motherboard.
Terminal block definition:
GPIO
J17: 5 pins
Pin No.
Function
Pin 1
AGND
Pin 2
Audio Out
Pin 3
Ext MIC In
Pin 4
RS485 D+
RS485 D-
J18: 5 pins
Function
GND
Alarm In 1
Alarm In 2
Alarm Out
GND
2
Power
J15: 2 pins
Pin No.
Function
Pin 1
DC 12V
Pin 2
GND
