PYNQ: PYTHON PRODUCTIVITY

It seems that pynq-z1/z2's uart on ardunio could only receive 16 number,How could we change it to another number?

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We could see that I send 19 numbrs to pynq,01 - 02 -… - 10 - 11 - 12(which is 16+2 =18)
But the uart in ardunio could only get the first 16 numbers.
How could I change it, should I rewrite some files in pynq, I search pynq dictory and havn’t find it.
Only with a uart.h file in ardunio’s include dictory.

Should we call it a buffer?