The SB-EXP2+2 device has three 3 pin servo type connectors.
The connector on the left of the board connects to the EX Bus port of the Jeti receiver (the connector is a double connector, either one can be used).
2 of the connectors on the right are normal PWM servo outputs and the other 2 connectors are EX Bus ports (for connecting other telemetry devices).
The 2 servo outputs can be programmed using the “Jetibox emulator” screen on your transmitter.
You can select which of the 24 possible channels the servos are assigned to and also the failsafe condition (Hold or programmed position).
The SB-EXP2+2 supports Jetibox emulation and it is possible to direct the jetibox emulation downstream to one of the 2 EX Bus ports enabling you to access Jetibox menu on each of the (up to) 2 connected devices.
When done with a device, press and hold both the “up” and the “down” button on the jetibox menu, and the jetibox menu will return to the SB-EXP2+2 menu.
Please observe that the 2 servos connected to the SB-EXP2+2 gets their power from the EX Bus connector from the receiver! You must therefore limit the current drawn or supply power to the servos externally.