ZHIYU ZPB30A1 60W dummy load

input voltage: 12V 0.5A (11-14V)

modes

hold run button at power on

Fun1 - dc load (continue working on voltage alarm)
Fun2 - battery test (stop load at specified voltage)8n

serial

115200 8n1

pins from bottom of the board upwards

G - GND
R - RX
T - TX
L - always low?
F - 50 Khz quare wave
Vc - input voltage