node-red-contrib-knx-ultimate/KNXEngine/dptlib/dpt20.js

Control your KNX intallation via Node-Red! Single Node KNX IN/OUT with optional ETS group address importer. Easy to use and highly configurable.

/**
* KNXEngine - a KNX protocol stack in Javascript
* (C) 2020-2022 Supergiovane
*/

const knxLog = require('./../KnxLog');

//
// DPT20: 1-byte HVAC
//
// FIXME: help needed
exports.formatAPDU = function (value) {
    var apdu_data = Buffer.alloc(1);
    apdu_data[0] = value;
    knxLog.get().debug('./knx/src/dpt20.js : input value = ' + value + '   apdu_data = ' + apdu_data);
    return apdu_data;
}

exports.fromBuffer = function (buf) {
    if (buf.length != 1) {
        knxLog.get().warn("DPT20: Buffer should be 1 byte long, got", buf.length);
        return null;
    } else {
        var ret = buf.readUInt8(0);
        //knxLog.get().debug('               dpt20.js   fromBuffer : ' + ret);
        return ret;
    }
}


exports.basetype = {
    "bitlength": 8,
    "range": [,],
    "valuetype": "basic",
    "desc": "1-byte",
    "help":
        `// Send Value. Example for HVAC: 0 = Auto, 1 = Comfort, 2 = Standby, 3 = Economy, 4 = Building protection
msg.payload = 1; // Set to Comfort
return msg;`,
    "helplink": ""
}

exports.subtypes = {
    // 20.102 HVAC mode
    "102": {
        "name": "HVAC Mode",
        "desc": "",
        "unit": "",
        "scalar_range": [,],
        "range": [,]
    }
}