Please post a link to the datasheet or user-manual for the spektrum sm1000 tx module.
I can't help feeling that your description "I want to plug the sm1000 (wireless dsm tx) to a arduino" is a gross over-simplifcation - but I hope I am wrong.
It would be a big help if you can draw a simple diagram that illustrates how the different parts relate to each other and how the data flows - what direction and which parts are wireless and which are wired. Then post a photo of the drawing.
...R