The DVP series programmable logic controller communication format can be changed through special registers. In certain applications, the user can forget the communication format, change it and download the program to the PLC, resulting in a disconnection between a computer and the DVP series. When this happens, the user can restore the connection by performing the following steps:

1. Cut power to the DVP series programmable logic controller change the RUN / STOP switch to STOP as shown in the image below.
   
2. Restart the DVP programmable logic controller. At this time, the DVP series communication format will change to the default value: 9600, 7, Even, Stop bit = 1, station number = 1. The user can then change the communication format through WPLSoft software.