User Manual for FrSky X4R and X4R-SB Receiver

Quick guide from the manual

This manual covers the setup and operation of the FrSky X4R and X4R-SB receivers. Key procedures include binding the receiver to your transmitter, performing a pre-flight range check, and configuring failsafe settings to ensure model safety in case of signal loss.

Overview and Specifications

The X4R and X4R-SB are full-duplex telemetry receivers operating on 2.4GHz ACCST. Key specifications include:

• Operating Voltage: 4.0 to 10V
• Operating Current: 100mA at 5V
• Weight: 5.8g
• Dimensions: 40 x 22.5 x 6mm
• Range: Full range (greater than 1.5km)
• Features: Smart Port enabled, RSSI PWM output (0-3.3V), firmware upgradeable.

Binding Procedure

Binding uniquely associates the receiver with a transmitter module. Follow these steps:

1. Turn on the transmitter while holding the F/S button on the module (refer to module instructions for switch positions). Release the button; the RED LED on the module will flash.
2. Connect the battery to the receiver while holding the F/S button on the receiver. The LED on the receiver will flash, indicating the binding process is complete.
3. Turn off both the transmitter and the receiver.
4. Turn on the transmitter and connect the battery. The GREEN LED on the receiver indicates it is receiving commands.

Range Check

Perform a pre-flight range check before every flying session:

1. Place the model at least 60cm above non-metal ground.
2. Ensure receiver antennas are separated and not touching the ground.
3. Set the module antenna to a vertical position.
4. Turn on the transmitter and receiver. Press the F/S button on the XJT module for 4 seconds to enter range check mode. The RED LED will turn off, and the GREEN LED will flash rapidly.
5. Walk away from the model while operating controls to confirm normal operation.
6. Press the F/S button on the XJT module for 1-2 seconds to exit range check mode.

Failsafe Configuration

Failsafe moves controls to a preset position if the signal is lost. To set it:

1. Bind the receiver and turn on both the transmitter and receiver.
2. Move the controls to the desired failsafe positions for all channels.
3. Press the F/S button on the receiver briefly (less than 1 second). The Green LED will flash twice to confirm the setting.

To disable failsafe, re-bind the receiver. If failsafe is not set, the receiver will hold the last position before signal loss.

Connecting Smart Port Sensors

The Smart Port allows connection of sensors like the FBVS-01 voltage sensor. Refer to the connection diagrams in the manual for specific wiring. Always use heat shrink tubing on exposed wires to prevent short circuits during flight.