एसएनएम401 तदर्थ नेटवर्क मॉड्यूल
विषयसूची
1. उत्पाद वर्णन
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, और उस समय पर ही, के माध्यम से “स्व-रिले वायरलेस संचार” प्रौद्योगिकी, यह मॉड्यूल के बीच स्वचालित रूप से स्वचालित रिले का एहसास करता है, जिससे कवरेज प्रभाव और संचरण दूरी में काफी सुधार होता है. SNM401 तदर्थ नेटवर्क वायरलेस संचार प्रौद्योगिकी को अपनाता है, कोई भी नोड एक ही समय में कई नोड्स द्वारा अग्रेषित एक ही सिग्नल को प्राप्त और संसाधित कर सकता है, विभिन्न नोड्स से अग्रेषित इन संकेतों को संयोजित करें, मूल जानकारी को यथासंभव अधिक से अधिक डिमॉड्यूलेट करें, 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. उत्पाद की विशेषताएँ
◆Operating frequency: 400-500मेगाहर्ट्ज
◆Single-hop transmission distance: 3～5Km
◆Dynamic topology convergence: 1सुश्री
◆Transmit power: 1डब्ल्यू
◆Receive sensitivity: -127dBm
◆Working voltage: 3.5-4.5वी
◆Signal to noise ratio Threshold: 1डीबी
◆Channel spacing: 12.5KHz
◆Frequency stability: 1पीपीएम
◆Intermodulation: 65डीबी
◆Encryption: 256एईएस
◆Spurious response immunity: 75डीबी
◆Adjacent channel selectivity: 65dB@12.5KHzz
◆Operating temperature: -40～ +85℃
◆Module size: 33.5X42X3.4mm
3. आवेदन
◆Internet of Things ◆Individual Soldier System ◆Emergency Broadcasting
◆UAV ◆Real-time Remote Control ◆Digital Intercom
◆Emergency Communication ◆Robot ◆Wireless Data Transmission
4. Working Parameters
मेज़ 1: Operating Parameters Table
| पैरामीटर | शर्तेँ | न्यूनतम | ठेठ | ज्यादा से ज्यादा | इकाई |
| Operating Frequency Band | 400 | 500 | मेगाहर्ट्ज | ||
| परिचालन तापमान | -40 | 25 | +85 | ℃ | |
| ऑपरेटिंग वोल्टेज | 3.5 | 4 | 4.5 | वी | |
| Transmitting Power | 30 | dBm | |||
| संवेदनशीलता प्राप्त करना | -130 | -127 | -125 | dBm | |
| Maximum RF Input Power | +33 | dBm | |||
| सीरियल पोर्ट बॉड दर | 115200 | बीपी | |||
| sleep current | @ EN=0 | 40 | uA | ||
| receive current | 160 | एमए | |||
| transmit instantaneous current | @VCC==4V, 1डब्ल्यू | 1800 | एमए | ||
| transmit average current | @VCC==4V, 1डब्ल्यू | 600 | एमए | ||
| audio input voltage | 1.5 | वीपीपी | |||
| audio output Impedance | 150 | ओम |
ध्यान दें: If the working conditions of the module exceed the above limit values, यह मॉड्यूल को स्थायी नुकसान पहुंचा सकता है.
5. Module pins and definitions
आकृति 1 SNM401 Pin आरेख
| Abbreviation | विवरण |
| ऐ | अनुरूप इनपुट |
| AO | अनुरूप उत्पादन |
| AIO | Analog bi-direction |
| DI | Digital input |
| करना | डिजिटल आउटपुट |
| DIO | Digital bi-direction |
| पी | शक्ति |
| जी | ज़मीन |
मेज़ 3 SNM401 pin definition
| पिन नं | पिन नाम | प्रकार | विवरण |
| 1 | GND | जी | GND |
| 2 | चींटी | AIO | antenna port |
| 3 | GND | जी | GND |
| 4 | GND | जी | GND |
| 5 | वीबीएटी | पी | External 3.5V-4.5V battery or power supply, 4V is recommended |
| 6 | वीबीएटी | पी | |
| 7 | GND | जी | GND |
| 8 | GND | जी | GND |
| 9 | TX_STATE | करना | module transmit indication Signal, the high level is transmitting |
| 10 | RX_STATE | करना | module receiving indication signal, the high level is receiving |
| 11 | एनसी | No connect | |
| 12 | एनसी | No connect | |
| 13 | GND | जी | GND |
| 14 | TXD | करना | serial port data transmitting pin |
| 15 | आरएक्सडी | DI | serial port data receiving pin |
| 16 | तय करना | DI | module Serial port configuration signal, configure parameters when high level, send and receive data when low level |
| 17 | में | DI | module open enable signal, high level open, low level close |
| 18 | GND | जी | 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. पैकेज का आकार
आकृति 2 SNM401 size chart
आकृति 3 SNM401 package Figure
7. LAYOUT precautions
1.NSSNM401 module works at 400-500मेगाहर्ट्जand the influence of various factors on wireless transceivers should be avoided.
