recommended serial Analyzer

Dear friends

I need recommendation of Serial Analyzer (RS-232). My basic requirements are:
- 115 Kbps
- logs modem control lines (RTS, CTS etc)
- able to parse and if available analyze (such as: detects missing parameters etc) PPP and TCP protocol
- able to save log file to PC for long time (days) logging
- able to search data pattern

The brand that I can find so far is STA-232 from and MSB-232 from

Thank you before for your kind attention

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