Hope this helps ya out..... If you don't have a owner's manual...you can download them from the manufacturer websites.
This is for the Aeris Compumask or Oceanic Datamask HUD:
SET TRANSMITTER (trtr) LINK CODE, information includes:
> Graphic trtr (meaning Transmitter)
> Set Point graphic ON (or OFF), flashing
> Link Code Set Point (Transmitter Serial Number)
Pressing and releasing the S (Side) button momentarily (< 2
seconds) will toggle between ON and OFF.
Pressing and releasing the A (Top) button momentarily (< 2
seconds) will accept the ON/OFF selection.
> If OFF is selected, operation will revert to the SET U screen.
> If ON is selected, the First Digit (left) of the Code will flash.
Pressing and releasing the S (Side) button momentarily and
repeatedly (< 2 seconds each time) will increase the First
Digit from 0 to 9 in increments of 1.
Depressing and holding the S (Side) button will scroll
through the Set Points at a rate of 4 per second.
Pressing and releasing the A (Top) button momentarily (< 2
seconds) will accept the First Digit of the Code and/or
advance to the Second Digit which will be flashing.
Pressing and releasing the S (Side) button momentarily and
repeatedly (< 2 seconds each time) will increase the
Second Digit from 0 to 9 in increments of 1.
Depressing and holding the S (Side) button will scroll
through the Set Points at a rate of 4 per second.
Pressing and releasing the A (Top) button momentarily (< 2 seconds) will accept the
Second Digit of the Code and/or advance to the Third Digit which will be flashing.
Pressing and releasing the S (Side) button repeatedly (< 2 seconds each time) will
increase the Third Digit from 0 to 9 in increments of 1.
Depressing and holding the S (Side) button will scroll through the Set Points at a rate
of 4 per second.
Pressing and releasing the A (Top) button (< 2 seconds) will accept the Third Digit of
the Code and/or advance to the Fourth Digit which will be flashing.
Pressing and releasing the S (Side) button repeatedly (< 2 seconds each time) will
increase the Fourth Digit from 0 to 9 in increments of 1.
Depressing and holding the S (Side) button will scroll through the Set Points at a rate
of 4 per second.
Pressing and releasing the A (Top) button momentarily (< 2 seconds) will accept the
Fourth Digit of the Code and/or advance to the Fifth Digit which will be flashing.
Pressing and releasing the S (Side) button repeatedly (< 2 seconds each time) will
increase the Fifth Digit from 0 to 9 in increments of 1.
Depressing and holding the S (Side) button will scroll through the Set Points at a rate
of 4 per second.
Pressing and releasing the A (Top) button momentarily (< 2 seconds) will accept the
Fifth Digit of the Code, save the setting, and revert to the SET U screen.
If no button is pressed for a period of 2 minutes, operation will revert to the NOR (or
GAU) SURF MAIN screen.