Is this a new PLC or someone has previously programmed the PLC? If someone has programmed this PLC before you the baud rate may have changed. You can try to use DIP Switch #4 to pause the PLC (see that the PAUSE lights turns on when you turn on DIP Switch #4) and then power cycle the PLC, then it will start up in 9600 bps. Change the TLServer settings to 9600,8,1,n and try to communicate with the PLC using "IR*". If it responds then you can overwrite it with a blank program and then reset without DIP Switch #4 and go back to 38,400,8,1,n.
If you have purchase the PLC from us directly you can call our tech support hotline to walk you through. If you have bought from a distributor please contact the distributor for help.