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Pin outs
RS-232 Pin Assignment
The pin assignment scheme for a 9-pin male connector on a DTE is given below.
PIN 1 : DCD PIN 2 : RXD PIN 3 : TXD PIN 4 : DTR
PIN 5 : GND PIN 6 : DSR PIN 7 : RTS PIN 8 : CTS
PIN 9 : DC 5V
RS-422 Pin Assignment
The pin assignment scheme for a 4-pin RS-422 is given below.
PIN 1 : R-
PIN 2 : R+
1 2 3 4
PIN 3 : T-
PIN 4 : T+