Ettercap filter

[ghost]

I want to modify a value my register number 12. The start address starts at 62004 what means that I want to modify 62016. How can I modify this filter to make this modification please ?

if (tcp.src == 502 && DATA.data == "\x00\x00") {

DATA.data = "\x00\x01";
msg("Data replaced");
}

Thanks in advance