Industrial
Electronic Devices
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User Manual
Modbus Master / MQTT
Document code: MN67933_ENG Revision 1.001 Page 17 of 36
Figure 3b: “Set Communication
Working Mode” window
Figure 3c: “Set Communication
Modbus Master”
window
W
ORKING
M
ODE
:
This section is used to define the working mode of MQTT side of the converter. It is
possible to define:
Synchronous
: it is possible to read/write the Modbus slaves device
instantaneously, using a specific MQTT payload.
Asynchronous
: Modbus and MQTT are decoupled. The converter manages
by itself the Modbus polling.
M
ODBUS
M
ASTER
:
This section is used to define the main parameters of Modbus line. The means of
the fields are:
In the field “
Serial
” the serial port to use is defined (RS232 or RS485);
In the field “
Baudrate
” the baudrate for the serial line is defined;
In the field “
Parity
” the parity of the serial line is defined;
In the field “
Stop Bits
” the number of Stop Bits of the serial line is defined;
In the field “
TimeOut (ms)
” the maximum time that the converter attends
for the answer from the Slave interrogated is defined;
In the field “
Cyclic Delay (ms)
” the delay (idle time) between two Modbus
requests is defined.
