Chinowing VM21 User manual

VM21 Mesh Radio

User Manual V.202305

Manufacturer: Chinowing Technology Co., Ltd

Address: Room 1106, Building B4, Yunzhi Park, No.138, Xingxin Road, Guangming

Street, Guangming District, Shenzhen City, Guangdong Province, China, 518107

Thank you for choosing our products. Please read these user manual carefully before

use.

Chinowing Technology Co., Ltd

PREFACE

Disclaimer

Thank you for purchasing the VM21 Mesh Radio Link. Please use it in accordance with the

local radio control regulations and read this statement carefully before using it. Once used, it

shall be deemed to endorse and accept all contents of this statement. Please strictly follow

this instruction to install and use the product. The supplier will not bear any legal liability for

any result or loss caused by improper use, installation, final assembly or modification of the

product.

Product Precautions

1. VM21 airborne unit and ground unit need external power supply input DC7.4-24V

(lithium battery 2s-6s), please follow the specification to power the radio.

2. Be sure to install the antenna before powering up to avoid damaging the circuit.

3. Ensure that the antennas are free from obstruction and bending, and keep it as far away

from large metal objects as possible to avoid blocking communication for the above reasons.

4. Please do not disassemble or modify the VM21. If you encounter any problems that

cannot be solved during installation or use, please contact Chinowing Technology Co., Ltd.

5. Make installation with proper distance between electronic devices to minimize

electromagnetic interference.

6. Before use, make sure that all wiring is securely fastened and that all components are

working properly.

7. Please check the surrounding environment to ensure that there is no interference from

other devices in the same frequency band before use, otherwise the data transmission of

VM21 may be seriously affected

8. If you encounter any problem during the installation or use , please contact us or visit our

website at www.chinowing.com for technical support.

Chinowing Technology Co., Ltd

Catalog

Chinowing Technology Co., Ltd .................................................................................................. 1

Product Precautions ...................................................................................................................2

VM21 may be seriously affected .................................................................................................2

Catalog ........................................................................................................................................ 3

1. Product Introduction .............................................................................................................. 4

1.1 Product Introduction and Parameters ............................................................................... 4

1.2 Antenna mounting intent .....................................................................................................5

1.3 Indicators And Interfaces Instruction .................................................................................6

2. Item List ................................................................................................................................. 8

2.1 Main Module .........................................................................................................................8

2.2 Accessories .......................................................................................................................... 8

3. Product Use ...........................................................................................................................9

3.1 Preparation ...........................................................................................................................9

3.2 Serial Port Operation ...........................................................................................................9

3.3VM21 status LED description ......................................................................................... 10

3.4 S-BUS Operation ...............................................................................................................11

3.5 LAN Operation ................................................................................................................... 11

3.6 USB Operation ...................................................................................................................13

3.7 Mesh Operation ................................................................................................................. 14

3. 8 Module Configuration ........................................................................................................ 15

4. Remote Control Fail Safe Protection .................................................................................19

4. 1 Write fail safe protection data ........................................................................................... 19

4.2 Trigger Fail Safe Value ..................................................................................................... 19

4.3 Turn off Fail Safe Value .................................................................................................... 20

4.4 Reset fail-safe data ............................................................................................................20

5. Firmware ..............................................................................................................................20

5.1 Firmware Version View ..................................................................................................... 20

5. 2 Firmware Upgrading .......................................................................................................... 21

6. Common Questions ............................................................................................................ 22

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Chinowing Technology Co., Ltd

1. Product Introduction

1.1 Product Introduction and Parameters

VM21 is mesh radio developed based on LTE, OFDM, MIMO. With dual 10/100 Ethernet

and serial gateway functions, it provides reliable wireless Ethernet bridge functions and

gateway services for most devices. VM21 combines smooth integration with 3-in-1(video,

telemetry, RC) link for a faster, more cost-effective path to system fielding. There are 3

frequencies for choice, 800MHz, 1.4GHz and 2.4GHz. Parameters are as below: It features

compact size, high integration, high sensitivity, which provides great convenience for the

user.

Item

Parameters

Description

Frequency

800MHz

1.4GHz

2.4GHz

806~826MHz

1427.9~ 1467.9MHz

2401.5~2481.5MHz

RF power

-40 – 25dBm

Adjustable

Transmission range

10KM

LOS

S-BUS port

2 S-BUS

Serial port

1 channel

Simplex, baud rate

adjustable

Latency

200-300ms

Power supply voltage

7.4 – 24V

Bandwidth

1.4M – 20M

1.4M\3M\5M\10M\20M

Video input/output

LAN

Connecting IPC or PC

Range of bands and frequency pointsfor each frequency band of the module.

Frequency band

Frequency range

Frequency point range

2.4GHz

2401.5-2481.5MHz

24015-24815

800MHz

806~826MHz

8060-8260

1.4GHz

1427.9-1467.9MHz

14279- 146790

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Chinowing Technology Co., Ltd

1.2 Antenna mounting intent

1.Keep the antenna tightly with the SMA interface;

2.Keep the antenna on the AIR side uncovered, and straight up, or straight down;

3.Keep the antenna on the GND side uncovered, and parallel with the one on the AIR side;

4.Keep metal objects away from the antenna to avoid the communication loss;

5.Use the antenna with high quality;

6.May adjust the antenna’s angle to improve the signal strength;

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Chinowing Technology Co., Ltd

1.3 Indicators And Interfaces Instruction

①Data receiving indicator: light will flicker in the condition of data receiving.

