DB9 Pinout D-sub 9 Connector Pinout . Pinout and diagram of DE9 connector (DB9 connector), commonly used for serial ports (RS-232). Tech Stuff - RS232 Cables and Wiring Tech Stuff - RS-232 Cables, Wiring and Pinouts. Brief tutorial and pinouts for RS-232, RS422/485, T1/E1 and V. If you want to know more about RS 232 signals then this page may help - but you may also need to lie down in a darkened room afterwards. RS232 Cables | Wiring & Pin Connections | Electronics Notes Wiring and constructional details for RS232 serial data cables: pin connections DB9 (9 way) & DB25 (25 way) . . find out more. RS232, RS422 & RS485 standard DB connector pinout RS232 pinout RS232 pinout standards exist for both DB9 and DB25 connectors as shown below: DB25 SIGNAL DB9 DEFINITION 1 RS-232 Cables, Wiring and Pinouts | PBXDom RS-232 Cables, Wiring and Pinouts. RS-232 standards(TIA-232) are defined by TIA (Telecommunications Industry Association). RS-232 defines both the physical and electrical characteristics of the interface. RS-232 is practically identical to ITU V (signal description and names) and V (electrical).