By default, for all cards -mode is 0. So you need to specify only cards with mode 1. So it always will look like -mode 1-012.
Here "1" means set mode "1" for cards "012", i.e. for first, second and third cards. No commas, just cards numbers like in "-di" parameter.
Examples:
Want to enable mode "1" for first card? Use "-mode 1-0".
Want to enable mode "1" for second card? Use "-mode 1-1".
Want to enable mode "1" for third card? Use "-mode 1-2".
Want to enable mode "1" for second and third card? Use "-mode 1-12".
Want to enable mode "1" for first and third card? Use "-mode 1-02".
All other (non-specified) cards will use mode 0.
I really don't know how to explain it more.
ok and if the card can't mine eth but only dcr ?