KVH Industries FB250, Руководство по установке

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Chapter 4: Hardware interfaces
80 Discrete I/O interface
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
with pin 8 (DC in). Connect the appropriate pin to the ignition switch as
follows:
• Active high (default): Connect pin 5 permanently to Ground. Connect pin 8
to positive DC voltage (10.5-32 V DC) when the ignition is on. To switch off,
disconnect pin 8 from the positive DC voltage.