The default IP address is 192.168.1.254.
a. Restore the factory settings via the management software BlueEyes_II.
b. Use DIP switch to make device restore factory settings according to hardware user manual.
c. The initial user name and password are "admin" for layer 2 switch, serial server and Modbus gateway.
a. The IP address and port number may not be configured correctly.
b. The serial port parameters may not be configured correctly.
c. RS-485 wiring may be abnormal.
find the parity bit is error, none parity is modified to mark parity, communication is normal.
Older version of VSP Manager's RealCom function to receive code algorithm exception, resulting in the serial server to open the WEB function and VSP Manager open RealCom function, the sending and receiving data of the serial port are wrong.
After upgrading the VSP management software, the communication is normal.
Check whether the Ethernet port of the serial server is damaged, if it has been damaged, it will cause Ping test packet loss.
a. MAC address aging.
b. The computer and serial server are not on the same network segment.
After a period of time to see whether the local connection "!" exclamation mark comes or the computer and serial server can be changed on the same network segment.