FrSky ARCHER PLUS R12+ / SR12+ 12CH Receiver User Manual

1. Introduction and Overview

The FrSky ARCHER PLUS series represents an advancement in receiver technology, offering enhanced performance and versatility for RC enthusiasts. This series includes the R12+ and SR12+ models, both designed to provide reliable communication and advanced features for various applications.

Key improvements in the Archer Plus series include enhanced anti-RF-interference capabilities for more solid RF performance, building upon existing anti-interference measures during spark ignition. These Plus series receivers support both ACCESS and ACCST D16 modes, intelligently matching the RF protocol during the binding process with your radio. A Black-Box function is integrated to preserve basic flight data such as power and signal information.

The R12+ and SR12+ receivers feature 12 configurable channel ports, allowing assignment as PWM, SBUS, FBUS, or S.Port. They support full-range signal strength with dual detachable antennas for optimal reception. The FBUS protocol enables seamless pairing with multiple telemetry devices like XACT servos and ADV Sensors, simplifying setup. Both models also include a socket for an external switch panel to enable a built-in Power Switch function, utilizing standard XT30 plugs for safe and efficient power delivery. Current overload wires on the channel ports further safeguard connected devices.

The SR12+ model further distinguishes itself with a built-in 3-axis gyroscope and 3-axis accelerometer, offering advanced stabilization features and multiple flight modes (Auto-level, Stabilization, Knife-Edge, etc.). It includes 5 additional stabilization channels with pin mapping for various flight modes.

Note: Some advanced features require the support of ACCESS and ETHOS systems.

Figure 1: FrSky ARCHER PLUS R12+ Receiver

Figure 2: FrSky ARCHER PLUS SR12+ Receiver

2. Features

Common Features (R12+ & SR12+)

• Enhanced Anti RF-Interference Capability with more Solid RF Performance
• Smart-Matched ACCESS & ACCST D16 modes
• Basic Black-Box Data Record Function
• Built-in Power Switch Function (Match with Different External Switches - Optional)
• 12 Configurable Channel Ports (PWM, SBUS, FBUS, or S.Port)
  • Note: In ACCST mode, SBUS Out is assigned on Pin11 & S.Port is on Pin12.
• Supports Signal Redundancy (SBUS In)
• Full Control Range with Telemetry (FBUS / S.Port)
• Anti-Interference Capability in the Spark-Ignition Process
• Over-The-Air (OTA) Firmware Update
• External Battery/Device Voltage Detection
• Dual XT30 Power Input Connector
• Compatibility: FrSky 2.4GHz ACCESS / ACCST D16 capable transmitters

SR12+ Specific Features

• Built-in 3-Axis Gyroscope & 3-Axis Accelerometer Sensor
• Multiple Flight Modes (Auto-level, Stabilization, Knife-Edge, etc.)
• Enhanced Stabilization Mode with 5 Additional Stabilization Channels

3. Specifications

4. Setup

4.1 Binding Process

The Archer Plus receivers feature smart-matched ACCESS and ACCST D16 modes. During the binding process with your FrSky 2.4GHz ACCESS / ACCST D16 capable transmitter, the receiver will automatically detect and match the appropriate RF protocol.

1. Ensure your transmitter is powered on and in the correct model memory.
2. Put your transmitter into binding mode (refer to your transmitter's manual for specific instructions).
3. Power on the receiver while holding down the F/S button (or equivalent binding button/procedure for your specific receiver model).
4. The receiver's LED indicator will show the binding status. Once bound, the LED will typically indicate a solid green light.
5. Cycle power to both the transmitter and receiver to confirm successful binding.

4.2 Wiring and Connections

Both R12+ and SR12+ receivers offer 12 configurable channel ports, dual XT30 power input, and an AIN2 port for external voltage detection. Refer to the diagrams below for port identification and general wiring.

Figure 3: FrSky ARCHER PLUS R12+ Receiver Wiring Diagram. This diagram illustrates the layout of the 12 configurable channel ports (1-10 on one side, 11-12 on the other), VBAT, Switch, Upgrade, AIN, and XT30 power input. It also shows dimensions (48.5mm x 33mm x 17.9mm).

Figure 4: FrSky ARCHER PLUS SR12+ Receiver Wiring Diagram. Similar to the R12+, this diagram shows the port layout for the SR12+ model, including the 12 configurable channel ports, VBAT, Switch, Upgrade, AIN, and XT30 power input, along with dimensions.

