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Simple RS232 to TTL Level Converter

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Transistor Q1 is connected to TxD, and the goal is to borrow a negative voltage connection for Q1. Conditions make this converter to work only half-duplex, so that a negative voltage is always present when transmitting data from TTL level to RS232 level.

Part :
R1 = 1k
R2 = 4K7
R3 = 10K
R4 = 10K
R5 = 1K
D1 = 1N4148
Q1 = BC557
Q2 = BC547
P1 = Port DB9

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