node.js serial port communication

I'm having problem with node.js serial port application. data ([login to view URL]) from the serial port is not coming as single packet It comes randomly split into multiple data packets. --- start <Buffer 01> <Buffer ff 00 1c a5> --- end --- start <Buffer 01> <Buffer ff> <Buffer 00 1c> <Buffer a5> --- end and it actually has to be <Buffer 01 ff 00 1c a5> I've captured the serial port with sniffer and the capture shows data in a single packet (as it should be).