[RX mode Conversion function] Latch mode: RX output port is normally at level 0. Press the key once to receive output high level and latch. Press the key again to receive output at level 0. Non-latch mode: press and hold the transmit key to receive high output level, release the key to receive zero level. Port B8 needs to be connected to VDD. [Check code and forbid check code function] TX and RX can only be used with matching codes. RX can only recognize the TX with matching codes successfully. After matching codes are successful, the port of receiving B7 pairs should be disconnected (suspended) to prohibit other TX pairs, so as to prevent other remote controls from controlling your receiving device illegally. The receiving code port does not limit the number of remote control codes (multiple 1 receiving versions) in the allowed code state, allowing several remote control codes to be determined by the owner. If the receiving module (RX) is replaced after code matching, the original remote control (TX) needs to be re-coded. The remote control can only control its own receiving device. If a remote control codes with its own receiving device and then learns other receiving devices and learns successfully, the receiving device is willing to no longer receive the information of the remote control and automatically cleans up the remote control. If you need to use the remote control, you need to re-check the code with the receiving device. The password is a unique 32-bit address, which is sent to the other party when the code is checked. Each transmitting or receiving password can only store a unique password. If the password is checked again, the original password is erased [Test and Use] After the code is successfully matched, press the transmit key b1-B6 to receive port B1-B6 and output high level. The LED will display whether the output function is normal. The reference distance of the open ground is about 50m. The receiving module can provide 2mA output current to drive 3V LED. If the power drive circuit is needed to drive other large loads, the power supply of the module should not be connected backwards, and the voltage should not exceed 3.6V. Otherwise, to damage the device, the module needs to provide stable voltage. The module is a PCB built-in antenna. The antenna must leave the copper coating on the motherboard, otherwise the transmitting and receiving distance will be affected. The module can be welded with row needle wave, but the module cannot be reflow welded.