nixfilter-uartrfid/rdm63.js

Filters for decoding the data sent by certain RFID readers connected via UART

#!/usr/bin/env node

'use strict';
var nixfilter, utils,
  indexOf = [].indexOf;

// Require the "nixfilter" module
nixfilter = require('nixfilter');

// Import/Require the local "utils" module
utils = require('./utils');

// Define the filter and register it on the module
nixfilter.filter(module, {
  description: 'Parse and output the data sent by certain EM4100-125kHz-RFID-Readers connected via UART 9600 8N1 (e.g. RDM630, RDM6300)',
  input_reader: nixfilter.reader.byte(),
  add_arguments: function(argument_parser) {
    argument_parser.addArgument(['--format', '-f'], {
      choices: Object.keys(utils.formats),
      defaultValue: '08H>10D',
      help: 'The output format (default: "08H>10D")'
    });
  },
  setup: function() {
    return this.state = 'read_start';
  },
  on_input: function(input_byte) {
    var checksum, data, i, index, input_character;
    switch (this.state) {
      case 'read_start':
        if (input_byte === 0x02) {
          this.data_string = '';
          this.state = 'read_data';
        }
        break;
      case 'read_data':
        input_character = String.fromCharCode(input_byte);
        if ((indexOf.call('0123456789ABCDEF', input_character) >= 0)) {
          this.data_string += input_character;
          if (this.data_string.length === 12) {
            this.state = 'read_stop';
          }
        } else {
          this.state = 'read_start';
        }
        break;
      case 'read_stop':
        if (input_byte === 0x03) {
          checksum = 0;
          for (index = i = 0; i < 5; index = ++i) {
            checksum ^= utils.get_data_byte_at(this.data_string, index);
          }
          if (checksum === utils.get_data_byte_at(this.data_string, 5)) {
            data = utils.parse_data(this.data_string);
            this.output(data[this.args.format]);
          }
        }
        this.state = 'read_start';
    }
  }
});

//# sourceMappingURL=rdm63.js.map