Messenger Series - Industrial Control Links

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S159Encryption Mode (AES)AES encryption is only available in models delivered as –AES. This is a factory configuredoption that can only be loaded and enabled at the factory at time of assembly. The use of AESencryption, and export laws governing AES, vary from country to country, contact MicrohardSystems Inc. for more information.AES (Advanced Encryption Standard) provides an extremely strong level of encryption for datafor security of wireless data communication. The use of AES may cause slight degradation ofsystem performance due to the processing requirements of the encoding/decoding process.Up to three levels of AES are available, 128 bit, 192 bit and 256 bit. Only the specific optionsenabled by the factory will be available Once a level of AES is chosen using register S159, theencryption key must be entered. The same AES setting and encryption key must be entered onevery modem in the network.The size of the key is dependant of the level of AES:128bit AES:192bit AES:256bit AES:16 Byte Encryption Key24 Byte Encryption Key32 Byte Encryption KeyThe encryption key can be entered in registers S107 or S177 as they share the same key arrayfor encryption. S107 (Static Mask) is used to enter in up to 32 printable characters (ASCII). Ifusing 128 or 192 bit AES, any character entered after 16 or 24 bytes respectively will beignored. If less than the required number of characters is entered, 0’s will be appended to fillthe encryption key array.To improve the strength of the key, S177 can be used to enter 16-32 bytes (dependant of theAES type) of binary non-printable characters. This register requires the appropriate numberbytes to be entered. In other words, if you are using AES256, S177 requires 32 bytes of data tobe entered. A binary file can be transferred to the modem using a terminal program after aATS177= command has been invoked.Values0 No encryption1 AES 128 bit2 AES 192 bit3 AES 256 bitCopyright © 2012 Industrial Control Links, Inc. All Rights Reserved 42
S177Binary Encryption KeyWhen using AES encryption, S177 can be used to define the encryption key in binary. The typeof AES used defines the minimum number of binary bytes that need to be entered. See S159 formore information.Values (Binary Bytes)16 - 32 Bytes (AES type dependant)S217Protocol TypeFor most applications, the default value of 0 - resulting in transparent operation - will bemaintained in this register. Setting this register to a value of 1 specifies MODBUS operation, inwhich the modem will frame the output data and comply with MODBUS specifications. S217=2configures the modem for DF1 filtering. In this mode, the PLC’s address must match the UnitAddress of the modem. Data not intended for a specific PLC/Modem pairing will be blockedfrom passing through the modem to the attached PLC.Values0 transparent1 MODBUS RTU2 DF1 protocol, full-duplex, with address filteringS232S237Maximum Buffer in StorageValues1-255200Sniff TimeoutThis register applies only to Remote modems. Defines how many hops the unit will sniff forupon expiry of the Sleep Time (S144). The Sniff Timeout (sniff duration) in milliseconds iscalculated as follows:Sniff Timeout=S237 (hops) x hop interval (per S109)Example: S237=20, S109=9 (=20ms)Sniff Timeout = 20 (hops) x 20ms per hop = 400msValues (hops)1-25510The longer the Sniff Timeout (duration), the more assured it is that the Remote modem will‘find’ an upstream unit when it is desired to wake up the system, however more power will beconsumed.Copyright © 2012 Industrial Control Links, Inc. All Rights Reserved 43
Page 1: Messenger SeriesNano Data RadiosTec
Page 6: ContentsCopyright Notice 2Acknowled
Page 10 and 11: Front Panel FeaturesFamiliarization
Page 12 and 13: 3.7"InstallationThis section descri
Page 14 and 15: Power WiringDC PowerMessenger Nano
Page 16 and 17: Rx87654321TxRS-232 and RS-485 Seria
Page 18 and 19: RS-485 Serial CommunicationsRS-485
Page 20 and 21: ConfigurationCommand ModeIn this mo
Page 22 and 23: To use these commands, be sure to p
Page 24 and 25: InIdentificationThe I command retur
Page 26 and 27: Having entered ‘1’, the modem p
Page 28 and 29: S101Operating ModeThe operating mod
Page 31 and 32: S109Hop IntervalThis register is ef
Page 33 and 34: S115Repeat IntervalS115 determines
Page 35 and 36: The default setting is 0: The modem
Page 37 and 38: S143Sleep ModeThis register applies
Page 39 and 40: S145Wake TimeApplies only to Remote
Page 41: Values0 No FEC1 Hamming (7,4)2 Hamm
Page 45 and 46: Radio System InstallationThere are
Page 47 and 48: Installation of Antenna System Comp
Page 49 and 50: Appendix A: AT Command Quick Refere
Page 51 and 52: Appendix B: Settings (S) RegistersT
Page 53 and 54: S141S142S143Repeater Existence0 *no
Page 55 and 56: Copyright © 2012 Industrial Contro

Messenger Series - Industrial Control Links

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