MDEV-868-PRC datasheet(16/55 Pages) LINX

16 / 55 page

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A module becomes a node by joining with an administrator. This is done

by pressing and releasing the PB button 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. This is shown in Figure 22 A.

If UMASK is pre-set when Generate Key is initiated, then the Join Process

uses that mask and sets the address accordingly. This can allow more

nodes in the network. This is shown in Figure 22 B. Likewise, the network

key can be written to the module with the CDI interface. If the PGKEY

bit in the SECOPT register is also set to 0, the Generate Key process

will generate a network address without changing the preset key. Or the

administrator can be completely configured through the CDI and the

Join Process used to associate nodes in the field. This gives the system

designer many options for configuration.

The SECOPT register is used to configure options related to the Join

Process. This allows the OEM to set desired values at the factory and allow

final network configuration in the field. This includes disabling the ability to

change the address, change the key, share the key or perform a factory

reset through the PB line. The built-in security prohibits changing a node to

an administrator without changing the key.

Please see Reference Guide RG-00107, The HumPROTM Series Join

Process for more details and examples of the Join Process.

UMASK = FF FF FF FF

USRCID = FF FF FF FF

UDESTID = FF FF FF FF

No Key

UMASK = 00 00 00 FF

USRCID = 76 54 32 00

UDESTID = 76 54 32 FF

Network Key

Generate Key

UMASK = FF FF FF FF

USRCID = FF FF FF FF

UDESTID = FF FF FF FF

No Key

UMASK = 00 00 00 FF

USRCID = 76 54 32 0

UDESTID = 76 54 32 FF

Network Key

JOIN

UMASK = 00 00 00 FF

USRCID = 76 54 32 00

UDESTID = 76 54 32 FF

Network Key

UMASK = 00 00 0F FF

USRCID = FF FF FF FF

UDESTID = FF FF FF FF

No Key

UMASK = 00 00 0F FF

USRCID = 76 54 30 00

UDESTID = 76 54 3F FF

Network Key

Generate Key

UMASK = FF FF FF FF

USRCID = FF FF FF FF

UDESTID = FF FF FF FF

No Key

UMASK = 00 00 0F FF

USRCID = 76 54 30 0

UDESTID = 76 54 3F FF

Network Key

JOIN

UMASK = 00 00 0F FF

USRCID = 76 54 30 00

UDESTID = 76 54 3F FF

Network Key

Key Generation and Network Join from Factory Default

Key Generation and Network Join from Preset Mask

Figure 22: HumPRCTM Series and HumPRCTM Series Join Process Examples

D = Factory Default

A = Network Administrator

N = Network Node

P = OEM Preset Unit

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