. Ajoute un WebSwitch 1216H ou une carte KMTronic 8 relais pour piloter l'alimentation et les accessoires de ta station.", 'station.online': 'En ligne', 'station.offline': 'Hors ligne', 'station.edit': 'Modifier', 'station.delete': 'Supprimer', 'station.relay': 'Relais', 'station.on': 'ON', 'station.off': 'OFF', 'station.type': "Type d'appareil", 'station.name': 'Nom', 'station.host': 'Hôte / IP', 'station.hostHint': "IP du LAN en local. Pour joindre la carte depuis L'EXTÉRIEUR, saisis une URL complète ici — ex. https://relais.tondomaine.com — pointant vers un reverse proxy (Nginx Proxy Manager…) qui expose le port HTTP de la carte.", 'station.user': "Nom d'utilisateur", 'station.pass': 'Mot de passe', 'station.optional': 'optionnel', 'station.ftdiSerial': 'Numéro de série FTDI', 'station.detect': 'Détecter', 'station.ftdiHint': "La carte Denkovi se pilote en FTDI bit-bang (pas via le port COM). Choisis son numéro de série (ex. DAE0006K). Nécessite le driver FTDI D2XX installé.", 'station.channels': 'Relais', 'station.comPort': 'Port COM', 'station.noPorts': 'Aucun port', 'station.usbRelayHint': "Cartes USB-série bon marché (CH340/LCUS) protocole A0. Si la tienne ne commute pas, donne-moi le modèle / jeu de commandes.", 'station.labels': 'Libellés des relais', 'station.cancel': 'Annuler', 'station.save': 'Enregistrer', 'station.test': 'Tester la connexion', 'station.testOk': 'Connecté — {n} relais', 'station.testFail': 'Non connecté', 'station.detectNone': 'Aucune carte FTDI trouvée — vérifie le câble et que le driver D2XX est installé.', 'station.detectFound': '{n} carte(s) détectée(s).',
   'awards.followHint': 'Diplômes affichés dans l’onglet Awards. Laisse la colonne de droite vide pour tous les afficher.', 'awards.available': 'Tous les diplômes', 'awards.followed': 'Suivis', 'awards.search': 'Filtrer…', 'awards.addAll': 'Tout ajouter', 'awards.clear': 'Vider', 'awards.allTracked': 'Tous les diplômes sont suivis.', 'awards.noneFollowed': 'Aucun pour l’instant — l’onglet Awards les montre tous.',
   'sec.awards': 'Diplômes', 'sec.cat': 'Interface CAT', 'sec.rotator': 'Rotator', 'sec.winkeyer': 'Manipulateur CW',
-  'sec.antenna': 'Antenne motorisée', 'sec.antgenius': 'Antenna Genius', 'sec.tunergenius': 'Tuner Genius', 'sec.pgxl': 'Amplificateur', 'sec.flex': 'FlexRadio', 'sec.audio': 'Périphériques audio',
+  'sec.antenna': 'Antenne motorisée', 'sec.antgenius': 'Antenna Genius', 'sec.tunergenius': 'Tuner Genius', 'sec.pgxl': 'Amplificateur', 'sec.psu': 'Alimentation',
+  'psu.title': 'Alimentation de laboratoire (Modbus RTU)', 'psu.hint': 'Une alimentation programmable sur port série — BSIDE, Wanptek et les autres alimentations Modbus RTU utilisant les codes fonction 03 et 06. OpsLog affiche ce qu’elle débite et commute sa sortie.', 'psu.enable': 'Piloter cette alimentation', 'psu.port': 'Port COM', 'psu.baud': 'Vitesse', 'psu.address': 'Adresse Modbus', 'psu.wireHint': '9600 bauds, 8 bits de données, sans parité, 1 bit de stop, adresse 1 — les réglages d’usine. Ne les changez ici que si vous les avez changés sur l’alimentation.', 'psu.writeScope': 'OpsLog n’écrit jamais que la marche/arrêt de la sortie. La tension, le courant et les protections sont lus et affichés, jamais modifiés — ils restent sur la face avant de l’alimentation.', 'psu.output': 'Sortie', 'psu.setTo': 'réglée sur', 'psu.tripped': 'PROTECTION DÉCLENCHÉE', 'psu.offline': 'Ne répond pas',
+ 'sec.flex': 'FlexRadio', 'sec.audio': 'Périphériques audio',
   // Panneau Manipulateur CW
   'wk.enable': 'Activer le manipulateur CW (affiche le panneau)', 'wk.engine': 'Moteur du manipulateur',
   'wk.escClears': "ÉCHAP efface aussi l'indicatif (sinon ÉCHAP arrête seulement la transmission)",