HELIX 7 was not networkable until the HELIX 7 G2N (“N” indicates networking) ...
So .....
G1 = HELIX 9, 10, and 12 are networkable (no “Ns” in G1 model names) ...
G2N = HELIX 7 G2N, 8 G2N, 9 G2N, 10 G2N, 12 G2N (there are both 7 G2 and 7 G2N) ...
G3N = HELIX 7 G3N, 8 G3N, 9 G3N, 10 G3N, 12 G3N
G4N = HELIX 8 G4N, 9 G4N, 10 G4N, 12 G4N, 15 G4N (7 size discontinued) ...
Rickie