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6

Joining a Transmitter

The handheld transmitter is associated with a receiver using the built-in

Join Process. This process configures a star network with the central unit

as the system Administrator. Other units are added to the network as

nodes one at a time. Typically, the handheld transmitter is added as a node

to a module that has been configured as an administrator.

is shown in the Typical Applications section. The transceiver is set as an

Administrator by pressing and holding the PAIR button for 30 seconds.

While the button is held, the MODE_IND line is on. After 30 seconds, the

MODE_IND line repeats a double blink, indicating that the operation has

begun. When the button is released the key and address generation are

complete and the module is an Administrator. A full explanation of this

The handheld transmitter is joined

to an Administrator by pressing and

releasing the PAIR buttons on both

units. The modules automatically

search for each other using a special

protocol. When they find each

other, the administrator sends the

node the encryption key, UMASK

and its network address. The

UDESTID is set to the address of

the administrator. The values are

encrypted using a special factory-

defined key. Once the JOIN process

is complete, the MODE_IND blinks on both units and they now operate

together.

MODE_IND Window

PAIR Button

Figure 8: PAIR Button Access