Suunto D4I User Manual page 58

NOTE: The pairing procedure normally only needs to be done
once. You may need to redo the pairing procedure if another diver
in your group uses the same code.
To assign a new transmitter code:
1. Slowly open the tank valve fully to pressurize the system.
2. Immediately close the tank valve.
3. Quickly depressurize the regulator so that the pressure is
reduced to less than 10 bar (145 psi).
4. Wait about 10 seconds, and slowly open the tank valve again to
re-pressurize above 15 bar (300 psi).
The transmitter assigns a new code automatically. To re-pair the
transmitter with your Suunto D4i:
1. While in a dive mode other than Free or Gauge, keep [DOWN]
pressed to enter the settings.
2. Press [DOWN] to scroll to Tank Press Pairing and press SELECT.
3. Make sure TANK PRESS PAIRING is set to ON and press [SELECT].
4. A code number is displayed. Press [UP] to clear the code.
5. Press [SELECT].
6. Press [MODE] to exit.
With the system pressurized to above 15 bar (300 psi), bring your
Suunto D4i close to the transmitter. When pairing is completed, the
dive computer displays the new code number and the transmitted
tank pressure.
The wireless transmitter indicator is displayed every time a valid
signal is received.
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