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Function Description
WAGO-I/O-SYSTEM 750
750-921
Bluetooth
®
Adapter
Manual
Version 2.0.1, applicable from FW Version 02
Bluetooth
®
Standard 2.0 or older
If the external device is a device compliant with
Bluetooth
®
Standard 2.0 or an
older version, the PIN is used for authentication and encryption. A link can be set
up when the same PIN is configured and entered at by both communicating
parties. The PIN for inbound links is required for incoming links (see section
“Reference AT Commands”> … >“AT BTSEC PIN”), as is the PIN for outbound
links for outgoing links (see section “Reference AT Commands”> … >
“AT CON TAR PIN”).
Bluetooth
®
Standard 2.1 or newer
For an external device is a device compliant with
Bluetooth
®
Standard 2.1 or
newer, “Secure Simple Pairing” (SSP) is used for authentication. If the WSA
and/or the external device are configured such that only secure authentication is
permitted, a link can only be established after secure authentication.
To ensure that secure authentication is successful, the
Bluetooth
®
MAC ID for the
external device must be entered in advance in the list of accepted devices in the
WSA configuration (see section “Reference AT Commands”> … >
“AT BTSEC ADEV”). This entry must be made and present at both ends when 2
WSAs are linked. If a link is set up with an external device equipped with a
display and keyboard, a message window is displayed when the link is being set
up. The procedure must be confirmed by the user in this window. If neither the
WSA, nor the external device are configured such that secure authentication is
mandatory, the link is set up without a corresponding entry in the list of accepted
devices. A message window may nevertheless also be displayed in this case at the
other device. This window informs and prompts the user to confirm the setup of
the link.
The figure below illustrates the authentication procedure, based on the settings for
the external device and on the version of the
Bluetooth
®
standard it supports.