48
Configuration
WAGO-I/O-SYSTEM 757
757-801 Bluetooth® Module RS-232
Manual
1.0.0
7.1.2
Opening the AT Command Interface
There must be a link to the device’s AT command interface in order to use AT
commands, i.e., you must either set up a radio link to the SPP service “CONFIG”,
or you must switch the RS-232 interface to the AT command interface.
Access possible via RS-232 or SPP “CONFIG” service!
Access to the AT command interface via RS-232 and using the SPP “CONFIG”
service are mutually exclusive. If the AT command interface is not yet in use,
access is possible in both ways. However, if access to the AT command interface
has already been granted via RS-232, linking to the SPP service “CONFIG” is no
longer possible. On the other hand, if a link to the SPP service “CONFIG” already
exists and an attempt is made to switch from the RS-232 interface to the AT
command interface, the device will perform a restart. This will discontinue all
existing radio links to SPP services. If a further attempt is made after the restart to
initiate a switchover from RS-232 to the AT command interface, this will be
successful.
To switch the RS-232 interface to the AT command interface, the character string
“
+++
” with preceding and subsequent transmission pause of 1 second must be
sent to the device. As this character string is not an AT command, you may not
use a “carriage return” at the end of input.
RS-232 settings must be identical!
Ensure that the RS-232 settings for the device you wish to use to access the WSA
are identical to those for the module. If you are not sure how the WSA is currently
configured, simply reset it to the factory default settings.
An initial character string does not have to be sent to access the AT command
interface via the SPP service “CONFIG.” The AT command interface is opened
automatically on successful setup of a link to the SPP service “CONFIG.”
If the interface is opened successfully, the WSA outputs a welcome message,
which contains essential device information such as the version status.