node-red-contrib-remote-io/wago/WAGO_DI.js

A sample node for node-red

module.exports = function(RED) {
    "use strict";

    function digitalInput(n) {
       RED.nodes.createNode(this,n);
       var node = this;
       var bitSize = parseInt(n.outputs);
       var bitOffset = n.offset;

        this.on('input', function(msg) {
            var p = msg.payload >>> bitOffset;
            var m = [];
            var o = [];
            for (var i=0; i<16; i++) {
              // test top bit and set corresponding payload
                m[i] = {payload: ((p & 0x8000) ? true : false) };
                p = p << 1; // divide by two and keep as an integer
                }
                o = m.reverse();
            node.status({fill: "green",shape: "ring",text: bitSize});
            node.send(o);
        });
    }
    RED.nodes.registerType("Digital Input",digitalInput);
};