2
Check Digit
：
It could select none, odd, even parity, and none is set as default. Please set this parameter
to be consistent with the device to which the serial port is connected.
Stop bit
：
It could choose stop bit 1 or stop bit 2. And default is 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 could 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.
