The purpose of this application note is to describe the main elements of

an RS-422 and RS-485 system. This application note attempts to cover

enough technical details so that the system designer will have considered all

the important aspects in his data system design. Since both RS-422 and RS-

485 are data transmission systems that use balanced differential signals, it is

appropriate to discuss both systems in the same application note. Throughout

this application note the generic terms of RS-422 and RS-485 will be used to

represent the EIA/TIA-422 and EIA/TIA-485 Standards.-The purpose of this application note is to d escribe the main elements of an RS-422 and RS-48 5 system. This application note attempts to cov er enough technical details so that the system d esigner will have considered all the important aspects in his data system design. Since both RS -422 and RS-485 data transmission systems are not hat use balanced differential signals. it is appropriate to discuss both systems in the same application note. Throughout this applic ation note terms of the generic RS-422 and RS-48 5 will be used to represent the EIA/TIA-422 and E. IA/TIA-485 Standards.