TXD: Serial transmission 3.3V TTL level
RXD: Serial receiver 3.3V TTL level
CTS: Series flow control, is not supported!
RTS: Series flow control, is not supported!
DC: simulation, burn clock pin.
DD: simulation, data-recognizing results.
RST: Reset Pin, require low level is no less than 5ms to reset.
VCC: Power pin, require DC 3.3V supply current is not less than 100mA
Operating voltage range: 2.0V~3.6V
GND: module in common
LED: Output pin, high level output.
Before connecting:
When the host does not record the slave address, it will be on for 100ms per second;
When the host records the slave address, it lights up for 900ms per second;
The slave is on for 1 second every 2 seconds.
After connection: LED is always on.
Key: Input pin, internal pull down.
This pin is connected to a high level for the master to clear the recorded slave address.