Industrial
Electronic Devices
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User Manual
Modbus Master / MQTT
Document code: MN67933_ENG Revision 1.001 Page 22 of 36
Figure 4: “Set MQTT Topics” window
MQTT SET TOPIC (Synchronous Mode):
By Pressing the “
MQTT Set Topic
” button from the main window for SW67933 (Fig. 2) the window “Set MQTT Topics” appears (Fig. 4).
This section is used to define the MQTT topics where the converter will publish the data from Modbus and the topic that the converter will
subscribes for writing the data to Modbus.
The means of the fields are:
In the field “
Topic
” the MQTT topic is defined;
If the field “
Retained
” is defined, the retained flag is enabled. The MQTT server will hold the last topic published;
In the field “
QoS
” the QoS level is defined;
In the field “
Template
” the structure of the MQTT payload is defined (only for ‘MQTT Publish’ table). With a double click on it, it is
possible to open a window for editing it;
In the field “
Mnemonic
” a description of the topic is defined.
Note:
It is possible to define a single MQTT topic for subscribe. The payload of the MQTT message must be written with the structure
defined on page 32.
