No, there is no single official document. This guide and the Texas Instruments MAX3232 datasheet are the best resources.
: Receive Data (Connects to the TX pin of your Arduino/ESP32). hw-044 datasheet
Connecting RS232 GPS receivers to TTL microcontrollers. No, there is no single official document
No battery is connected to B+/B- (or high impedance contact). OFF No input voltage is detected at IN+/IN-. Customizing the Charge Current hw-044 datasheet
The HW-044 module breaks out five signals through a standard 2.54mm (0.1”) pitch male header. From left to right, with the joystick facing up and the pins pointing down: