Annex 2: Send Information With "Qmodmaster" For Modbus Tcp And Modbus Rtu - Ditel DN109/NB Manual Tecnico

TECHNICAL MANUAL
LARGE DISPLAYS DN109/NB - DN119/NB - DN189/NB - DN129/NB
ANNEX 2: Send information with "QModMaster" for MODBUS
TCP and MODBUS RTU
When communicating over MODBUS using QModMaster there are few differences to work over
RTU or TCP.
First of all, check that the connection settings are correct. These settings vary between RTU or
TCP, but in both cases, they must be related to the information established in the device's web
server. In MODBUS TCP, the port is always 502.
Next, you have to configure the "Unit ID" and the "Scan Rate", if there is only one device
connected, an image like the previous one will be displayed.
At this point, the type of frame to be sent will be set according to the value to be displayed,
following the protocols explained in
- Function Code: You must select the type of action you want. Either read or write to
registers or Coils. All the possibilities are specified in the drop-down menu, as well as
the function number that corresponds to them.
- Start Address: Indicates the first register to be read from or written to. It is
recommended to keep its value in decimal.
- Number of Registers: You must indicate how many registers you want to work with.
ANNEX II
Fig. 113: QModMaster.
section 24.2. The parameters to configure are the following: