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User Manual Modbus TCP Master / MQTT
Document code: MN67935_ENG Revision 1.001 Page 28 of 37
M
ODBUS
W
RITE
The means of the fields are:
If the field “ Enable ” is
checked, the Modbus request
is enabled;
In the field “ Slave IP
Address ” the IP address of
the Modbus TCP device to
read is defined;
In the field “ Port ” the TCP
port used for the
communication is defined;
In the field “ Slave ID ” the
address of the Modbus device
that you have to write is defined;
In the field “ Type ” the data type of the register to write is defined. It is possible to choose between the following:
o
Coil Status;
o
Holding Register.
In the field “ Address ” the start address of the register to be written is defined;
In the field “ NPoint ” the number of consecutive registers to be written is defined;
In the field “ Poll Time ” the delay time to make the request is defined;
If the field “ On Change ” is checked, the converter sends the writing request when the data from MQTT side change value;
If the field “ On CMD ” is checked, the converter sends the writing request when the data from MQTT is received;
In the field “ Max Error ” the number of consecutive errors that the converter waits before suspending the request is defined;
In the field “
Position
” the address of the internal array where taking the information is defined;
In the field “ Start Bit ” the starting bit of the first byte of the field “Position” is defined;
If the field “ Swap ” is checked, the data written the Modbus registers are swapped;
If the field “ Swap Word ” is checked, the Modbus words are swapped;
In the field “ Mnemonic ” the description for the request is defined.
Figure 7b: “Set Access  Modbus Write” window