Chances are you have to send a command to your Adam 4017 to tell it you want to recieve data from multiple channels. Check the manual (
ADAM-4000 User's Manual) on page 4-14 for a list of the command strings. Page 5-14 shows an example of using the string "#21(cr)" to read all the channels, but this appears to be a specific case. Regardless, you'll want to start at the manual. As a precaution, I tried to just open the .pdf and it locked up my browser. I would recommend that you download the manual first, and then open it up.
Good luck!
Logan S.