The EIAStandard RS-422-A entitled "Electrical characteristics of Balanced Voltage Digital interface circuits" defines the characteristics of RS-422 interface circuits.
Many manufacturers did not follow the standard precisely, or inconsistently interpreted or completely ignored the references to EIA-485.
许多厂家没有完全遵循本标准，有些厂家则完全忽视EIA - 485的规定。
3
Based on high specificity of antigen-antibody reaction, enzyme immunoassay (EIA) identified unknown antigen by antibody labelled with enzyme as standard reagent.