• Channel Ports (CP1-CP12): These ports can be configured for PWM, SBUS, FBUS, or S.Port.
  • CP1 can also function as SBUS In for signal redundancy.
  • In ACCST mode, SBUS Out is specifically on Pin11 and S.Port on Pin12.
• VBAT: Voltage input for the receiver, typically 3.5V to 10V.
• XT30 Power Input: Dual XT30 connectors provide a robust and safe power input solution. Ensure proper polarity when connecting batteries.
• AIN2: Used for external voltage detection (0-35V) with a 1:10 battery voltage divider ratio.
• Switch Port: Connect an optional external switch panel to enable the built-in power switch function.
• Upgrade Port: Used for firmware updates.

4.3 Antenna Placement

The receivers come with dual detachable IPEX1 antennas. For optimal signal reception and range, ensure the antennas are placed at a 90-degree angle to each other and away from carbon fiber, metal, or other conductive materials that could shield the signal.

5. Operating Instructions

5.1 General Operation

Once bound and correctly wired, the receiver will provide full control range with telemetry data via FBUS or S.Port. Ensure all connections are secure before operation. The integrated Black-Box function will record basic flight data (power and signal related) automatically during use.

5.2 SR12+ Stabilization Features (SR12+ Only)

For the SR12+ model, the built-in 3-axis gyroscope and 3-axis accelerometer enable advanced stabilization. This receiver supports multiple flight modes, including:

• Auto-level: Automatically levels the aircraft.
• Stabilization: Provides general flight stability.
• Knife-Edge: Assists in maintaining knife-edge flight.

The stabilization mode is enhanced with 5 additional stabilization channels, allowing for precise pin mapping to each channel within these flight modes. Configuration of these modes and channels is typically done through your FrSky transmitter's interface (e.g., ETHOS) after binding.

6. Maintenance

6.1 Firmware Updates (OTA)

The Archer Plus receivers support Over-The-Air (OTA) firmware updates. This allows you to update the receiver's firmware wirelessly via your compatible FrSky transmitter, eliminating the need for physical connections to a computer. Refer to your transmitter's manual and FrSky's official website for the latest firmware and detailed OTA update procedures.

Regularly checking for and applying firmware updates is recommended to ensure optimal performance, access to new features, and compatibility with the latest FrSky systems.

7. Troubleshooting

• Loss of Signal / Intermittent Connection:
  • Ensure antennas are correctly positioned (90-degree angle) and not obstructed by carbon fiber or metal.
  • Verify the receiver is properly bound to the transmitter.
  • Check for external RF interference sources. The Archer Plus series has enhanced anti-RF interference capabilities, but extreme conditions can still affect performance.
  • Inspect antenna connectors (IPEX1) for damage or loose connections.
• Power Issues:
  • Confirm the operating voltage is within the specified range (3.5V - 10V).
  • Check XT30 power input connections for secure fit and correct polarity.
  • Utilize the external battery/device voltage detection (AIN2) to monitor power supply.
  • If a connected device is not functioning, check the current overload wires on the channel ports, which are designed to safeguard against overcurrent.
• Incorrect Channel Output:
  • Verify channel port configurations (PWM, SBUS, FBUS, S.Port) in your transmitter settings.
  • Ensure the correct mode (ACCESS or ACCST D16) is selected and matched during binding.
  • For ACCST mode, remember SBUS Out is on Pin11 and S.Port on Pin12.
• Stabilization Malfunction (SR12+ only):
  • Ensure the SR12+ is mounted correctly and calibrated according to your transmitter's stabilization setup guide.
  • Check the configuration of flight modes and stabilization channels in your transmitter.
  • Verify that the necessary ACCESS and ETHOS support is in place for advanced stabilization features.

8. User Tips

• Always perform a range check before flying, especially after any changes to your setup.
• Keep your receiver's firmware updated to benefit from the latest improvements and bug fixes.
• Properly secure all wiring to prevent vibrations from causing loose connections during flight.
• When using the XT30 power input, consider using a high-quality 2S Li-Battery for stable power delivery.
• For SR12+ users, experiment with different stabilization settings in a safe environment to find what works best for your aircraft and flying style.
• Utilize the Black-Box data to analyze flight performance and diagnose potential issues.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the official FrSky website or contact your authorized FrSky dealer. Keep your proof of purchase for warranty claims.