Use Params to specify the database parameters to pass to the InterBase server. 

Database parameters are passed to the server as text in order to establish the connection. For example:

user_name=sysdba
    password=masterkey
    sql_role_name=finance
    lc_ctype=WIN1252

For more information on character sets, refer to 'Character Sets and Collation Orders' in the InterBase Language Reference. 

For other information, refer to the InterBase API Guide.