Becker AR620X - Page 49

Installation
Electrical Interface
DV14307.03 Issue 04 March 2016 Transceiver Family 620X 49
External Power ON
Pin No.
Pin Name
Direction
Function
J1-25 /EXT_ON IN
External Power ON input
ACTIVE state - closed contact to GND
External Power ON input provides possibility to power "ON" the system by connecting this pin to
ground.
Push-To-Talk (/PTT)
Pin No.
Pin Name
Direction
Function
P1-17 /PTT1 IN
Push-To-Talk key input 1
ACTIVE state - closed contact to GND
J1-5 /PTT2 IN
Push-To-Talk key input 2
ACTIVE state - closed contact to GND
There are two Push-to-Talk inputs available /PTT1 and /PTT2, e.g. one for the pilot and the other for
the co-pilot.
Each input has an internal pull up. While the input is connected to ground a current of less than 1 mA
will flow. The transceiver enters transmit operation, if either one or both inputs are connected to
ground.
According to microphone(s) configuration, signal from particular inputs can or cannot modulate
transmissions.
External Intercom Key (IC)
Pin No.
Pin Name
Direction
Function
P1-7 IC IN
Intercom key input;
ACTIVE state - closed contact to GND
With pin 7 connected to ground the transceiver provides intercom operation. This input has an internal
pull up and is LO active. For installations where automatic intercom operation activates via VOX, a
connection of pin 7 is not necessary. While connected to ground, a current of max. 1 mA will flow.
This discrete input activates the intercom:
• When VOX does not work satisfactorily because of extreme loud cockpit environment
caused e.g. by ambient noise.
• When speaker is enabled in current audio in/out configuration (configuration setup)
Isolation Mode (/ISOL)
Pin No.
Pin Name
Direction
Function
J1-20 /ISOL IN
ISOL input for separation from co-pilot
(passenger)
ACTIVE state - closed contact to GND
AR620X transceiver provides two microphone paths. Each microphone path allows connection of two
individual microphones. Depending on configuration, it is possible to connect pilot and co-pilot
microphones on one path and two passenger microphones on the second.
When /ISOL is active (isolation mode) passengers are isolated from pilots intercom as well as from the
radio transmission, but still can freely communicate with each other.
When /ISOL is inactive both the pilots and the passengers connected to one common intercom circuit.