WAGO-I/O-SYSTEM 757
Configuration
47
757-801 Bluetooth® Module RS-232
Manual
1.0.0
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7
Configuration
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7.1
AT Command Interface
Depending on the application, it may be necessary to change the device
configuration. This can be performed via AT command interface.
Use of this interface requires that you are familiar with the use of serial
ports!
Use of the AT command interface requires that you set up a serial link to the
WSA and that you can transfer any characters from the ASCII character set via
this link. To do this you need a device equipped with the necessary hardware and
software. This documentation does not provide information as to how to set up
and use a serial interface with such a device. The section “Commissioning” does
contain a few examples of this, however.
7.1.1
Using the AT Command Interface
The AT command interface of the WSA employs the question/response principle,
where all processes are represented by the exchange of specific character strings.
Requests to display or change parameter values are sent to the WSA as an AT
command. The WSA processes the command and returns an answer.
A new command may only be executed if the previous one has been processed,
i.e. the WSA has sent a reply and completed with the console character.
Overlapping processing of AT commands is not supported.
A specific syntax is defined for commands and replies; this is described in more
detail in the sections “Basic Structure of an AT Command” and “Basic Structure
of Replies to AT Commands.” A complete description and explanation of all
available commands is given in the section “Reference AT Commands.”
The AT command interface can be used with different external devices. Access
can be provided, for example, by a PLC using a PLC program, or by a Windows
PC using terminal programs such as HTerm, RealTerm or HyperTerminal.
Note on the use of terminal programs
In some terminal programs, the characters entered at the PC in the prompt line are
not displayed.
To simplify entering of AT commands in such a case, you can configure the WSA
using an AT command (
AT SYS ECHO = 1
) such that it reflects or “echoes”
the input.
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