WAGO-I/O-SYSTEM 750
Function Description
19
750-921
Bluetooth
®
Adapter
Manual
Version 2.0.1, applicable from FW Version 02
The WSA can be used without previously being configured via the AT command
interface. For this, the WSA can be switched to other special operating modes by
targeted interruption of power supply at specific intervals. In these operating
modes, processes are initiated which adapt the configuration automatically as
required. This includes discovering a further WSA automatically within the
defined range and configuring and establishing a link. A detailed description of
this “AutoConnect” function is given in the section “Operating Modes.”
4.1
Radio Interface
Most of the functions of the WSA require that a radio link exist between it and
other devices in accordance with the
Bluetooth
®
SPP standard.
Refer to the documentation for the external device concerned to learn how a radio
link to the WSA is established from an external device.
You can set up a radio link from the WSA to an SPP-compatible external device
using the AT command interface, or by switching the operating mode.
The WSA offers two SPP services at the
Bluetooth
®
interface:
Table 7: SPP Services
SPP Port Index Designation
Function
1
DATA
Data exchange
2
CONFIG
Configuration
Simultaneous use of both SPP services is supported, meaning two radio links to
one external device, or one radio link each to two different external devices can
exist at the same time.
The “DATA” SPP service is the standard when links are established!
Devices compliant with the
Bluetooth
®
SPP standard can select the service to
which a link is to be set up while the link is being established. Not all devices,
however, offer the user the option of selecting the SPP service. Devices which do
not offer this selection option frequently select the SPP service with the lowest
port index automatically. If a link to the WSA is set up using such a device, the
SPP service “DATA” is used.
4.1.1
SPP Service “DATA”
This feature enables access to the service interface, allowing the WSA to function
as a protocol converter.
Links set up by the WSA to an external device always utilize the “DATA” SPP
service.