To connect to the laser machine, you will have to change the IP address of the network adapter to 192.168.1.30 or higher. Leave the DNS mask as 255.255.255.0 and ignore the gateway and DNS servers in place.
Switch to RDWorks, then click on the Port Setting, and double click the IP with ending in 100. Press on TEST and you'll see a message saying Port test succeeded.
Note: It's mandatory to set the IP 30 or higher else the machine won't communicate with the PC.