[ATM9] Modular Router Sender into Phytogenic Insolator

I'm new to modular routers, but the sender module seemed straightforward enough.

So... modular router next to a line of Phyto Insolators, and the sender module does not to the little tink sound when I shift-right click the Insolators. Sends fine to a barrel on the other side of the machines. They are set to recieve.

Is there a trick to this, or should I just try another method of distributing phyto-gro?