②Data transmitting indicator: light will flicker in the condition of data transmitting.

③RF link connection indicator: When this node is added to the network, the indicator is

steady on.

④Frequency indicator light: showing the current frequency. Green light indicates 800MHz;

red light indicates 1.4GHz and yellow light indicates 2.4GHz.

⑤Power supply indicator: indicating power supply status. Steady ON in the normal power

supply status.

⑥SET button: used for firmware upgrading, serial port baud rate setting, fail-safe settings

Side

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Chinowing Technology Co., Ltd

①TTL port: serial port

②S-BUS1port: SBUS input(ground unit);SBUS output(airborne unit)

③S-BUS2 port: SBUS input(ground unit);SBUS output(airborne unit)

④Power supply port: 7.4-24V

⑤TTL signal indicator: light will flicker when there is data input

⑥SBUS1 indicator:

Ground unit: SBUS1 indicator will flicker when there is data input of SBUS1.

Airborne unit: SBUS1 indicator will flicker when there is data output of SBUS1.

⑦SBUS2 indicator:

Ground unit: SBUS2 indicator will flicker when there is data input of SBUS2.

Airborne unit: SBUS2 indicator will flicker when there is data output of SBUS2.

LAN port: for video input or output

USB port: debugging interface. After the driver is installed, a virtual NIC can be used

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Chinowing Technology Co., Ltd

2. Item List

2.1 Main Module

Ground unit

Airborne unit

2.2 Accessories

Power supply cable*2

（XT30）

LAN-to-4Pin cable*2

GH signal wire

4pin*2

GH signal wire

3pin*4

SMA antenna

(male connector)*4

Fiber-glass epoxy*2

Sucker*2

Package box

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3. Product Use

3.1 Preparation

Power on the airborne unit and ground unit. After the successful connection of the two

modules(signal indicator is steady, this process takes about 1 minute), the device can work

normally, and all parameters have been configured well. If you want to modify the baud rate

of the serial port and the IP address of the network port, please refer to the corresponding

steps.

Note! The products are factory configured and ready for use. Default configuration

parameters.

User name: admin123

Password: admin123

LAN port IP: 192.168.168.12 (airborne unit); 192.168.168. 11(ground unit)

Secret key: 1000

Wireless parameters: frequency: 1.4G; frequency hopping mode: start; bandwidth: 10M;

power: 25dbm

Serial port parameters: baud rate: 115200; 8 data bits; 1 stop bit; no parity;

3.2 Serial Port Operation

The default baud rate of the serial port is 115200. Pls follow the below methods to connect the

flight control and ground station software.

1. Connect flight control to the airborne unit. Pls kindly be noted the line sequence and the

baud rate of the flight control port must be the same as the baud rate of the serial port.

2. Connect the ground station software to the ground unit. Pls kindly be noted that the line

sequence and the baud rate of the port selected by the ground station software must be the

same as the baud rate of the serial port.

Serial port baud rate change

After power-on, long press the SET key (about 2 seconds). When TX and RX light up at the

same time and release it, it indicates the module entering baud rate change state. Short press

the SET key (<1 second) to switch the corresponding baud rate. The corresponding LED

isteady on represents the corresponding baud rate

Demo video, pls refer to：www.chinowing.com

Chinowing Technology Co., Ltd

www.chinowing.com

Chinowing Technology Co., Ltd

Indicator status

Baud rate

Rx continuously ON

9600bps

Tx continuously ON

19200bps

LINK continuously ON

38400bps

BAND continuously ON

57600bps

POWER continuously ON

115200bps

After finishing the setting, long press the SET key (about 2 seconds). When TX and RX light

up at the same time, pls release the key. After releasing, the indicator will return to the normal

working state. After the modification is completed, the baud rate needs to be re-powered to

take effect.

Note: when changing the baud rate, it needs to be the same in airborne unit, ground unit,

flight control, or other devices for normal communication.

3.3VM21 status LED description

Light

state

meaning

TXD

flashing

The module has data sending

Lights

No data is sent by the module

RXD

flashing

The module has data sending

Lights

No data is sent by the module

TTL/RS232

flashing

The serial port has data input

Lights

There is no data input in the serial

port

Blue light

Indicates the TTL level version

green light

Indicates the RS232 level version

S-BUS 1

flashing

S-BUS1 has a signal transmission

Lights

S-BUS1 does not transmit signals

S-BUS 2

flashing

S-BUS2 has a signal transmission

Lights

S-BUS2 does not transmit signals

LAN

flashing

Indicates that the LAN port is connected

LINK

LINK,BAND,POWER

The green light is fully on

High frequency module has strong signal

BAND

green light

Indicates the 800MHz band

red light

Indicates the 1.4GHz band

Yellow light

Indicates the 2.4GHz frequency band

POWER

The lights are always on

Indicates that the power supply to the

module is normal

Lights

Indicates that the power supply to the

module is abnormal

Safe protection data

LINK,BAND,POWER

The green light flashes

Out-of-control protection data is being

exported

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