CNC communication problem

Tried to communicate between the CNC system and the PC, but could not connected. 

Check below steps if could not connect CNC and PC:

1-      The cables are connected properly or not

2-      CNC system parameters for communication is set correct or not?

3-      Check the Baud Rate of the PC COM port is set as the same with CNC or not?

4-      All CNC communication steps are followed correctly or not?

In this case we found the Baud Rates of CNC system and PC are not match, change the baud rate then the problem solved.