I haven't tried it, but I noted some errors in your command:
A$ = NETCMD$(3,"%0101OF0600" + CHR$(13) + "~")
I think it should be "0F0600" (zero "F" sero six zero zero) and not "OF0600".
In our sample program for i-7018 we have this command that we tested to work:
Z$ = NETCMD$(3,"%01010E0600"+CHR$(13)) +"~"
Hopefully that give a clue.
Note: I modified this post due to some mistake in my earlier reply regarding the position of "~" with respect to CHR$(13). The "~" should be the last character in the string for NETCMD$ in order to use it to communicate with I-70xx.