DB9 pinout and signals for the PC RS232 connector (COM ports and Serial ports) From 1 is a interface for RS-232 from DB-9S (Female) to RJ11 to telephone cable to RJ11 to DB-9P (Male). It is not known whether this is any type of standard. Note that if this is accidentally connected to a telephone, then one telephone wire is grounded, and TXD and RXD are no connect. 45DB041 AT45DB041 Components datasheet pdf data sheet FREE from Datasheet4U.com Datasheet (data sheet) search for integrated circuits (ic), semiconductors and other electronic components such as resistors, capacitors, transistors and diodes.

USB to Serial Adapter, Benfei USB to RS-232 Male (9-pin) DB9 Serial Cable, Prolific Chipset, Windows 10/8.1/8/7, Mac OS X 10.6 and Above, 24 inch Length 4.4 out of 5 stars 153 $7.45 $ 7 . 45 There are two standard pinout arrangements for the DB-9 connector, DTE and DCE. In most cases a Male will be DTE and a Female will be DCE, but not always. For a basic RS232 connection, you will only need Rx, Tx and Ground. Some equipment may require the additional control pins. Notice how the pin arrangement puts Tx to Rx, DTR to DSR, and RTS ...