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MDEV-868-PRC Datasheet(PDF) 16 Page - Linx Technologies |
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MDEV-868-PRC Datasheet(HTML) 16 Page - Linx Technologies |
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16 / 55 page  – – – – 26 27 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. D UMASK = FF FF FF FF USRCID = FF FF FF FF UDESTID = FF FF FF FF No Key A UMASK = 00 00 00 FF USRCID = 76 54 32 00 UDESTID = 76 54 32 FF Network Key Generate Key D UMASK = FF FF FF FF USRCID = FF FF FF FF UDESTID = FF FF FF FF No Key N UMASK = 00 00 00 FF USRCID = 76 54 32 0 1 UDESTID = 76 54 32 FF Network Key JOIN A UMASK = 00 00 00 FF USRCID = 76 54 32 00 UDESTID = 76 54 32 FF Network Key P UMASK = 00 00 0F FF USRCID = FF FF FF FF UDESTID = FF FF FF FF No Key A UMASK = 00 00 0F FF USRCID = 76 54 30 00 UDESTID = 76 54 3F FF Network Key Generate Key D UMASK = FF FF FF FF USRCID = FF FF FF FF UDESTID = FF FF FF FF No Key N UMASK = 00 00 0F FF USRCID = 76 54 30 0 1 UDESTID = 76 54 3F FF Network Key JOIN A 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 A) B) 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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