Is this wrong with MAX232CPE?

[anhnha1]

I used MAX232CPE without any capacitor and power supply is tied.Then I tied the TX of comm port to one pins the the RX of the comm port to another pins of MAX232.Next transmit data to comm port.But i am confusing that I can receive data exactly when TX and RX is tied any pin of MAX232
I have tested MAX232 it is good.Would you tell me is this is true?Or there something wrong here?

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