Paxton Net2 Controllo accessi a KNX: SDK OEM e automazione eventi porta

Sottoscrizione eventi SDK Net2 in C# (semplificata)

// Install: Paxton.Net2.OemClientLibrary (COM reference)
// Install: KNXLib (NuGet) — knxdotnet KNX IP Interface

var net2 = new Paxton.Net2.OemClient();
net2.Connect("localhost", Net2Port);
net2.OnEventReceived += OnNet2Event;

void OnNet2Event(Net2Event evt) {
  switch (evt.EventType) {
    case EventType.AccessGranted:
      var mapping = config.GetKnxMapping(evt.DoorId);
      if (mapping != null) {
        knx.Action(mapping.GroupAddress, true); // DPT 1.001
        knx.Action(mapping.HvacGroupAddress, true); // HVAC occupied
      }
      break;
    case EventType.AccessDenied:
      // optional: write to security alert GA
      break;
    case EventType.AlarmActivated:
      knx.Action("8/0/1", true); // alarm relay
      break;
  }
}

// config.json mapping example:
// { "doorId": 101, "ga": "3/0/1", "hvacGa": "4/0/1" }
// { "doorId": 102, "ga": "3/1/1", "hvacGa": "4/1/1" }

Formato evento seriale RS232 e parsing Node-RED

Net2 ACU RS232 output (9600 baud, 8N1):
  ASCII string per event: "DOOR:101,EVENT:ACCESS_GRANTED,USER:Smith
"

Node-RED serial in node:
  Port: /dev/ttyUSB0 (or COM3 on Windows)
  Baud: 9600, 8N1
  Split: on newline character

Function node — parse and route:
  const parts = msg.payload.split(",");
  const doorId = parts[0].split(":")[1];
  const event = parts[1].split(":")[1];
  if (event === "ACCESS_GRANTED" && doorId === "101") {
    msg.knxGA = "3/0/1";
    msg.knxValue = true;
  }
  return msg;

KNX write node → IP Interface → KNX bus

Limitation: RS232 event format is not officially documented
  by Paxton — verify exact format with your ACU firmware version
  before building production automation on this approach

Ufficio UK – evento di accesso al controllo edificio KNX

Morning arrival (first AccessGranted at main entrance):
  → KNX GA 3/0/0 = true (lobby lights ON)
  → KNX GA 4/0/0 = true (HVAC building occupied mode)
  → KNX GA 5/0/0 = false (disable night setback)

End of day — last user leaves after 18:00:
  C# service tracks occupancy count per door zone
  When count reaches zero after 18:00:
  → KNX GA 4/0/0 = false (HVAC setback mode)
  → KNX GA 3/0/0 = false (lights off — after 60s delay)
  → KNX GA 5/0/0 = true (night setback active)

Fire alarm integration (Net2 AlarmActivated event):
  → KNX GA 8/0/1 = true (fire alarm relay to KNX PA system)
  → KNX GA 3/0/1 = 255 (emergency lighting full brightness)
  Net2 also releases all doors to fail-safe unlocked state
  KNX door strike outputs (if any) also release via KNX GA

Cablaggio Beckhoff TwinCAT OSDP + KNX

Hardware:
  Beckhoff CX9020 controller
  EL6700 RS485 EtherCAT terminal → OSDP v2 reader (RS485 bus)
  EL6900 KNX EtherCAT terminal → KNX TP bus

TwinCAT configuration:
  Install OSDP library (Beckhoff TE6730 or third-party)
  Configure EL6700 as OSDP master, reader as slave ID 1
  Map card number data → TwinCAT PLC variable CardNumber

TwinCAT PLC logic (Structured Text):
  IF CardNumber <> 0 AND CardNumber = ValidCard1 THEN
    KNX_WriteGA(GA := '3/0/1', Value := TRUE); // lobby lights
    KNX_WriteGA(GA := '4/0/1', Value := TRUE); // HVAC occupied
  END_IF

Advantage: no Windows PC server required
  DIN-rail controller fits inside LV panel
  KNX EL6900 certified for KNX TP communication
  Single controller, single point of maintenance

Carta camera d'albergo a scena di benvenuto KNX

Card inserted into room holder (Net2 AccessGranted):
  → KNX GA 6/R/0 = true (Gira card switch 24V trigger activated)
  → KNX Scene "Room Welcome" fires:
      GA 3/R/0 = 80 (room lights 80% DPT 5.001)
      GA 4/R/0 = true (HVAC room comfort mode)
      GA 9/R/0 = 21 (room thermostat setpoint 21°C)

Card removed from holder (Net2 AccessGranted — out):
  → KNX GA 6/R/0 = false (Gira card switch deactivated)
  → KNX 60-second delay timer starts
  → After 60s:
      GA 3/R/0 = 0 (room lights off)
      GA 4/R/0 = false (HVAC setback mode)
      GA 9/R/0 = 18 (setback setpoint 18°C)

Net2 room door reader also logs entry/exit times
  — useful for housekeeping scheduling and BREEAM evidence

Note: R = room number (1-100) in the GA scheme
  Each room has its own GA sub-group for independent control

Flusso di lavoro di correlazione dati occupazione vs energia

1. Net2 scheduled report: export occupancy_floor_hourly.csv
   Columns: date, hour, floor, user_count
   Automation: Net2 Task Scheduler exports nightly at 01:00

2. KNX energy meter data (SOCOMEC Countis E14):
   Modbus TCP → LOYTEC LROC gateway → KNX GA 6/E/1 (kWh)
   Logged to building energy management system (BEMS) database
   or InfluxDB via Node-RED

3. Python script merges datasets:
   energy_per_hour = InfluxDB query (kWh by floor, by hour)
   occupancy_per_hour = CSV import (users by floor, by hour)
   energy_per_person = energy_per_hour / occupancy_per_hour
   Output: energy_intensity.csv for BREEAM assessor

4. BREEAM Hea 04 evidence:
   Demonstrates energy reduction during low occupancy periods
   Confirms KNX setback automation is effective
   Shows energy-per-person improvement over 12-month period