RS232 Port Pin Assignment

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DB9M RS232 connector has the following pin assignment:

 

Db9m

 

#1

<No connection>

#2

RX (input)

#3

TX (output)

#4

DTR (output)

#5

Ground

#6

DSR (input)

#7

RTS (output)

#8

CTS (input)

#9

<No connection>