Moduł sieciowy Ad Hoc SNM401

Spis treści
1. Opis produktu
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, i w tym samym czasie, przez “self-relay wireless communication” technologia, 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. Cechy produktu

◆Operating frequency: 400-500MHz
◆Single-hop transmission distance: 3~5 km
◆Dynamic topology convergence: 1ms
◆Transmit power: 1W
◆Receive sensitivity: -127dBm
◆Working voltage: 3.5-4.5V
◆Signal to noise ratio Threshold: 1dB
◆Channel spacing: 12.5KHz
◆Frequency stability: 1ppm
◆Intermodulation: 65dB
◆Encryption: 256AES
◆Spurious response immunity: 75dB
◆Adjacent channel selectivity: 65dB@12,5 kHz
◆Operating temperature: -40~ +85℃
◆Module size: 33.5X42X3,4mm

3. Podanie
◆Internet of Things ◆Individual Soldier System ◆Emergency Broadcasting
◆UAV ◆Real-time Remote Control ◆Digital Intercom
◆Emergency Communication ◆Robot ◆Wireless Data Transmission

4. Working Parameters
Tabela 1: Operating Parameters Table
| Parametr | Warunki | Minimum | Typowy | Maksymalny | Jednostka |
| Pasmo częstotliwości roboczej | 400 | 500 | MHz | ||
| temperatura robocza | -40 | 25 | +85 | ℃ | |
| Napięcie pracy | 3.5 | 4 | 4.5 | V | |
| Transmitting Power | 30 | dBm | |||
| Odbieranie czułości | -130 | -127 | -125 | dBm | |
| Maximum RF Input Power | +33 | dBm | |||
| szybkość transmisji portu szeregowego | 115200 | bps | |||
| sleep current | @EN=0 | 40 | uA | ||
| odbierać prąd | 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 |
Uwaga: Jeżeli warunki pracy modułu przekraczają powyższe wartości graniczne, może to spowodować trwałe uszkodzenie modułu.
5. Module pins and definitions

Postać 1 SNM401 Pin Diagram
| Abbreviation | Opis |
| Ai | Wejście analogowe |
| DO | Wyjście analogowe |
| AIO | Analogowy dwukierunkowy |
| Z | Wejście cyfrowe |
| DO | Wyjście cyfrowe |
| DIO | Cyfrowy dwukierunkowy |
| P | Moc |
| sol | Grunt |
Tabela 3 SNM401 pin definition
| Pin nr | Nazwa pinu | Rodzaj | Opis |
| 1 | GND | sol | GND |
| 2 | MRÓWKA | AIO | antenna port |
| 3 | GND | sol | GND |
| 4 | GND | sol | GND |
| 5 | VBAT | P | External 3.5V-4.5V battery or power supply, 4V is recommended |
| 6 | VBAT | P | |
| 7 | GND | sol | GND |
| 8 | GND | sol | 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 | Brak połączenia | |
| 12 | NC | Brak połączenia | |
| 13 | GND | sol | GND |
| 14 | TXD | DO | serial port data transmitting pin |
| 15 | RXD | Z | serial port data receiving pin |
| 16 | USTAWIĆ | Z | module Serial port configuration signal, configure parameters when high level, send and receive data when low level |
| 17 | W | Z | module open enable signal, high level open, low level close |
| 18 | GND | sol | GND |
| 19 | PRO1 | DIO | programmable definition pin |
| 20 | PRO2 | DIO | programmable Definition pin |
: The module is regulated by 3.3V LDO inside, and all digital IOs are 3.3V level.
6. Wielkość paczki

Postać 2 SNM401 size chart

Postać 3 SNM401 package Figure
7. LAYOUT precautions
1.PlikSNM401 module works at 400-500MHzand the influence of various factors on wireless transceivers should be avoided.
- To is laid under the module GND, and the traces are extended to the periphery as far as possible.
- It is recommended to use insulating material to isolate the module mounting position on the substrate, na przykład, place a whole piece of in this position
silkscreen
- 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 Konfiguracja parametrów
Users can obtain and configure parameters through the serial port, the serial port baud rate jest 115200, the data bit is 8kawałek, the stop bit is 1kawałek, and there is no parity bit.
Tabela 4 Serial port packet format
| Serial port table packet | |||
| identification word | długość | Rozkaz | instruction reply/reply content |
| 1Bajt | 1Bajt | 1Bajt | Nbajt |
8.1.1 Identification word
The identification word is fixed as 0x68.
8.1.2 Długość
Długość Obliczanie szybkości transmisji systemu transmisji bezprzewodowej COFDM Komenda + command content/reply content.
8.1.3 Rozkaz
nadaje się do montażu wszystkich modeli 5 Serial Command-List
| Funkcjonować | Rozkaz | Zadowolony | Reply Content |
| Acquire RF Parameters | 0x00 | Nie | Częstotliwość(4Bajt) +Moc(1Bajt) +Konfiguracja
Status(1Bajt) +Hałas(2Bajt) +Baseband Version Number(1Bajt) |
| Set RF Parameter | 0x01 | Częstotliwość(4Bajt) +Moc(1Bajt) | Nie |
| data relay level | 0x0C | Nie | data relay level(1Bajt) |
| Set data relay level | 0x0D | Data relay level(1Bajt) | Nie |
| key to acquire | 0x0E | Nie | klucz(32Bajt) |
| set key | 0x0f | klucz(32Bajt) | Nie |
| get module version | 0x12 | Nie | module name + version number |
| module ready | 0x55 | Nie | Nie |
| save configuration | 0x66 | Nie | Nie |
| data receive | 0xA2 | Nie | przejrzyste dane (Nbajt) |
| data send | 0xB2 | przejrzyste dane (Nbajt) | Nie |
8.1.4 Instruction content/reply content
8.1.4.1 Obtaining RF parameters
Częstotliwość: The unit is Hz, the setting range is ~5000000000, and the precision is 500HHz.
Moc:1-Wysoka moc 1W,0-niska moc 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, który 2 is meaningful
Baseband version number: The upper 4 bity represent the major version number, and the lower 4 bity 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 (o 2 sekundy) 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.
Tabela 6 Comparison of Relay Levels
| Przekaźniki przekaźnikowe | Transmission Bytes | Transmission Time |
| n | <36 | N*50 ms |
| n | 37-72 | N*100ms |
| n | 73-108 | N*150 ms |
| n | 109-144 | *200ms |
| n | 145-180 | N*250ms |
| n | 181-216 | N*300ms |
| n | 217-252 | N*350 ms |
| n | 253-288 | N*400 ms |
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 Klawisz
8.1.4.6 Set Key
Configuration Packet:0x68 0x21 0x0F Klawisz
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 jest“Simulhoc2618_V1.0.0”
8.1.4.8 moduł
Return package:0x68 0x01 0x55
8.1.4.9 Save configuration
command to save all settings to Migać, 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 USTAWIĆ 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 Długość 0xA2 Transparent
8.1.4.11 Transmisja danych
Only when the USTAWIĆ pin is at a low level can data be transmitted, and the data sent in a single transmission does not exceed 36 bajty. 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




