Figure Pin Definition Type Description
Male DB9
1 DCD Input Date carrier detect
2 RX Input Receive data
3 TX Output Transimit data
4 DTR Input Data terminal ready
5 GND_ISO1 Input Isolated ground
6 DSR Input Data set ready
7 RTS Output Request to send
8 CTS Input Clear to send
9 RI Input Ring Input
Application cable:
n RS232 port connect to Male DB9 connector:
As below figure shows, cable require Female-Female cross
connection:
n RS232 port connect to Female DB9 connector:
As below figure shows, cable require Female-Male direct
connection:
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