SNM401 Ad Hoc Network Module
目次
1. 製品説明
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” テクノロジー, 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. 製品の特徴
◆Operating frequency: 400-500メガヘルツ
◆Single-hop transmission distance: 3～5Km
◆Dynamic topology convergence: 1ミズ
◆Transmit power: 1W
◆Receive sensitivity: -127dBmの
◆Working voltage: 3.5-4.5V
◆Signal to noise ratio Threshold: 1デシベル
◆Channel spacing: 12.5KHz
◆Frequency stability: 1ppm
◆Intermodulation: 65デシベル
◆Encryption: 256AES
◆Spurious response immunity: 75デシベル
◆Adjacent channel selectivity: 65[email protected]
◆Operating temperature: -40～ +85℃
◆Module size: 33.5X42X3.4mm
3. 応用
◆Internet of Things ◆Individual Soldier System ◆Emergency Broadcasting
◆UAV ◆Real-time Remote Control ◆Digital Intercom
◆Emergency Communication ◆Robot ◆Wireless Data Transmission
4. Working Parameters
Table 1: Operating Parameters Table
| パラメータ | 条件 | Minimum | Typical | 最大 | Unit |
| Operating Frequency Band | 400 | 500 | メガヘルツ | ||
| 動作温度 | -40 | 25 | +85 | ℃ | |
| 動作電圧 | 3.5 | 4 | 4.5 | V | |
| Transmitting Power | 30 | dBmの | |||
| Receiving Sensitivity | -130 | -127 | -125 | dBmの | |
| Maximum RF Input Power | +33 | dBmの | |||
| serial port baud rate | 115200 | bps | |||
| sleep current | @ EN=0 | 40 | uA | ||
| receive current | 160 | ミリアンペア | |||
| transmit instantaneous current | @VCC==4V, 1W | 1800 | ミリアンペア | ||
| transmit average current | @VCC==4V, 1W | 600 | ミリアンペア | ||
| audio input voltage | 1.5 | VPP | |||
| audio output Impedance | 150 | Ohm |
注意: If the working conditions of the module exceed the above limit values, it may cause permanent damage to the module.
5. Module pins and definitions
Figure 1 SNM401 Pin Diagram
| Abbreviation | 説明 |
| AI | Analog input |
| AO | Analog output |
| AIO | Analog bi-direction |
| DI | Digital input |
| DO | Digital output |
| DIO | Digital bi-direction |
| P | 力 |
| G | 地面 |
Table 3 SNM401 pin definition
| Pin NO | Pin name | タイプ | 説明 |
| 1 | GND | G | GND |
| 2 | ANT | 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 | ノースカロライナ州 | No connect | |
| 12 | ノースカロライナ州 | 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, low level close |
| 18 | GND | G | 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. Package size
Figure 2 SNM401 size chart
Figure 3 SNM401 package Figure
7. LAYOUT precautions
1.ザ・SNM401 module works at 400-500メガヘルツand the influence of various factors on wireless transceivers should be avoided.
- It 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, 例えば, 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 Parameter configuration
Users can obtain and configure parameters through the serial port, the serial port baud rate is 115200, the data bit is 8ビット, the stop bit is 1ビット, and there is no parity bit.
Table 4 Serial port packet format
| Serial port table packet | |||
| identification word | 長さ | Command | instruction reply/reply content |
| 1Byte | 1Byte | 1Byte | NByte |
8.1.1 Identification word
The identification word is fixed as 0x68.
8.1.2 Length
Length = command + command content/reply content.
8.1.3 Command
List 5 Serial Command-List
| 関数 | Command | Content | Reply Content |
| Acquire RF Parameters | 0x00 | いいえ | 周波数(4Byte) +力(1Byte) +コンフィギュレーション
状態(1Byte) +Noise(2Byte) +Baseband Version Number(1Byte) |
| Set RF Parameter | 0x01 | 周波数(4Byte) +力(1Byte) | いいえ |
| data relay level | 0x0C | いいえ | data relay level(1Byte) |
| Set data relay level | 0x0D | Data relay level(1Byte) | いいえ |
| key to acquire | 0x0E | いいえ | key(32Byte) |
| set key | 0x0F | key(32Byte) | no |
| get module version | 0x12 | no | module name + version number |
| module ready | 0x55 | no | no |
| save configuration | 0x66 | no | no |
| data receive | 0xA2 | no | transparent data (NByte) |
| data send | 0xB2 | transparent data (NByte) | no |
8.1.4 Instruction content/reply content
8.1.4.1 Obtaining RF parameters
周波数: The unit is Hz, the setting range is ~5000000000, and the precision is 500HHz.
力:1-high power 1W,0-低電力 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, which 2 is meaningful
Baseband version number: The upper 4 ビット represent the major version number, and the lower 4 ビット 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 (about 2 秒) 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.
Table 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 | *200ミズ |
| 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 Key
8.1.4.6 Set Key
Configuration Packet:0x68 0x21 0x0F Key
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 is“Simulhoc2618_V1.0.0”
8.1.4.8 module
Return package:0x68 0x01 0x55
8.1.4.9 Save configuration
command to save all settings to Flash, 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 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 Length 0xA2 Transparent
8.1.4.11 Data transmission
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 bytes. 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
