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Support > Frequently Asked Questions > I’m trying to establish communication with the board SLCD5 connector J7 pin 4 and pin 10 ( RX TX CMOS ). When I connect pins 5 and 6 (RS232) the communication is normal. What should I do?

I’m trying to establish communication with the board SLCD5 connector J7 pin 4 and pin 10 ( RX TX CMOS ). When I connect pins 5 and 6 (RS232) the communication is normal. What should I do?

Connector J7 pin 10 may need a pull-up resistor to your host 3.3V supply and avoid a problem of the SLCD5’s 3.3V supply and your host 3.3V supply being different.