Commissioning; Effect Of Changing Modbus Communication Settings - Siemens SITRANS F M MAGFLO series Operating Manual

Modbus RTU RS-485
4.

Commissioning

4.1 Effect of changing
Modbus communica-
tion settings
8
4. Commissioning
Before communicating with the master, baudrate, node ID and update rate must be selected. This
can be done from the display. Please look in to the transmitter manual to locate the Modbus RTU
menu.
Changing baudrate or framing has effect on the communication as follows:
•
When changed from the menusystem, new settings have effect immediately.
(Same effect as writing to the „ResetCommunication" coil).
•
When changed from the Modbus master, the new settings only have effect after a reset
(PowerUp) of the module - or after writing to the „ResetCommunication" coil.
In both cases the new settings will not have effect until the Modbus driver has responded to any
ongoing Modbus request.
Note
It is recommended NOT to use the default address in a multi-slave network .
It is of great importance to ensure at the time of the procedure of device addressing, that there
is not two devices with the same address. In such a case, an abnormal behaviour of the whole
serial bus can occur, the master being then in the impossibility to communicate with all present
slaves on the bus.
SFIDK.PS.023.D2.02