Ohio Revised Code Title XIII. Commercial Transactions § 1317.03

A retail seller may require a retail buyer to execute and deliver a promissory note to evidence the indebtedness created by a retail installment sale, and, to secure the payment of the indebtedness created by the sale or evidenced by the promissory note or to secure the performance of any other condition of the sale, may require the retail buyer to execute and deliver a security agreement to give the retail seller a security interest in the specific goods which were the subject matter of the retail installment sale. A written instrument required by section 1317.02 of the Revised Code may evidence the security interest.