RLINK Handbook

Part 1 Introduction

1.1 Summary

RLINK is a long-distance wireless data link communication module developed by blicube.LLC, supporting Point to Point and Point to Multipoint. Using two RLINK modules to form a pair of data links for mutual communication, when one connected to the device end and the other connected to the computer end. With three or more RLINK modules, it can be used for Point to Multipoint.

Based on bulid-in P900 module, RLINK has the characteristics of high transmission power, high link rate, high receiving sensitivity, etc. The ground-to-air communication distance is up to 30+KM, the transmitting power can reach 1W , besides the module supports wide voltage input (5～55V) and high-speed frequency hopping. The module has the operating temperature range of -40 to 80 degrees, with shell of CNC aviation aluminum alloy materials.

1.2 Technical Specifications

Performance

Item	Specification
Frequency	902-928MHz
Spreading Method	Frequency Hopping
Encryption	Optional(see –AES option)
Range	Up to 60 KM(in theory)
Forward Error Detection	Hamming BCH Golay Reed-Solomon
Error Detection	32 bits of CRC, ARQ
Output Power	100mW-1W（20-30dBm）
Serial Interface	3.3V TTL
Baud Rate	57600（default & changeable）
Link Rate	57.6 – 276 kbps
Sensitivity (@10^-4)	-114 dBm @ 57.6 kbps -112 dBm @ 115.2 kbps -109 dBm @ 172.8 kbps -107 dBm @ 230.4 kbps
Blocking	+/- 1 MHz > 55 dBc +/- 2.5 MHz > 60 dBc +/- 5 MHz > 65 dBc > 930 MHz > 70 dBc < 890 MHz > 70 dBc
Supply Voltage	5～35v
Antenna Interface	SMA
Size	50mm * 38mm * 14mm
Weight	39g
Power	1.5W

1.3 Physical Dimension

The module size is shown in Figure 1.2. The mounting hole is a through hole with a diameter of 3.2, which is suitable for M3 bolt.

size

Part 2 Use Guide

2.1 Interface

The RLINK module has two GH1.25 interfaces, shown in Figure 2 .1, where the left side is the power supply interface, which is recommended to use the provided circuit board for power supply, and the right side is a serial interface.

size

2.2 Default Parameter

RLINK has been configured when you get it. The default link rate is 115 kbps, the boud rate of serial interface is 57600, and the default broadcast mode is Point to Point. If you want to modify the relevant parameters, please refer to Part 3 for custom configurations.

2.3 Communication

Pixhawk Flight Controller
Please connect the RLINK serial interface to controller’s Telem1 or Telem2 interface.
Other Devices
Please follow the interface definition to connect the RLINK serial interface to other device serial interface (RX-TX TX-RX GND-GND), if needed.

2.4 Power Suply

Since output power up to 1W, some controller’s and computer’s interfaces have not the ability to supply such high power, it is recommended strongly that using a separate battery to supply power for RLINK for the stability.

2.5 Ground Station

Connect RLINK(the ground end) to computer as a monitor via a data cable, it can be auto connected when using QGroundControl. While when using Mission Planner as your ground station, it is necessary to select communication port and baud rate as shown in figure 2.2 at first, click CONNECT and then wait for the connection to complete.

Part 3 Configuration

RLINK has been configured at the factory and generally does not require additional configuration. If you need to modify the parameters, you can customize the configuration according to the instructions below.

3.1 Enter Configuration Mode

Connect RLINK(the ground end) to the computer via a data cable at first, make sure the your serial assistant can communicate with RLINK, press and hold the RLINK CONFIG key with a thimble or other sharp object. The RLINK will enter configuration mode when the serial assistant pops up the NO CARRIER 0K prompt and then release CONFIG key.

After entering configuration mode, the configuration can be completed by sending the relevant parameters via the serial assistant (all with OK after successful configuration). Noting that every configuration command needs to be followed by a carriage return.

