No Sbus - Jumper SF 810 receiver

[toter]

Cant seem to get into Sbus mode. Instructions not right. Instead of red light I get green or flashing green light. If Sbus mode is set then a plugged in servo, per instruction, will work at the sbus out put (output #8). Numerous attempts but it never seems to happen. Is there a Tx on off or Rx on off sequence that needs to be added. Nor can I get a flashing red light. Can someone give me the steps to get into sbus mode