responding too slowly and causing communication failures.
Overtime handling
Read the data from the slave station, if the slave station responds to the data processing
mode of timeout, you can choose "data clear" or "data hold". The default "data hold" mode,
this parameter is only valid for Modbus read commands, please set this value according to
actual needs.
Figure 3.33 Set serial port parameters as Modbus RTU/ACII master station
4. Select "COM1" or "COM2" (COM1 in this example), right-click to select Add
Slave, enter "Slave Name", fill in "Slave Station Number", and configure Modbus
function code, the starting address of the slave station data, the number of data, the
starting address of the gateway mapping area, the response timeout time, and
whether the number changes will be sent according to the communication manual
of the slave device.. The station number of the slave station under the same serial
port cannot be the same or the same as the station number of the device, and the
slave station address range is between 1-247. The slave station name under the
same serial port cannot be the same. When a change occurs, the gateway executes
this command once, and this parameter is only valid for write commands. After
completing the settings, click "Save the current mapping table edit".