3
3.4.1.3.3.Double-click "COM1", "COM2" , "COM3" "COM4"or
right-click "COM1", "COM2", "COM3" "COM4" .
And click "Serial Properties" to bring up the "Configure serial" window. Set up the
communication parameters, then click the "OK" to save and return.
The meaning of each parameter is as follows
：
Operating mode
：
It is used to set up gateway as master station or slave station in the network.
Default is set as master mode.
Modbus protocol type
：
It is used to set up the gateway protocol type of the network between the communication of
the serial port and other connected devices.
It can choose either Modbus-RTU or Modbus-ASCII. Please set this parameter to be
consistent with the device to which the serial port is connected.
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
