1. Serial mode configuration: disconnect J5 J7 J6, J4 short circuit
Three-wire serial mode, pins: GND DATA CLK LE 3.3V
2. Parallel port C0.5-C16 control mode configuration: J4 J7 disconnect, J5 J6 short circuit
3. Parallel port PUP control mode configuration: J4 J5 disconnect, J7 J6 short circuit