Manual Documentation Number: ZP9D-115RM-LR-0812
37
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ID (Modem VID) Command
<Networking & Security> The ID
command is used to set/read
the VID (Vendor Identification
Number) of the RF module.
Zlinx Radio Modems must have
matching VIDs in order to
communicate.
KY (AES Encryption Key)
Command
<Networking & Security> The KY
command is used to set the 256-
bit AES (Advanced Encryption
Standard) key for
encrypting/decrypting data.
Once set, the key cannot be
read out of the module by any
means. The entire payload of the
packet is encrypted using the
key and the CRC is computed across the ciphertext. When encryption is enabled,
each packet carries an additional 16 bytes to convey the random CBC Initialization
Vector (IV) to the receiver(s). The KY value may be “0” or any 256-bit value (= 64 hex
digits = 32 bytes). Any other value, including entering ATKY by itself with no
parameters, causes an error.
A module with the wrong key (or no key) will receive encrypted data, but the data
driven out the serial port will be meaningless. Likewise, a module with a key will
receive unencrypted data sent from a module without a key, but the output will be
meaningless. Because CBC mode is utilized, repetitive data appears differently in
different transmissions due to the randomly-generated IV.
AT Command: ATID
Binary Command: 0x27 (39 decimal)
Parameter Range: 0x11 - 0x7FFF (user-settable)
0 - 0x10 & 0x8000 - 0xFFFF (factory-set)
Default Parameter Value: 0x3332 (13106d)
Number of bytes returned: 2
AT Command: ATKY
Binary Command: 0x3C (60 decimal)
Parameter Range: 0 - (any other 64-digit hex
valid key)
Default Parameter Value: 0 (disabled)
Number of bytes returned: 2
Number Base: Always Hexadecimal
