Chapter 4: Using the web interface
Setting up the interfaces
83
Configuring 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).
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