J9 port - communication port - not used, J10 socket - not used, J11 port - communication port - not used – State Industries GP650YTPDT User Manual
Page 39: J13 socket - blower speed control (vfd), J15 socket - not used, S1 dip switch, On closed off open, Ccb (cont), Op en 1 2 3 4, No vent spare
J9 port - communication port - not used, J10 socket - not used, J11 port - communication port - not used | J13 socket - blower speed control (vfd), J15 socket - not used, S1 dip switch, On closed off open, Ccb (cont), Op en 1 2 3 4, No vent spare | State Industries GP650YTPDT User Manual | Page 39 / 54