SNM401 Ad Hoc 네트워크 모듈

1. 제품 설명

SNM401 Centerless Ad Hoc Network Module realizes centerless long-distance communication between modules, and adopts the world’s latest LDPC encoding and decoding technology, compared to the RS level used by traditional radio stations The concatenated convolutional code can have a coding gain of 5dB, and at the same time, 통해 “self-relay wireless communication” 과학 기술, it innovatively realizes automatic relay between modules, thereby greatly improving the coverage effect and transmission distance. SNM401 adopts ad-hoc network wireless communication technology, any node can receive and process the same signal forwarded by multiple nodes at the same time, combine these signals forwarded from different nodes, demodulate the original information to the greatest extent possible, and have a larger transmission distance and higher transmission reliability. The wireless communication technology of the ad hoc network does not require routing, and multiple nodes automatically determine whether to start the forwarding according to the received signal quality and field strength, and the relay is upgraded from a multi-hop single-point relay to a multi-hop multi-point relay. The state relay is upgraded to a mesh relay. When any node in the relay network is disconnected from the network, other relay lines in the relay network work normally so that the relay effect is not affected.

2. 제품 특징

◆Operating frequency: 400-500메가 헤르츠

◆Single-hop transmission distance: 3~5Km

◆Dynamic topology convergence: 1MS

◆Transmit power: 1W

◆Receive sensitivity: -127dBm의

◆Working voltage: 3.5-4.5V

◆Signal to noise ratio Threshold: 1dB

◆Channel spacing: 12.5kHz에서

◆Frequency stability: 1ppm

◆Intermodulation: 65dB

◆Encryption: 256AES

◆Spurious response immunity: 75dB

◆Adjacent channel selectivity: 65dB@12.5KHzz

◆Operating temperature: -40～ +85℃

◆Module size: 33.5X42X3.4mm

3. 신청

◆Internet of Things ◆Individual Soldier System ◆Emergency Broadcasting

◆UAV ◆Real-time Remote Control ◆Digital Intercom

◆Emergency Communication ◆Robot ◆Wireless Data Transmission

4. Working Parameters

테이블 1: Operating Parameters Table

매개 변수	정황	최저한의	전형적인	최고	단위
작동 주파수 대역		400		500	메가 헤르츠
작동 온도		-40	25	+85	℃
작동 전압		3.5	4	4.5	V
Transmitting Power			30		dBm의
수신 감도		-130	-127	-125	dBm의
Maximum RF Input Power				+33	dBm의
직렬 포트 전송 속도			115200		bps
sleep current	@EN=0		40		하다
전류를받습니다			160		mA
transmit instantaneous current	@VCC==4V, 1W			1800	mA
transmit average current	@VCC==4V, 1W		600		mA
audio input voltage				1.5	VPP
audio output Impedance			150		옴

노트: 모듈의 작업 조건이 위의 한계 값을 초과하는 경우, 모듈에 영구적인 손상을 줄 수 있습니다..

5. Module pins and definitions

수치 1 SNM401 Pin 도표

Abbreviation	기술
일체 포함	아날로그 입력
에	아날로그 출력
AIO	아날로그 양방향
에서	디지털 입력
~하다	디지털 출력
디오	디지털 양방향
피	힘
지	지면

테이블 3 SNM401 pin definition

핀 번호	핀 이름	유형	기술
1	GND	지	GND
2	개미	AIO	antenna port
3	GND	지	GND
4	GND	지	GND
5	VBAT	피	External 3.5V-4.5V battery or power supply, 4V is recommended
6	VBAT	피
7	GND	지	GND
8	GND	지	GND
9	TX_STATE	~하다	module transmit indication Signal, the high level is transmitting
10	RX_STATE	~하다	module receiving indication signal, the high level is receiving
11	NC		연결되지 않음
12	NC		연결되지 않음
13	GND	지	GND
14	TXD	~하다	serial port data transmitting pin
15	RXD	에서	serial port data receiving pin
16	세트	에서	module Serial port configuration signal, configure parameters when high level, send and receive data when low level
17	EN	에서	module open enable signal, high level open, low level close
18	GND	지	GND
19	PRO1	디오	programmable definition pin
20	PRO2	디오	programmable Definition pin

: The module is regulated by 3.3V LDO inside, and all digital IOs are 3.3V level.

 

6. 패키지 크기

수치 2 SNM401 size chart

수치 3 SNM401 package Figure

7. LAYOUT precautions

1.그만큼SNM401 module works at 400-500메가 헤르츠and the influence of various factors on wireless transceivers should be avoided.

2. 그것 is laid under the module GND, and the traces are extended to the periphery as far as possible.
3. It is recommended to use insulating material to isolate the module mounting position on the substrate, 예를 들면, place a whole piece of in this position

silkscreen

4. Try to take a short and thick power line to the module, the recommended copper line width is80mil, and the decoupling capacitor should be placed as close to the power pin as possible.