3.2 Common Commands Reference

Common commands

ATS101: Operator Mode（0 – Master；1 –Repeater；2 – Slave）
ATS133: Network Type（0 – Point to Mutlipoint；1 – Point to Point）
ATS102: Serial Baud Rate（0 - 230400；1 - 115200；2 - 57600；3 - 38400；4 - 28800；5 - 19200；6 - 14400；7 - 9600；8 - 7200；9 - 4800；10 - 3600；11 - 2400；12 - 1200；13 – 600；14 - 300）
ATS103: Wireless Link Rate（0 - 172800；1 - 230400；2 - 276480；3 - 57600；4 - 115200）
ATS108: Output Power（20 - 100；21 - 125；22 - 160；23 - 200；24 - 250；25 - 320；26 - 400；27 - 500；28 - 630；29 - 900；30 -1000）
ATS104: Network Address（1 ~ 4294967295）
ATS105: Unit Address (1 ~ 65535)
ATS140: Destination Address (1 ~ 65535)

Load Factory Default Configuration

AT&F10: Master of Point to Point
AT&F11: Slave of Point to Point
AT&F12: Repeater of Point to Point
AT&F7: Master of Point to Multipoint
AT&F8: Slave of Point to Multipoint 
AT&F9: Repeater of Point to Multipoint

3.3 Point to Point Configuration

Please copy the reference commands to the serial assistant, press enter and then click Send, and the configuration is successful with OK:
Master (ground end) parameter settings： * Note：
ATS105: 1;
ATS140: from 2 to 65535. * Example:
Set to Master mode, Baud rate of 115200, Link rate of 230400, Network address 1234567890, Output power 100mW, Unit address 1, Destination address 2.
Please follow commands below to set RLINK:

AT&F10
ATS101=0
ATS102=1
ATS103=1
ATS104=1234567890
ATS108=20
ATS105=1
ATS140=2
AT&V
AT&W

Slave (remote) parameter settings：

Note：
```
ATS105: from 2 to 65535;
ATS140: 1
```
Example:
Set to Slave mode, Baud rate of 115200, Link rate of 230400, Network address 1234567890, Output power 100mW, Unit address 2, Destination address 1.
Please follow commands below to set RLINK:

AT&F11
ATS101=2
ATS102=1
ATS103=1
ATS104=1234567890
ATS108=20
ATS105=2
ATS140=1
AT&V
AT&W

3.4 Point to Mutlipoint Configuration

EXAMPLE：

Master

AT&F7
ATS102=2
ATS103=4
ATS104=1239
ATS105=1
ATS108=30
AT&W

Slave1

AT&F8
ATS102=2
ATS103=4
ATS104=1239
ATS105=2
ATS108=30
AT&W
ATA

Slave2

AT&F8
ATS102=2
ATS103=4
ATS104=1239
ATS105=2
ATS108=30
AT&W
ATA

Slave3

AT&F8
ATS102=2
ATS103=4
ATS104=1239
ATS105=4
ATS108=30
AT&W
ATA

GCS Settings:

If Point to Mutlipoint Configurations are all ready,

Connect to each vehicle’s autopilot and the master and set the SYSID_THISMAV to a unique number (i.e. “1” for first vehicle, “2” for second vehicle, “3” for third).
On the GCS, reduce data rate to the minimum acceptable value to reduce network traffic.

Refercence for more:

https://ardupilot.org/plane/docs/common-multi-vehicle-flying.html

Part 4 Precautions

RLINK has been configured to be ready to use, if you modify the parameters of RLINK that cannot be used normally, please contact customer service.
This product is a wireless digital transmission link, suitable for unobstructed environment, stable communication distance by the impact of the actual application site.
RLINK has a maximum power of 5W, and if your computer or RLINK is not working properly, check the RLINK power supply.
Remote RLINK and ground-end RLINK can be used interchangeably if used in Point to Point mode, and not interchangeable in Point to Mutlipoint mode.

Part 5 Purchase

5.1 The Link to Purchase

AliExpress: RLINK

5.2 The List of a RLINK Kit

5.3 Express Delivery

Appropriate logistics methods need to be adopted according to the actual situation.

5.4 Wholesale

Wholesale prices vary depending on the quantity of the wholesale, please contact customer service for more details.