SNM401 Ad Hoc Network Module

1. Opis proizvoda

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, through the “self-relay wireless communication” tehnologija, 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. Značajke proizvoda

◆Operating frequency: 400-500MHz

◆Single-hop transmission distance: 3～5Km

◆ Dinamička topologija konvergencije: 1ms

◆Snaga prijenosa: 1W

◆Primanje osjetljivosti: -127dBm

◆ Radni napon: 3.5-4.5V

◆ Prag omjera signal/šum: 1dB

◆ Razmak kanala: 12.5KHz

◆Stabilnost frekvencije: 1ppm

◆Intermodulacija: 65dB

◆Enkripcija: 256AES

◆ Imunitet na lažni odgovor: 75dB

◆ Selektivnost susjednih kanala: 65dB @ 12,5 kHz

◆Radna temperatura: -40～ +85 ℃

◆ Veličina modula: 33.5X42X3,4 mm

3. primjena

◆Internet stvari ◆ Individualni vojnički sustav ◆ Hitno emitiranje

◆UAV ◆Daljinski upravljač u stvarnom vremenu ◆Digitalni interkom

◆ Komunikacija u hitnim slučajevima ◆ Robot ◆ Bežični prijenos podataka

4. Radni parametri

Stol 1: Operating Parameters Table

Parametar	Uvjeti	Minimum	tipičan	Maksimum	Jedinica
Operating Frequency Band		400		500	MHz
Radna temperatura		-40	25	+85	℃
Radni napon		3.5	4	4.5	V
Transmitting Power			30		dBm
Osjetljivost primanja		-130	-127	-125	dBm
Maximum RF Input Power				+33	dBm
brzina prijenosa serijskog porta			115200		bps
sleep current	@ EN=0		40		uA
receive current			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		om

Bilješka: If the working conditions of the module exceed the above limit values, može uzrokovati trajno oštećenje modula.

5. Module pins and definitions

Lik 1 SNM401 Pin Diagram

Abbreviation	Opis
AI	Analogni ulaz
AO	Analog output
AIO	Analog bi-direction
DI	Digital input
DO	Digital output
DIO	Digital bi-direction
P	Vlast
G	Uzemljenje

Stol 3 SNM401 pin definition

Pin NO	Pin name	Tip	Opis
1	GND	G	GND
2	MRAV	AIO	antenna port
3	GND	G	GND
4	GND	G	GND
5	VBAT	P	External 3.5V-4.5V battery or power supply, 4V is recommended
6	VBAT	P
7	GND	G	GND
8	GND	G	GND
9	TX_STATE	DO	module transmit indication Signal, the high level is transmitting
10	RX_STATE	DO	module receiving indication signal, the high level is receiving
11	NC		No connect
12	NC		No connect
13	GND	G	GND
14	TXD	DO	serial port data transmitting pin
15	RXD	DI	serial port data receiving pin
16	SET	DI	module Serial port configuration signal, configure parameters when high level, send and receive data when low level
17	EN	DI	module open enable signal, high level open, niske razine blizu
18	GND	G	GND
19	PRO1	DIO	programibilni pin
20	PRO2	DIO	programibilni Definicijski pin

: Modul je unutar 3.3V LDO reguliran, a svi digitalni IO-ovi su razine 3,3V.

 

6. Veličina Paketa

Lik 2 SNM401 grafikon veličina

Lik 3 SNM401 paket Slika

7. LAYOUT precautions

1.TheSNM401 modul radi na 400-500MHzte treba izbjegavati utjecaj raznih čimbenika na bežične primopredajnike.

2. To se polaže ispod modula GND, a tragovi se protežu na periferiju koliko je to moguće.
3. It is recommended to use insulating material to isolate the module mounting position on the substrate, na primjer, 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 Parameter configuration

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

Stol 4 Serial port packet format

Serial port table packet
identification word	duljina	Command	instruction reply/reply content
1Byte	1Byte	1Byte	NByte

8.1.1 Identification word

The identification word is fixed as 0x68.

8.1.2 dužina

dužina Konfigurabilna RF izlazna snaga command + command content/reply content.

8.1.3 Command

Kada video signal nestane 5 Serial Command-List

Funkcija	Command	Sadržaj	Reply Content
Acquire RF Parameters	0x00	Ne	Frekvencija(4Byte) +Vlast(1Byte) +Konfiguracija Status(1Byte) +Noise(2Byte) +Baseband Version Number(1Byte)
Set RF Parameter	0x01	Frekvencija(4Byte) +Vlast(1Byte)	Ne
data relay level	0x0C	Ne	data relay level(1Byte)
Set data relay level	0x0D	Data relay level(1Byte)	Ne
key to acquire	0x0E	Ne	key(32Byte)
set key	0x0F	key(32Byte)	Ne
get module version	0x12	Ne	module name + version number
module ready	0x55	Ne	Ne
save configuration	0x66	Ne	Ne
data receive	0xA2	Ne	transparent data (NByte)
data send	0xB2	transparent data (NByte)	Ne

8.1.4 Instruction content/reply content

8.1.4.1 Obtaining RF parameters

Frekvencija: The unit is Hz, the setting range is ~5000000000, and the precision is 500HHz.

Vlast:1-high power 1W,0-mala snaga 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, koji 2 is meaningful

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

Configuration Packet:0x68 0x01 0x00

Povratni paket:0x68 0x0A 0x00 Frekvencija Status konfiguracije snage Šum Donji pojas osnovnog pojasa Verzija br.

8.1.4.2 Postavljanje RF parametara

Nakon konfiguriranja RF parametara, morate pričekati uspješnu konfiguraciju (oko 2 sekundi) prije nego što modul može ući u ispravno stanje rada postavki.

Konfiguracijski paket:0x68 0x06 0x01 Snaga frekvencije

povratni paket:0x68 0x01 0x01

8.1.4.3 Dobivanje razine prijenosa podataka

SH ad hoc mrežna tehnologija je simulcast mesh relay metoda, koji ne zahtijeva usmjeravanje, 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.

Stol 6 Comparison of Relay Levels

Relay Hops	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

Konfiguracijski paket: 0x68 0x01 0x0C

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

8.1.4.4 Set data relay level

Konfiguracijski paket: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

Povratni paket:0x68 0x21 0x0E Ključ

8.1.4.6 Set Key

Configuration Packet:0x68 0x21 0x0F Ključ

Povratni paket:0x68 0x01 0x0F

8.1.4.7 Get Module Version

Configuration Packet:0x68 0x01 0x12

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

8.1.4.8 modul

Return package:0x68 0x01 0x55

8.1.4.9 Save configuration

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

Konfiguracijski paket:0x68 0x01 0x66

Return package:0x68 0x01 0x66

8.1.4.10 Data reception

When the SET 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 dužina 0xA2 Transparent

8.1.4.11 Prijenos podataka

Only when the SET pin is at a low level can data be transmitted, and the data sent in a single transmission does not exceed 36 bajtova. 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.

Konfiguracijski paket: 0x68 Length 0xB2 Transparent data

povratni paket: 0x68 0x01 0xB