|  | 1 | 
            
              | No filter |  
              | No filter function is used. |  | 
        
          |  | 2 | 
            
              | Hexadecimal filter |  
              | Hexadecimal filter. |  | 
        
          |  | 3 | 
            
              | ISO 646 filter |  
              | ASCII filter as described in DIS 10126-1. |  | 
        
          |  | 4 | 
            
              | ISO 646 Baudot filter |  
              | Baudot filter as described in DIS 10126-1. |  | 
        
          |  | 5 | 
            
              | UN/EDIFACT EDA filter |  
              | Filter function for UN/EDIFACT character set repertoire A as described in Part 5 of ISO 9735. |  | 
        
          |  | 6 | 
            
              | UN/EDIFACT EDC filter |  
              | Filter function for UN/EDIFACT character set repertoire A as described in Part 5 of ISO 9735. |  | 
        
          |  | 7 | 
            
              | Base 64 filter |  
              | Base 64 filter function as described in RFC 1521. |  | 
        
          |  | ZZZ | 
            
              | Mutually agreed |  
              | Mutually agreed between trading partners. |  |