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Here is a quick way of getting it going...
[{"id":"4f660f011c561be5","type":"inject","z":"af952aeaa20f4f97","name":"validate 00020101021129370016A000000677010111011300660000000005802TH530376463048956","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"validate","payload":"00020101021129370016A000000677010111011300660000000005802TH530376463048956","payloadType":"str","x":1100,"y":960,"wires":[["2dc07650d2be62f3"]]},{"id":"2dc07650d2be62f3","type":"function","z":"af952aeaa20f4f97","name":"","func":"\nif(msg.topic == \"validate\") {\n msg.payload = validateChecksum(msg.payload)\n if (msg.payload) {\n node.status({ fill: \"green\", shape: \"ring\", text: \"CRC valid\" });\n } else {\n node.status({ fill: \"red\", shape: \"ring\", text: \"CRC invalid\" });\n }\n} else if (msg.topic = \"calculate\") {\n msg.payload = calculateChecksum(msg.payload)\n node.status({ fill: \"yellow\", shape: \"ring\", text: msg.payload });\n} else {\n node.status({ fill: \"grey\", shape: \"ring\", text: \"\" });\n return null;\n}\nreturn msg;\n\n\n\nfunction _crc16(data, crc, table) {\n for (const i in data) {\n const o = data.charCodeAt(i);\n crc = ((crc << 8) & 0xff00) ^ table[((crc >>> 8) & 0xff) ^ o];\n }\n return crc & 0xffff;\n}\n\nfunction crc16(data, crc = 0xffff) {\n const CRC16_XMODEM_TABLE = context.get(\"CRC16_XMODEM_TABLE\");\n return _crc16(data, crc, CRC16_XMODEM_TABLE);\n}\n\n/**\n * calculateChecksum\n *\n * @param {String} data string input to calculate checksum\n * @param {Number} checkSumBit Default to 16 bit transform checksum\n */\nfunction calculateChecksum(data, checkSumBit = 16) {\n const result = crc16(data);\n return result.toString(checkSumBit);\n}\n\n/**\n * ValidateChecksum\n * \n * validate long string with default checksum hex format (will use last 4 character)\n * ** this is force to hex usage\n * @param {String} str The long string input (include checksum)\n * @param {Number} checksumBit Default to 16 bit transform checksum\n */\nfunction validateChecksum(str, checksumBit = 16) {\n if (str.length < 5) return false;\n const targetIndex = str.length - 4;\n const headValue = str.slice(0, targetIndex);\n const checkSum = str.slice(targetIndex, str.length).toLowerCase();\n const result = crc16(headValue);\n const newCheckSum = result.toString(checksumBit);\n return checkSum === newCheckSum;\n}\n\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"const CRC16_XMODEM_TABLE = [\n 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,\n 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,\n 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,\n 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,\n 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,\n 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,\n 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,\n 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,\n 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,\n 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,\n 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,\n 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,\n 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,\n 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,\n 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,\n 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,\n 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,\n 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,\n 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,\n 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,\n 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,\n 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,\n 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,\n 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,\n 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,\n 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,\n 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,\n 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,\n 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,\n 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,\n 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,\n 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,\n];\n\ncontext.set(\"CRC16_XMODEM_TABLE\", CRC16_XMODEM_TABLE);\n","finalize":"context.set(\"CRC16_XMODEM_TABLE\", null);","libs":[],"x":1580,"y":880,"wires":[["10fc096fe5e1c8aa"]]},{"id":"10fc096fe5e1c8aa","type":"debug","z":"af952aeaa20f4f97","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":1730,"y":880,"wires":[]},{"id":"3cbef086459c8790","type":"inject","z":"af952aeaa20f4f97","name":"calculate 10020101021129370016A000000677010111011300660000000005802TH53037646304","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"calculate","payload":"10020101021129370016A000000677010111011300660000000005802TH53037646304","payloadType":"str","x":1110,"y":800,"wires":[["2dc07650d2be62f3"]]},{"id":"de3f66c7d89ad155","type":"inject","z":"af952aeaa20f4f97","name":"validate 10020101021129370016A000000677010111011300660000000005802TH530376463048956","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"validate","payload":"10020101021129370016A000000677010111011300660000000005802TH530376463048956","payloadType":"str","x":1100,"y":840,"wires":[["2dc07650d2be62f3"]]},{"id":"d1dd0cb851448f72","type":"inject","z":"af952aeaa20f4f97","name":"calculate 00020101021129370016A000000677010111011300660000000005802TH53037646304","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"calculate","payload":"00020101021129370016A000000677010111011300660000000005802TH53037646304","payloadType":"str","x":1110,"y":920,"wires":[["2dc07650d2be62f3"]]}]