it is a repeating string and the bytes I need are located 9 bytes after symbol 85. Ideally there are 7 bytes I want to know but I have room only for three variables, so I may have to read them one by one every next sycle or use only the first one as it is most important and I only need to ignite a warning LED at certain read value. Now I do it this way:
SERIN PORTB.3,T2400,4000,CLR,[85],VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR

Skipping 9 bytes cost me 45 words of memory which is near 9% of what I have totally

Yes, this chip is very small, but I could not find another one with at least one 15 volt port (regular or open drain) to read and write serial data directly