User Manual

Table Of Contents
136 Appendix
Mailbox Command References
WAGO-I/O-SYSTEM 750
I/O Modules
6.3.5.15 Set Local Authentication Mode (SetLocalAuthenticationMode, 0x50)
With the call up "SetLocalAuthenticationMode", the local authentication
mode of the Bluetooth
®
subsystem is set. If the authentication is activated, the
modules authenticate each other at each connection establishment. This proc-
ess occurs, per Bluetooth
®
standard, under cryptographic safeguards.
If MBX_AUTHENTICATION_LINKKEY is set as the authentication mode,
an individual "Link Key" is calculated from the configured PIN during the
first connection (created from the password). If this key has been generated
once, the modules are considered to be "paired" (connected) and do not need
to repeat mutual authentication with a new connection. If the "Link Key" is
deleted, for example during a restart of the device or via "EraseLocalAuthen-
tication", then the password is requested again in order to calculate the "Link
Key". Accordingly, for external devices, a request to enter the password ap-
pears during the first or renewed authentication. In WAGO modules, the
password is archived in the Bluetooth
®
subsystem and does not have to be re-
entered once it has been correctly created.
In authentication mode MBX_AUTHENTICATION_PIN, an authentication is
performed with the PIN instead of using the "Link Key". Using WAGO mod-
ules, this is performed automatically via saved password; for external devices,
the password must generally be re-entered manually with each connection es-
tablishment.
Note
Authentication only ensures that communication partners detect each other's
identity. Protection from the tapping of data is not guaranteed by an authenti-
cation.
Authentication is the prerequisite for the encryption of data transmission.
Modules can only connect to each other if they have the same settings for
encryption, authentication and password.
Conditions
Mailbox size Operating mode/profile Device role
6 12 18 Config.
Real-
time
Ad hoc Master Slave
Save
config.
Restart
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