[Gllug] serial trigger level

Chris Bell chrisbell at overview.demon.co.uk
Wed Dec 3 17:58:08 UTC 2003

On Wed 03 Dec, t.clarke wrote:
> I am speaking totally from memory, but I though 'setserial' or at least some
> other command allowed you to change the trigger level without recompiling
> the kernel.    Alternatively, it might have been some frig that modded a
> flag in the kernel to take effect on reboot.
> Sorry, not very helpful, but if I find anything later and no-one else
> has come up with anything I will re-post.
> What CPU are you using ?  - anything half decent should not be dropping
> serial interrupts unless you are hammering it to death !!
> Tim
   Are you having problems caused by different earths, or low signal levels?
You could try a ferrite common mode filter that clips round the cable, or a
few turns through a larger ferrite core (I use the core from an old TV line
output transformer), otherwise optical isolators or pulse transformers.

Chris Bell

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