-
Notifications
You must be signed in to change notification settings - Fork 0
/
p1-smart-meter-crc16.js
136 lines (108 loc) · 5.69 KB
/
p1-smart-meter-crc16.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/* ==========================================================================
MIT License
Copyright (c) 2020 github/jeroen13
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
==============================================================================
CRC is a CRC16 value calculated over the preceding characters in the data message (from “/” to “!”using the polynomial: x^16+x^15+x^2+1).
CRC16 uses no XOR in, no XOR out and is computed with least significant bit first.
The value is represented as 4 hexadecimal chara-ters (MSB first).
==============================================================================
Tested with ESMR5.0 Telegrams (CTA5ZIV-METER)
========================================================================== */
// CRC-16 ARC Table
var CrcArcTable = new Array(
0x0000,0xC0C1,0xC181,0x0140,0xC301,0x03C0,0x0280,0xC241,0xC601,0x06C0,0x0780,0xC741,0x0500,
0xC5C1,0xC481,0x0440,0xCC01,0x0CC0,0x0D80,0xCD41,0x0F00,0xCFC1,0xCE81,0x0E40,0x0A00,0xCAC1,
0xCB81,0x0B40,0xC901,0x09C0,0x0880,0xC841,0xD801,0x18C0,0x1980,0xD941,0x1B00,0xDBC1,0xDA81,
0x1A40,0x1E00,0xDEC1,0xDF81,0x1F40,0xDD01,0x1DC0,0x1C80,0xDC41,0x1400,0xD4C1,0xD581,0x1540,
0xD701,0x17C0,0x1680,0xD641,0xD201,0x12C0,0x1380,0xD341,0x1100,0xD1C1,0xD081,0x1040,0xF001,
0x30C0,0x3180,0xF141,0x3300,0xF3C1,0xF281,0x3240,0x3600,0xF6C1,0xF781,0x3740,0xF501,0x35C0,
0x3480,0xF441,0x3C00,0xFCC1,0xFD81,0x3D40,0xFF01,0x3FC0,0x3E80,0xFE41,0xFA01,0x3AC0,0x3B80,
0xFB41,0x3900,0xF9C1,0xF881,0x3840,0x2800,0xE8C1,0xE981,0x2940,0xEB01,0x2BC0,0x2A80,0xEA41,
0xEE01,0x2EC0,0x2F80,0xEF41,0x2D00,0xEDC1,0xEC81,0x2C40,0xE401,0x24C0,0x2580,0xE541,0x2700,
0xE7C1,0xE681,0x2640,0x2200,0xE2C1,0xE381,0x2340,0xE101,0x21C0,0x2080,0xE041,0xA001,0x60C0,
0x6180,0xA141,0x6300,0xA3C1,0xA281,0x6240,0x6600,0xA6C1,0xA781,0x6740,0xA501,0x65C0,0x6480,
0xA441,0x6C00,0xACC1,0xAD81,0x6D40,0xAF01,0x6FC0,0x6E80,0xAE41,0xAA01,0x6AC0,0x6B80,0xAB41,
0x6900,0xA9C1,0xA881,0x6840,0x7800,0xB8C1,0xB981,0x7940,0xBB01,0x7BC0,0x7A80,0xBA41,0xBE01,
0x7EC0,0x7F80,0xBF41,0x7D00,0xBDC1,0xBC81,0x7C40,0xB401,0x74C0,0x7580,0xB541,0x7700,0xB7C1,
0xB681,0x7640,0x7200,0xB2C1,0xB381,0x7340,0xB101,0x71C0,0x7080,0xB041,0x5000,0x90C1,0x9181,
0x5140,0x9301,0x53C0,0x5280,0x9241,0x9601,0x56C0,0x5780,0x9741,0x5500,0x95C1,0x9481,0x5440,
0x9C01,0x5CC0,0x5D80,0x9D41,0x5F00,0x9FC1,0x9E81,0x5E40,0x5A00,0x9AC1,0x9B81,0x5B40,0x9901,
0x59C0,0x5880,0x9841,0x8801,0x48C0,0x4980,0x8941,0x4B00,0x8BC1,0x8A81,0x4A40,0x4E00,0x8EC1,
0x8F81,0x4F40,0x8D01,0x4DC0,0x4C80,0x8C41,0x4400,0x84C1,0x8581,0x4540,0x8701,0x47C0,0x4680,
0x8641,0x8201,0x42C0,0x4380,0x8341,0x4100,0x81C1,0x8081,0x4040);
/**
* @sum Calculate CRC16-ARC.
*
* @desc Calculates the CRC16-ARC (CRC16-IBM or CRC16-ANSI with 0xA001).
*
* @param {string} telegram The calculated CRC16-ARC
*
* @return {string} Return the calculated CRC16-ARC
*/
function CrcArcStr(telegram)
{
var n;
var len = telegram.length;
var crc;
crc = 0;
for (n = 0; n < len; n++)
{
c = telegram.charCodeAt(n)
crc = CrcArcTable[(crc ^ c) & 0xFF] ^ ((crc >> 8) & 0xFF);
}
return crc;
}
/**
* @sum Decimal to Hex.
*
* @desc Calculates the HEX value of the CRC16.
*
* @param {number} i The calculated decimal CRC16
*
* @return {string} Return the calculated HEX CRC16
*/
function Dec2Hex16(i) {
return (i+0x10000).toString(16).substr(-4).toUpperCase();
}
/**
* @sum CRC16-IBM/CRC16-ANSI/CRC16-ARC calculator.
*
* @desc Calculate CRC16 with CR+LF or LF check.
*
* @param {string} telegram The P1 Smart Meter Telegram
* @param {bool} crlf Use CR+LF (Windows) or only LF (Unix) for 'newline'
*
* @return {bool} Return telegram CRC equals calculated CRC16.
*/
function calcCRC16(telegram, crlf)
{
// Get the CRC from the telegram
var CRC_Telegram = telegram.substr(telegram.indexOf('!')+1, telegram.length);
CRC_Telegram = CRC_Telegram.replace(/\n\r|\r|\n/g, ""); // Remove leftover 'newline' chars in CRC from telegram
// Some meters have a backslash in their name, replace with "\\" -- UNTESTED --
//telegram = telegram.replace(/\\/g, "\\\\"); -- UNTESTED --
// Formatting according to Windows CR+LF or Unix LF 'new line' characters
telegram = telegram.replace(/(\r\n|\r)/g, "\n"); // Default LF Unix
if (crlf) telegram = telegram.replace(/\n/g, "\r\n"); // true = CR+LF Windows, false = LF Unix
// Remove the CRC from the telegram before calculating the CRC16
telegram = telegram.substr(0, telegram.indexOf('!')+1);
// Calculate the CRC16 from the telegram
var calculatedCRC16 = Dec2Hex16(CrcArcStr(telegram));
// If the CRC from telegram and calculated CRC16 are equal: return true
return (CRC_Telegram == calculatedCRC16) ? true : false;
}