Per the HAI Manual:
CONSOLE SETUP
The console has different operating options that can be setup from the console to the user's preference. If more than one console is being used, it is required that you give each console a different address. You can change the address of a console through the console setup mode.
To enter the console setup mode, simultaneously press and hold the 4 and up arrow (␣) for approximately 1 second. The console will beep 5 times and enter the setup mode. The top line of the display will indicate what you are doing, followed by the current setting. The bottom line will show a menu of your options. To the lower right corner of the display is the direction arrow(s). Where possible, the up (↑), down (↓), and two-headed (↕) arrow characters are shown on the console display to indicate which arrow keys may be pressed at that time. Press the down arrow (Ð) key to advance to the next item. Press the up arrow (␣) key to go back to the previous item.
CONSOLE ADDRESS
If you are installing more than one console, each console must be set to a different address. The default address setting is (1) - this is adequate if only one console is being used. The choices at the bottom are 1-16. When making your choice, choose an address between 1-8, then press the # (pound) key.
