function crc16_checkout(puchMsg, usDataLen) {
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let crc_reg=0xFFFF;
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let check;
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for(let i =0; i<usDataLen;i++){
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crc_reg = (crc_reg>>8) ^ puchMsg.charCodeAt(i);
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for(let j =0; j<8; j++){
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check = crc_reg & 0x0001;
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crc_reg >>= 1;
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if(check == 0x0001){
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crc_reg ^= 0xA001;
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}
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}
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}
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//return crc_reg.toString(16).toUpperCase();
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return padLeft(crc_reg.toString(16).toUpperCase(),4,'0');
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}
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function padLeft(s, w, pc) {
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if (pc == undefined) {
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pc = '0';
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}
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for (var i = 0, c = w - s.length; i < c; i++) {
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s = pc + s;
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}
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return s;
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};
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// let b = 'QN=20160801085857223;ST=32;CN=1062;PW=100000;MN=010000A8900016F000169DC0;Flag=5;CP=&&RtdInterval=30&&';
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// let a = crc16_checkout(b, b.length);
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// console.log(a.toString(16).toUpperCase());
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module.exports = crc16_checkout;
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