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protected function send_cmd($funcode,$address,$data,$manucode='0000000000',$version='0100',$timeout = 10){
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protected function send_cmd($funcode,$address,$data,$manucode='0000000000',$version='0100',$timeout = 10){
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$sendData .= crc16(pack('H*',$sendData));
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$sendData .= crc16(pack('H*',$sendData));
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