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MDEV-868-PRC Datasheet(PDF) 38 Page - Linx Technologies |
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MDEV-868-PRC Datasheet(HTML) 38 Page - Linx Technologies |
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38 / 55 page  – – – – 70 71 CMD - Command Register Volatile Address = 0xC7 This volatile write-only register is used to issue special commands. Value V is chosen from among the options in Figure 70. The Join Process Control command allows the software to initiate or stop the secure Join Process. It has the following subcommands. These operations are equivalent to the push-button initiated operation. If the Join Process is started by the serial command (CMD:JOINCTL[2]), push-button operation is ignored until the Join Process finishes. Register write operations are inhibited when the Join Process is active except that a Halt Join command is never inhibited. A Halt Join operation completes before the ACK is sent. Figure 69: HumPRCTM Series Transceiver Command Register Command and Response HumPRCTM Series Command Register Write Command Header Size Escape Address Value 0xFF Size 0xFE 0x47 V Figure 70: HumPRCTM Series Command Register Values When the Join Process is started the KEYRCV flag in the SECOPT register determines whether the module is an administrator or node and whether a key can be sent or changed. The Join Process uses and modifies the non-volatile address registers. After a successful Join, the modified non-volatile registers are copied to the corresponding volatile registers. The Write Key command writes a 16-byte AES key to the selected key register. As with most of the registers, the encryption key has both volatile and non-volatile registers. The volatile register is used during run time, but is lost on a power cycle or reset. When the module powers up, the volatile register is loaded from the non-volatile register. This makes the non-volatile register value the default on power-up. The key value of all zero bytes is reserved as a “no key” indication. Figure 72 shows the command for writing the AES key to the module. If KeyN is 0x01, the command writes to the volatile key register. If it is 0x02, it writes to the non-volatile key register. The Clear Key command sets the selected key to all zeros. Figure 73 shows the structure of this command. If KeyN is 0x01, the command clears the volatile key registers. If it is 0x02, it clears the non-volatile key registers. HumPRCTM Series CMD Values CMD Value Operation 0x10 JOINCTL – Join Process Control 0x11 WRKEY – Write Key 0x12 CLRKEY – Clear Key 0x13 RLDKEY – Reload Key 0x20 0xAA 0xBB NVRESET – Reset non-volatile registers to factory default HumPRCTM Series JOINCTL Subcommand Values Subcommand Value Operation 0 Halt Join Process 1 Generate a random network key and address. This sets the module as the network administrator (SECOPT:KEYRCV=0) 2 Perform the Join Process with another module Figure 71: HumPRCTM Series JOINCTL Subcommand Values Figure 72: HumPRCTM Series Transceiver Write Key Command HumPRCTM Series Write Key Command Write Command Header Size Escape Address Value KeyN Key0 ... Key15 0xFF Size 0xFE 0x47 0x11 KeyN Key0 ... Key15 Figure 73: HumPRCTM Series Transceiver Clear Key Command HumPRCTM Series Clear Key Command Write Command Header Size Escape Address Value KeyN 0xFF 0x04 0xFE 0x47 0x12 KeyN |
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