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Electronics => Beginners => Topic started by: Nautiluso on January 01, 2025, 04:52:43 pm

Title: Serial Decode Error on Rigol DHO812
Post by: Nautiluso on January 01, 2025, 04:52:43 pm

Decoding a 1200 baud 7 bit Event 1 stop bit serial protocol via a Rigol DHO812 gives me an "S" and a "P". I guess they are errors but does anyone know exactly what they mean? Thanks and best wishes for 2025!

Title: Re: Serial Decode Error on Rigol DHO812
Post by: mwb1100 on January 01, 2025, 06:26:14 pm

The P indicates a parity error and the S indicates a stop bit error.

I think you want 8n1 setting (8 data bits).

Title: Re: Serial Decode Error on Rigol DHO812
Post by: Nautiluso on January 02, 2025, 11:37:43 am

I did various tests - the protocol is 8E1, I had never seen one. Now everything works thanks. :-+

Title: Re: Serial Decode Error on Rigol DHO812
Post by: mwb1100 on January 02, 2025, 06:53:33 pm

Quote from: Nautiluso on January 02, 2025, 11:37:43 am

the protocol is 8E1, I had never seen one.

I can see that now in the screenshot.  I don't think I have ever come across a device actually using parity in RS232 comms; I can't recall ever having used anything other than 8n1.