sacn v4.6.2

sACN receiver & sender in node.js

💡 This module can receive DMX data sent via sACN from professional lighting consoles (e.g. ETC, Onyx).

🎭 It can also send data to DMX fixtures that support sACN, e.g. LED lights, smoke machines, etc.

Install

npm install sacn

Usage - Receiver

🔦 Sending RDM data to fixtures is not implemented yet, see issue #1.

const { Receiver } = require('sacn');

const sACN = new Receiver({
  universes: [1, 2],
  // see table 1 below for all options
});

sACN.on('packet', (packet) => {
  console.log('got dmx data:', packet.payload);
  // see table 2 below for all packet properties
});

sACN.on('PacketCorruption', (err) => {
  // trigged if a corrupted packet is received
});

sACN.on('PacketOutOfOrder', (err) => {
  // trigged if a packet is received out of order
});

/* advanced usage below */

sACN.on('error', (err) => {
  // trigged if there is an internal error (e.g. the supplied `iface` does not exist)
});

// start listening to a new universe (universe 3 in this example)
sACN.addUniverse(3);

// stop listening to a universe 1
sACN.removeUniverse(1);

// close all connections; terminate the receiver
sACN.close();

sACN.universes; // is a list of the universes being listened to

Table 1 - Options for Receiver

Table 2 - Packet properties

{
  "sourceName": "Onyx", // controller that sent the packet
  "sourceAddress": "192.168.1.69", // ip address of the controller
  "universe": 1, // DMX universe
  "sequence": 172, // packets are numbered 0-255 to keep them in order
  "priority": 100, // 0-200. used if multiple controllers send to the same universe
  "payload": { // an object with the percentage values of DMX channels 1-512
    1: 100,
    2: 50,
    3: 0
  },

  /* there are more low-level properties which most
     users won't need, see the ./src/packet.ts file */
}

Usage - Sender

const { Sender } = require('sacn');

const sACNServer = new Sender({
  universe: 1,
  // see table 3 below for all options
});

async function main() {
  await sACNServer.send({
    payload: {
      // Required. An object with the percentages (0-100) for each DMX channel.
      // You can use 0-255 instead of 0-100 by setting `useRawDmxValues: true`
      // per packet, or in the `defaultPacketOptions`.
      1: 100,
      2: 50,
      3: 0,
    },
    sourceName: "My NodeJS app", // optional. LED lights will use this as the name of the source lighting console.
    priority: 100, // optional. value between 0-200, in case there are other consoles broadcasting to the same universe
  });

  sACNServer.close(); // terminate the server when your app is about to exit.
}

main(); // wrapped in a main() function so that we can `await` the promise

Table 3 - Options for Sender

Contribute

npm run build # compile typescript
npm test # run tests

Network Requirements

• Multicast must be enabled1. sACN uses port 5568 on 239.255.x.x
• Network infrastructure that supports at least 100Mbps (100BaseT)

Protocol Docs

The Architecture for Control Networks (ACN) and derived protocols are created by the Entertainment Services and Technology Association.

• sACN is defined in ANSI E1.31
• RDMNet is defined in ANSI E1.33

1­. Unicast is also supported by default, but this is not how sACN normally works. See Table 3 for how to send data directly to a unicast address. ↩