SNM401自组网模块规格书

SNM401自组网模块规格书

1、产品描述

SNM401无中心自组网模块实现了各模块相互之间的无中心远距离通信,采用全球最新的LDPC编解码技术,相对于传统电台所使用的RS级联卷积码可有5dB的编码增益,同时通过 “自中继无线通信”技术,创新性地实现各模块之间自动中继,从而大大提高了覆盖效果和传输距离。SNM401采用自组网无线通信技术,任意节点可以接收处理来自多个节点同时转发的同一信号,将这些来自不同节点转发的信号进行信号合并,最大可能地解调原始信息,具有更大的传输距离和更高的传输可靠性。自组网无线通信技术不需要路由,多个节点通过接收信号质量和场强自动判决是否启动转发,将中继由多跳单点中继提升为多跳多点中继,将中继从线状中继提升为网状中继,中继网络中任意节点发生断线脱网时,中继网络中的其它中继线路正常工作,使得中继效果不受影响。

2、产品特点

◆工作频率:400-500MHz

◆单跳传输距离:3~5Km

◆动态拓扑收敛:1 毫秒

◆发射功率:1W

◆接收灵敏度:-127dBm

◆工作电压:3.5-4.5V

◆信噪比门限:1dB

◆信道间隔:12.5KHz

◆频率稳定度:1ppm

◆互调:65dB

◆加密:256AES

◆杂散响应抗扰性:75dB

◆邻道选择性:[email protected]

◆工作温度:-40~+85℃

◆模块尺寸:33.5X42X3.4mm

3、应用领域

◆物联网       ◆单兵系统      ◆应急广播

◆无人机    ◆实时远程控制   ◆数字对讲

◆应急通信  ◆机器人        ◆无线数据传输

4、工作参数

表一:工作参数表

参数条件最小典型最大单位
工作频段 400 500MHz
工作温度 -4025+85
工作电压 3.544.5V
发射功率  30 dBm
接收灵敏度 -130-127-125dBm
最大射频输入功率   +33dBm
串口波特率  115200 bps
休眠电流@ EN=0 40 uA
接收电流  160 mA
发射瞬时电流@VCC==4V,1W  1800mA
发射平均电流@VCC==4V,1W 600 mA
音频输入电压   1.5VPP
音频输出阻抗  150 Ohm

注:如果模块工作条件超过上述各项极限值,可能对模块造成永久性损坏。

5、模块引脚及定义

SNM401-Ad-Hoc-Network-Module-pin-define
SNM401-Ad-Hoc-Network-Module-pin-define

图 1 SNM401 引脚图

表 2 类型缩写表

缩写描述
AIAnalog input
AOAnalog output
AIOAnalog bi-direction
DIDigital input
DODigital output
DIODigital bi-direction
PPower
GGround

表 3 SNM401引脚定义

Pin NOPin nameTypeDescription
1GNDGGND
2ANTAIO天线口
3GNDGGND
4GNDGGND
  5V-BATP外接 3.5V-4.5V 电池或电源,建议 4V
6V-BATP
7GNDGGND
8GNDGGND
9TX_STATEDO模块发射指示信号,高电平为发射
10RX_STATEDO模块接收指示信号,高电平为接收
11NC No connect
12NC No connect
13GNDGGND
14TXDDO串口数据发射脚
15RXDDI串口数据接收脚
16SETDI模块串口配置信号,高电平时配置参数,低电平时收发数据
17ENDI模块开启使能信号,高电平开启,低电平关闭
18GNDGGND
19PRO1DIO可编程定义管脚
20PRO2DIO可编程定义管脚

注:模块内部经过 3.3V LDO 稳压,所有的数字 IO 均为 3.3V 电平。

6、封装尺寸

SNM401-Ad-Hoc-Network-Module-size-dimension
SNM401-Ad-Hoc-Network-Module-size-dimension

图 2 SNM401 尺寸图

SNM401-Ad-Hoc-Network-Module-Package-diagram
SNM401-Ad-Hoc-Network-Module-Package-diagram

