Get multi-select values in an array

In the documentation it reads:

NOTE 5: for dropdown-multi fields use field_value equal to the items in the label you want to select separated by a comma: ‘,’

How do I use that logic together with this line of code?
$result = set_cimyFieldValue($user_id, $field_name, $field_value);

http://wordpress.org/extend/plugins/cimy-user-extra-fields/