– EIA / TIA-232 and EIA / TIA-449
Pinout for EIA / TIA 232 Pins:
2 TS Transmit Data DTE-to-DCE
3 RD Recive Data DCE-to-DTE
4 RTS Request to send DTE signal buffer available
5 CTS Clear to send DCE signal available
6 DSR Data set ready DCE is ready
7 GRD Signal ground
8 CD Carrier detect DCE senses carrier
20 DTR Data term. ready DTE is ready
– V.35 and X.21