KVH Industries FB250 User Manual page 140

Chapter 4: Using the web interface
• 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 BGAN network. No transmission is
allowed until the pin is deactivated. You can configure pin 4 to Active low or
Active high.
• Active low (default): Connect pin 4 to ground (< 1.2 V DC) when it should be
activated.
• Active high: Connect pin 4 to ground (< 1.2 V DC). When it should be
activated, disconnect it from ground.
Pin 5/8: Ignition input.
The ignition function can be used to turn on/off the terminal by means of an
external signal. The external signal that triggers the ignition function can be
either positive DC voltage or ground. The ignition function uses pin 5 together
126 Setting up the interfaces