Modbus protocol type
：
It is used to set up the gateway's protocol type of the network between the
communication of the serial port and other connected devices. You can choose Modbus RTU
or Modbus ASCII. Please keep this parameter in accord with the device that is connected to
the serial port.
Baud rate
：
Serial port baud rate: optional range is 1200~115200bps and default is 9600bps, Please
keep this parameter in accord with the device that is connected to the serial port.
Check Digit:
no parity, odd parity, even parity, no default can be chose. Please keep this parameter in
accord with the device that is connected to the serial port.
Stop bit
：
You can choose stop bit 1 or stop bits 2. Default is stop bit 1. Please keep this
parameter in accord with the device that is connected to the serial port.
Receive character interval
：
when receiving packets Frame interval detection time can be chose from 1.5t to 200t.
Default is 3.5t. In general, you don't have 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.It 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"if slave station response timeout. Default is “Data Hold mode”.This parameter is only
valid for Modbus read command. Please set this value according to actual needs.