D-sub 9 Connector Pinout
Pinout and diagram of DE9 connector (DB9 connector), commonly used for serial ports (RS-232).
|Pin||SIG.||Signal Name||DTE (PC)|
|1||DCD||Data Carrier Detect||in|
|4||DTR||Data Terminal Ready||out|
|6||DSR||Data Set Ready||in|
|7||RTS||Request to Send||out|
|8||CTS||Clear to Send||in|
The DTE (PC) has the male connector (shown below), and the DCE (peripheral) has the female.
RS-232 Maximum Cable Length
The maximum cable length for RS-232 is 50ft, but in practise depends on baud rate, cable specific capacitance and ambient noise. The table below contains some rules-of-thumb from experiments done by Texas Instruments years ago.
|Baud rate||Maximum range / cable length|
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