The RS1 is rated 750Ma and is intended for RED equipment sockets.
The RS2 is rated 1500Ma and can be used with all equipment.

The power plugs are wired the same, as follows;
1 and 6 -- Center tap
2 and 5 -- 9 VAC
3 and 4 -- 9 VAC

****** WARNING WARNING WARNING WARNING WARNING *******

Old RS1 supplies were rated 1500 mA when replacing an old supply ask the power rating on the old transformer to be safe!!!