"Also please note that you think that you're sending "ISCP\x00\x00\x00\x10\x00\x00\x00\x08\x01\x00\x00\x00" +"!1PWRQSTN\r" but what you're actually sending is: 49 53 43 50 00 00 00 10 00 00 00 08 01 00 00 00 21 31 50 57 52 51 53 54 4e 0d.

There is no such thing as ASCII in the TCP frame, all you're doing is trying to read as character codes or asking to send the character code. The socket send and onData methods will simply convert before sending or after receiving."

This much I understand...the rest I'm sure I'll figure out.
Now, I think I need to check out the TCP simulator mod. The thread on the subject is terrific.