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RS232 vs ITU V24 Signal Names » History » Revision 4

Revision 3 (laforge, 11/23/2022 07:25 PM) → Revision 4/5 (laforge, 11/23/2022 07:25 PM)

h1. RS232 vs ITU-T V.24 Signal Names 

 There are unfortunately a lot of different terms/names used for serial interfaces, depending on which context/spec you are looking at.    This table provides a mapping of the most common signals between different specs: 

 |_.Common Name|_.RS232|_.ITU-T V.24|_.Direction|_.Description| 
 |GND|AB|102|-|Signal/System Ground| 
 |TXD|BA|103|DTE->DCE|Transmitted data| 
 |RXD|BB|104|DTE<-DCE|Received data| 
 |RTS|CA|105|DTE->DCE|Request to Send| 
 |CTS|CB|106|DTE<-DCE|Clear to Send| 
 |DSR|CC|107|DTE<-DCE|Data Set Ready| 
 |DTR|CD|108/2|DTE->DCE|Data Terminal Ready| 
 |DCD|CF|109|DTE<-DCE|Data Carrier detect| 
 |-|-|113|DTE->DCE|Transmitter signal element timing (DTE source)| 
 |-|-|114|DTE<-DCE|Transmitter signal element timing (DCE source)| 
 |-|-|115|DTE<-DCE|Receiver signal element timing (DCE source)| 
 |RI|CE|125|DTE<-DCE|Ring Indicator| 
 |-|-|133|DTE->DCE|Ready |-|-|133||Ready for receiving| 

 h2. Full ITU V.24 table 

 !v24.png!
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