4
Baud rate
：
Serial port baud rate: optional range is 1200~115200bps and default is 9600bps. Please set
this parameter to be consistent with the device to which the serial port is connected.
Check Digit
：
It could choose none, odd, even and default is set as none. Please set this parameter to be
consistent with the device to which the serial port is connected.
Stop bit
：
It can choose stop bit 1 or stop bit 2. The default is set as stop bit 1. Please set this
parameter to be consistent with the device to which the serial port is connected.
Receive character interval
：
When receiving message the frame interval detection time can be chose from 1.5t to 200t.
Default is 3.5t. (T is the transmission time of a single character, and it is related with baud
rate). In general, there is no need to change this parameter.
Packet transmission interval
：
Interval time for sending Modbus commands (Delayed time from receiving the slave
response message to sending the next command) can be set from 0ms-65535ms. Default is
0ms. It is recommended to set 100ms and this can prevent connected devices from
communication failure due to slow response.
Timeout processing
：
Read data from slave station. Data processing mode can choose "data clear" or "data
retention" when slave station response is timeout. Default is “Data Hold mode”. This
parameter is only valid for Modbus read command. Please set this value according to actual
needs.