图 3 SNM401 封装图

7、LAYOUT 注意事项

1、SNM401 模块工作在 400-500MHz,应避免各种因素对无线收发的影响。

2、模块下方铺大片 GND,走线尽量往外围延伸。

3、建议在基板上的模块贴装位置使用绝缘材料进行隔离,例如在该位置放一个整块的丝

印。

4、尽量走一条短而粗电源线给模块,推荐铜线宽度80mil,去耦电容尽量靠近电源引脚放置。

8、软件配置

8.1 参数配置

用户可通过串口进行参数获取配置,串口波特率 115200,数据位 8bit,停止位 1bit,无奇偶校验位。

表 4 串口包格式

串口表格包
识别字长度指令指令回复/回复内容
1Byte1Byte1ByteNBytte

8.1.1 识别字

识别字固定为 0x68。

8.1.2 长度

长度 = 指令 + 指令内容/回复内容。

8.1.3 指令

表 5 串口指令表

功能指令指令内容回复内容
获取射频参数0x00频率(4Byte)+功率(1Byte)+配置 状态(1Byte)+底噪(2Byte)+基带 版本号(1Byte)
设置射频参数0x01频率(4Byte)+功率(1Byte)
获取数据中继等级0x0C数据中继等级(1Byte)
设置数据中继等级0x0D数据中继等级(1Byte)
获取密钥0x0E密钥(32Byte)
设置密钥0x0F密钥(32Byte)
获取模块版本0x12模块名称+版本号
模块就绪0x55
保存配置0x66
数据接收0xA2透传数据(NByte)
数据发送0xB2透传数据(NByte)

8.1.4 指令内容/回复内容

8.1.4.1 获取射频参数

频率:单位为 Hz,设置范围为 400000000~5000000000,精度为 500HHz。

功率:1-高功率 1W,0-低功率 0.5W,默认为高功率 1W。

配置状态:指示射频配置状态,0-未初始化,1-配置中,2-配置成功。

底噪:指示当前频率噪声强度,只有当配置状态为 2 时才有意义。

基带版本号:高 4bit 代表主版本号,低 4bit 代表次版本号。

配置包:0x68 0x01 0x00

返回包:0x68 0x0A 0x00 频率 功率 配置状态 底噪 基带版本号

8.1.4.2 设置射频参数

配置射频参数后,须等待配置成功后(约 2 秒),模块才能正确进入设定工作状态。

配置包:0x68 0x06 0x01 频率 功率

返回包:0x68 0x01 0x01

8.1.4.3 获取数据中继等级

SH无中心自组网技术是同播网状中继方式,不需要路由,可大幅度提高覆盖范围。中继跳数 N 是指在数据传输时可以进行中继的跳数,最大中继跳数为 16。每增加一跳,传输距离会增加一倍,但传输时间会相应增加,如下表所示。

表 6 中继等级比较

中继跳数传输字节数传输时间
N <36N*50ms
N37-72N*100ms
N73-108N*150ms
N109-144N*200ms
N145-180N*250ms
N181-216N*300ms
N217-252N*350ms
N253-288N*400ms

配置包:0x68 0x01 0x0C

返回包:0x68 0x02 0x0C 数据中继等级

8.1.4.4 设置数据中继等级

配置包:0x68 0x02 0x0D 数据中继等级

返回包:0x68 0x01 0x0D

8.1.4.5 获取密钥

密钥用于通信加密,模块将自动丢弃密钥与自身密钥不一致的语音信息、数据信息,密钥默认为全 0。

配置包:0x68 0x01 0x0E

返回包:0x68 0x21 0x0E 密钥

8.1.4.6 设置密钥

配置包:0x68 0x21 0x0F 密钥

返回包:0x68 0x01 0x0F

8.1.4.7 获取模块版本

配置包:0x68 0x01 0x12

返回包:0x68 0x15 0x12 0x53 0x69 0x6D 0x75 0x6C 0x48 0x6F 0x63 0x32 0x36 0x31 0x38 0x5F 0x56 0x31 0x2E 0x30 0x2E 0x30 0x00 即“SimulHoc2618_V1.0.0”

