RS 0 Record Separator Separador de Registro 1997-04-27 control charactercarácter de control 1 Requirement Specification Especificación de Requisitos 1997-04-27 Requirement SpecificationRS 2 Recommended Standard Norma Recomendada 1997-04-27 RS-232RS-232 RS-422RS-422 RS-423RS-423 RS-485RS-485