COBHAM explorer 727, User Manual, Page: 94 / 179

Chapter 4: To use the web interface
98-126882-F To set up the interfaces 87
To configure the discrete I/O interface
I/O pins and their functions
The I/O interface on the terminal has 5 configurable I/O pins. You can set up the function of
each pin in the web interface. The default functions of the I/O pins are as follows:
Pin 1: Ringer output.
Pin 1 acts as a built-in switch in the terminal. You can configure Pin 1 to be Normally closed or
Normally open.
• Normally closed (default):
The internal switch at pin 1 is normally closed (pin 1 is connected to ground). When the
terminal is notified of an incoming call from the satellite interface, the switch opens (no
connection to ground). When the call is answered, or the caller gives up and releases the
call, the switch is closed again.
• Normally Open:
The internal switch at pin 1 is normally open (no connection to ground). When the
terminal is notified of an incoming call from the satellite interface, the switch is closed (pin
1 is connected to ground). When the call is answered, or the caller gives up and releases
the call, the switch is opened again.
Pin 2: Warning/Error output.
Pin 2 acts as a built-in switch in the terminal. Pin 2 can be used to provide an external signal
that indicates active warning/error condition(s). You can configure pin 2 to be Normally closed
or Normally open.
• Normally Closed (default):
The internal switch at pin 2 is normally closed (pin 2 is connected to ground). When an
alarm occurs, the switch opens (no connection to ground). The switch is closed again when
all warnings/errors are cleared.
• Normally Open:
The internal switch at pin 2 is normally open (no connection to ground). When an alarm
occurs, the switch is closed (connected to ground). The switch is opened again when all
warnings/errors are cleared.
Pin 3: Mute output.
Pin 3 acts as a built-in switch in the terminal. Pin 3 can be used to provide an external signal
that is active during a phone call. The signal can be used to mute external equipment. You can
configure pin 3 to Normally closed or Normally open.
• Normally Closed (default):
The internal switch at pin 3 is normally closed (pin 3 is connected to ground). During
phone calls, the switch opens (no connection to ground). When the call is ended, the
switch is closed again (connected to ground).
• Normally Open:
The internal switch at pin 3 is normally open (no connection to ground). The switch is
closed (connected to ground) during phone calls. When the call is ended, the switch opens
again (no connection to ground).
Pin 4: Radio silence input.
Activation of this pin causes the system to assume radio silence, i.e. to stop all transmission
from the system. The terminal gracefully closes all open connections, and deregisters from the