8. Software configuration

8.1 매개 변수 구성

Users can obtain and configure parameters through the serial port, the serial port baud rate 이다 115200, the data bit is 8비트, the stop bit is 1비트, and there is no parity bit.

테이블 4 Serial port packet format

Serial port table packet
identification word	길이	명령	instruction reply/reply content
1바이트	1바이트	1바이트	N바이트

8.1.1 Identification word

The identification word is fixed as 0x68.

8.1.2 길이

길이 COFDM 무선 전송 시스템 전송률 계산 명령 + command content/reply content.

8.1.3 명령

및 다른 언어를 사용할 수 있습니다 5 Serial Command-List

기능	명령	함유량	Reply Content
Acquire RF Parameters	0x00	아니	회수(4바이트) +힘(1바이트) +구성 상태(1바이트) +소음(2바이트) +Baseband Version Number(1바이트)
Set RF Parameter	0x01	회수(4바이트) +힘(1바이트)	아니
data relay level	0x0C	아니	data relay level(1바이트)
Set data relay level	0x0D	Data relay level(1바이트)	아니
key to acquire	0x0E	아니	열쇠(32바이트)
set key	0x0f	열쇠(32바이트)	아니
get module version	0x12	아니	module name + version number
module ready	0x55	아니	아니
save configuration	0x66	아니	아니
data receive	0xA2	아니	투명한 데이터 (N바이트)
data send	0xB2	투명한 데이터 (N바이트)	아니

8.1.4 Instruction content/reply content

8.1.4.1 Obtaining RF parameters

회수: 단위입니다 Hz에서, the setting range is ~5000000000, and the precision is 500HHz.

힘:1-고전력 1W,0-저전력 0.5W, the default is high power 1W.

Configuration status: Indicates the radio configuration status,0-uninitialized,1-configuring,2-configured successfully.

Noise Floor: Indicates the current frequency noise intensity, 어느 2 is meaningful

Baseband version number: The upper 4 비트 represent the major version number, and the lower 4 비트 represent the minor version number.

Configuration Packet:0x68 0x01 0x00

Return Packet:0x68 0x0A 0x00 Frequency Power Configuration Status Noise Floor Baseband Version No.

8.1.4.2 Setting RF Parameters

After configuring RF parameters, you must wait for the successful configuration (약 2 초) before the module can enter the setting work correctly state.

Configuration package:0x68 0x06 0x01 Frequency power

return package:0x68 0x01 0x01

8.1.4.3 Obtaining data relay level

SH ad hoc network technology is a simulcast mesh relay method, which does not require routing, which can greatly improve the coverage.number of relay hops N refers to the number of hops that can be relayed during data transmission, and the maximum number of relay hops is 16. With each additional hop, the transmission distance doubles, but the transmission time increases accordingly, as shown in the table below.

테이블 6 Comparison of Relay Levels

릴레이 홉	Transmission Bytes	Transmission Time
N	<36	N*50ms
N	37-72	N*100ms
N	73-108	N*150ms
N	109-144	*200MS
N	145-180	N*250ms
N	181-216	N*300ms
N	217-252	N*350ms
N	253-288	N*400ms

Configuration package: 0x68 0x01 0x0C

Return package: 0x68 0x02 0x0C Data relay level

8.1.4.4 Set data relay level

Configuration package:0x68 0x02 0x0D Data relay level

return packet:0x68 0x01 0x0D

8.1.4.5 Obtain the key

key for communication encryption, the module will automatically discard the voice information and data information whose key is inconsistent with its own key, and the key is all 0.

Configuration Packet:0x68 0x01 0x0E

Return Packet:0x68 0x21 0x0E 키

8.1.4.6 Set Key

Configuration Packet:0x68 0x21 0x0F 키

Return Packet:0x68 0x01 0x0F

8.1.4.7 Get Module Version

Configuration Packet:0x68 0x01 0x12

Return Packet:0x68 0x15 0x12 0x53 0x69 0x6d 0x75 0x6c 0x48 0x6f 0x63 0x32 0x31 0x38 0x5f 0x31 0x31 0x30 0x2e 0x30 0x00 이다“Simulhoc2618_V1.0.0”

8.1.4.8 기준 치수

Return package:0x68 0x01 0x55

8.1.4.9 Save configuration

command to save all settings to 플래시, and the saved configuration will be used directly after power-on.

Configuration package:0x68 0x01 0x66

Return package:0x68 0x01 0x66

8.1.4.10 Data reception

When the 세트 pin is low, the module will transparently transmit the received data package to the user. The length varies according to the actual transparent transmission data length.

Return package:0x68 길이 0xA2 투명한

8.1.4.11 데이터 전송

Only when the 세트 pin is at a low level can data be transmitted, and the data sent in a single transmission does not exceed 36 바이트. The length varies according to the actual transparent transmission data length. If a return packet is received, it indicates that the data transmission failed this time.

Configuration package: 0x68 Length 0xB2 Transparent data

return package: 0x68 0x01 0xB