serin2 question

Hello

This works
SERIN2 dinp,bmode,8000,main,[wait ("**"),DEC2 dia,DEC2 mes,DEC1 size]

This not work
SERIN2 dinp,bmode,8000,main,[wait ("**"),DEC dia,DEC mes,DEC size]

I must receive numbers in byte size, it can be one digit or two digit
What is the correct way to receive this with serin2???

Thanks in advance

Regards

Pedro