Hi Darrel,

Yet again another simple solution to a problem I have spent way too long on......... Thank you.

I do have the bias resistors on the bus. I read one of your previous posts containing a link to a (Maxim?) datasheet, showing how schottky diodes can be used - very interesting. Now that I have a solution to my initial problem I will work on reducing the current consumption to an acceptable level.

Regards,

Andy