My question involves criminal law for the state of: OREGON

This is in Regards to a DUI. The conviction date was in April, and there was a requirement by the court to pay $50/mo due on the 1st of every month for the fines. A payment was not made in 6 months, due primarily to the fact that he had to pay for his DUII treatment program which was a substantial amount every month. With bills, and the costs of the treatment fees, Enhanced Bench probation fees, he has been unable to afford the $50/mo court fines. The defendant received a letter in the mail stating: "Notice: Show Cause Order", there is a Time and Address, but no courtroom number. The case states that it is for the DUII date.

The Defendant has since paid the court fees up to date after receiving the letter.

Question: What is the Notice of Show Cause Order actually for at this point? Could the defendant go to jail when he appears for this notice?