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User Manual Modbus Master / MQTT
Document code: MN67933_ENG Revision 1.101 Page 33 of 45
MODBUS SET ACCESS (SYNCHRONOUS MODE):
By pressing the “
Modbus Set Access ” button from the main window for SW67933 (Fig. 2) the window “Set Modbus Access” appears.
This section is used to define the Modbus reading requests
M
ODBUS
R
EAD
The means of the fields are:
If the field “ Enable ” is checked, the
Modbus request is enabled;
In the field “ Slave ID ” the address of
the Modbus device to read is defined;
In the field “
Type
” the data type of the
register to read is defined. It is possible
to choose between the following:
o
Coil Status;
o
Input Status
o
Holding Register;
o
Input Register.
In the field “
Address
” the starting address of the register to be read is defined;
In the field “ NPoint ” the number of consecutive registers to be read is defined;
In the field “ Poll Time ” the delay time to make the request is defined;
In the field “ Max Error ” the number of consecutive errors that the converter waits before suspending the request until the next
reboot is defined. If is set to ‘0’ this function is disabled;
If the field “ Swap ” is checked, the data from the Modbus registers are swapped;
If the field “ SwapWord ” is checked, the Modbus words are swapped;
In the field “ Mnemonic ” the description for the request is defined.
Note:
Modbus writing must be made using the specific MQTT payload described on page 40.
Figure 6: “Set Access  Modbus Read”
window