- यह 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, उदाहरण के लिए, 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 पैरामीटर विन्यास
Users can obtain and configure parameters through the serial port, the serial port baud rate है 115200, the data bit is 8बिट, the stop bit is 1बिट, and there is no parity bit.
मेज़ 4 Serial port packet format
| Serial port table packet | |||
| identification word | लंबाई | आज्ञा | instruction reply/reply content |
| 1बाइट | 1बाइट | 1बाइट | NByte |
8.1.1 Identification word
The identification word is fixed as 0x68.
8.1.2 लंबाई
लंबाई विन्यास योग्य आरएफ आउटपुट पावर आज्ञा + command content/reply content.
8.1.3 आज्ञा
स्तंभ व्यास 5 Serial Command-List
| समारोह | आज्ञा | सामग्री | Reply Content |
| Acquire RF Parameters | 0x00 | नहीं | आवृत्ति(4बाइट) +शक्ति(1बाइट) +विन्यास
स्थिति(1बाइट) +शोर(2बाइट) +Baseband Version Number(1बाइट) |
| Set RF Parameter | 0x01 | आवृत्ति(4बाइट) +शक्ति(1बाइट) | नहीं |
| data relay level | 0X0C | नहीं | data relay level(1बाइट) |
| Set data relay level | 0X0D | Data relay level(1बाइट) | नहीं |
| key to acquire | 0X0E | नहीं | चाबी(32बाइट) |
| set key | 0X0F | चाबी(32बाइट) | नहीं |
| get module version | 0X 12 | नहीं | module name + version number |
| module ready | 0x55 | नहीं | नहीं |
| save configuration | 0x66 | नहीं | नहीं |
| data receive | 0xA2 | नहीं | पारदर्शी डेटा (NByte) |
| data send | 0xB2 | पारदर्शी डेटा (NByte) | नहीं |
8.1.4 Instruction content/reply content
8.1.4.1 Obtaining RF parameters
आवृत्ति: The unit is हर्ट्ज, the setting range is ~5000000000, and the precision is 500HHz.
शक्ति:1-उच्च शक्ति 1डब्ल्यू,0-कम बिजली 0.5डब्ल्यू, the default is high power 1डब्ल्यू.
Configuration status: Indicates the radio configuration status,0-uninitialized,1-configuring,2-configured successfully.
Noise Floor: Indicates the current frequency noise intensity, कौन कौन से 2 is meaningful
Baseband version number: The upper 4 बिट्स represent the major version number, and the lower 4 बिट्स 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 (के बारे में 2 सेकंड) 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 एन 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.
मेज़ 6 Comparison of Relay Levels
| Relay Hops | Transmission Bytes | Transmission Time |
| एन | <36 | N*50ms |
| एन | 37-72 | N*100ms |
| एन | 73-108 | N*150ms |
| एन | 109-144 | *200सुश्री |
| एन | 145-180 | N*250ms |
| एन | 181-216 | N*300ms |
| एन | 217-252 | N*350ms |
| एन | 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 कुंजी
8.1.4.6 Set Key
Configuration Packet:0x68 0x21 0x0F कुंजी
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 है“Simulhoc2618_V1.0.0”
8.1.4.8 मापांक
Return package:0x68 0x01 0x55
8.1.4.9 Save configuration
command to save all settings to फ़्लैश, 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 तय करना 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 लंबाई 0xA2 पारदर्शी
8.1.4.11 डेटा ट्रांसमिशन
Only when the तय करना pin is at a low level can data be transmitted, and the data sent in a single transmission does not exceed 36 बाइट्स. 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
