Filter (exclude) an entire OU or by "$" charatcer

Hello. I just installed Openfire yesterday. Awesome! I have it AD integrated via LDAP. At this moment all users and computer accounts in AD show up in the User Summary page. All my computers are in an OU called PMI-COMPUTERS. How would I go about excluding that OU from the users list in OpenFire. All computer accounts in AD end with $. Would it be easier to exlucde all accounts that end with $?