I'm trying to send and receive data using micro controller connected with external peripherals. Data line is equipped with 15V so I want to send 15V data over 10 metres with 7 data lines at 8KB/s. Can I modify the dedicated pins in RS232 or RS422 cable and can we change voltages to these cables to 15V? For example can I change the default pin operation of RS232 (DB9) to 5 pins act as output, 2 pins act as input and these 7 pins transmit at 8KB/s and remaining 2 pins are +15V & 0V.
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