X-Micro Tech. PCI Adapter fxmicro - Manual (Page 16)

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Aut. Mode: There are three modes available to choose.
Open Authentication – the sender and receiver do not share secret Key for
communication. Instead, each party generates its own key-pairs and asks the other
party to accept it. The key is regenerated when the connection is established every
time.
Shared Authentication – the sender and receiver shares the common key for
data communication, and the key is used for extended length of time.
Auto – depend on the communication to establish, and automatically use the
proper authentication mode.
The following will only be activated to allow for configuration when Encryption is
enabled.
Default Key: select one of the 4 keys to use.
Network Key: enter values to these fields, either in HEX or ASCII formats. You
only have to enter the key that you will use
Key Length: select 64 or 128 bits as the length of the keys
Key Format: ASCII or HEX