The comm handle will buffer some of the data, so you can work through that in the chart.
Take a moment to read the command reference manual, it will help you a lot.
Here is what the get.src mentions in the manual;
When accepting incoming connections, it is sometimes necessary to determine the IP address from which the connection originated. To accomplish this you would do the following in OptoScript:
Result = SendCommunicationHandleCommand(chComHandle, "get.src" );
Result would be set to the address of the peer. For instance, if the connection originated from 192.168.1.12, the value of Result, in hex, would be:
(C0 = 192, A8 = 168, 01 = 1, 0C = 12)