User's Manual

Atlas IP Terminal Installation Manual
Page 23 of 34
3.1.2 GPIO Output Port
The BDU has a dedicated 12-pin phoenix connector to provide GPIO (General Purpose
Input/Output) interface to the external devices.
GPIO Port Pinout
GPIO Port Pin
Signal Name
Descript
ion of Signal
GPIO - 1 IGNITION+ Active high signal of ignition.
Input voltage of +10.8 ~ 31.2 V DC.
GPIO - 2 IGNITION- Return path for “IGNITION+” signal
GPIO - 3 EXT_PANIC+ External Alert Button Input Port.
A momentary pushbutton can be connected across these 2
pins. Shorting those 2 pins will be treated as external panic
alert triggered.
GPIO - 4 EXT_PANIC-
GPIO - 5 REMOTE+ For the connection to Remote ON/ OFF switch.
A momentary pushbutton can be connected across these 2
pins. Long
press of this switch will turn on (if the BDU is off) or off (if
the BDU is on) the
terminal.
GPIO - 6 REMOTE-
GPIO - 7 LED+ Power Indicator.
An LED indicator can be connected across these 2 pins.
The port is
capable of sourcing 25 ~ 30mA current with the LED
forward voltage at
around +3V DC. It will be on when the unit is powered on
and off when the unit
is powered off.
GPIO - 8 LED-
GPIO - 9 RELAY1 External Ringer indicator.
It is a relay output port. When there is an incoming call, the
internal relay
will be energized and these 2 pins will be shorted.
GPIO - 10 RELAY2
GPIO - 11 Reserved Line For future use.
GPIO - 12 Reserved Line For future use.
All wires for the GPIO connector shall use AWG 24 unscreened wire type.
I/O Connector Pinout