8.1.4.8 模块就绪

指令将在设备上电初始化完成后自动发送,指示设备已就绪。

返回包:0x68 0x01 0x55

8.1.4.9 保存配置

指令将所有设置保存至 Flash,重上电后将直接使用已保存配置。

配置包:0x68 0x01 0x66

返回包:0x68 0x01 0x66

8.1.4.10 数据接收

当 SET 引脚为低电平时,模块将接收到的数据包直接透传给用户。长度根据实际透传数据长度变化。

返回包:0x68 长度 0xA2 透传数据

8.1.4.11 数据发送

当 SET 引脚为低电平时,才能进行数据发送,单次发送数据不超过 36 字节。长度根据实际透际透传数据长度变化。若收到返回包,表明本次数据发送失败。

配置包:0x68 长度 0xB2 透传数据

返回包:0x68 0x01 0xB

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FAQs about Wireless Video Transmitter and Receiver

Our wireless video transmitters have these types of video input interfaces: HDMI 1080P and 4K HDMI, CVBS composite, SDI, AHD, IP Ethernet, BNC, or tell us what type do you need, our engineer will modify to meet your demand.

Our transmission distance can be adjusted by adding power amplifiers. At present, the main ones are 15km, 30km, 50km, 80km, 100km , and 150km, which depend on the needs of customers.

Of course, the transmission distances listed above are all within LOS the line-of-sight range. If there are obstacles between the transmitter and the receiver, NLOS (the non-line-of-sight), the transmission distance is greatly reduced, only 1km or 2km, depending on the number of intermediate obstacles and the local wireless environment.

One-way means, We can only transmit and download video or data from the wireless video transmitter to the receiver in one direction, and we cannot upload video or data from the receiver to the transmitter. This type is also called simplex.

Two-way means that, not only we can download video or data from our wireless transmitter to the receiver, but also we can upload the video or data from the receiver to the transmitter. This is very suitable for operating drones. You can not only see the real-time video transmitted from the drone, but also upload the command to control the drone or the command to control the PTZ camera to adjust the angle to the transmitter. This can operate simultaneously. This type also named half-dulpex or full-duplex.

Please check the details at the below link. https://ivcan.com/request-a-quote-of-wireless-video-transmission/#simplex

Most Wireless video transmitters now support AES128 or AES256 bit encryption and decryption, depending on which model you choose. Please contact us to verify.

The frequencies of both the wireless video transmitter and the wireless video receiver can be modified. Users need to purchase additional parameter configuration boards.

However, considering that the corresponding power amplifier and antenna are already fixed within a certain range when the goods are sent out. If the user adjusts the frequency of the transmitter, the corresponding power amplifier, transmitter antenna and receiver antenna should also be modified to the same frequency, and these users need to be prepared. If not, it will cause the frequency of the wireless video transmitter to be different from the frequency of the antenna, making reception difficult. So please be sure to inform the correct frequency you need before placing an order.

If it is for security or confidentiality, you can use the encryption and decryption functions of the transmitter and receiver, which can ensure that your video transmission is private. .

Yes, all our product parameters can be customized according to customer's needs. If you have a special request, please let us know via the link below.

https://ivcan.com/request-a-quote-of-wireless-video-transmission/

  1. Change the place of the receiver to avoid potential local interference from strong magnetic environments.
  2. Ensure that the antennas on both the transmitter and receiver are vertical.
  3. Please raise the antennas of the transmitter and receiver to maintain a certain height difference.
  4. Please look around to ensure that there are no obstacles between the transmitter and receiver.
  5. Change the orientation of the receiver antenna.
  6. If it doesn't work, try moving the receiver to be near the transmitter's position to see if it exceeds the effective wireless transmission distance.
  7. Or consider adding a relay of the transmitting between the transmitter and receiver.
  8. The antenna should be as high off the ground as possible, as the ground will absorb the transmitted signal.
We can, of course, supply wireless video transmitter modules and power amplifiers.
For the first sample test, I recommend that you purchase the entire set of products because our engineers have optimized the parameters to achieve the best performance.
After you have completed your test verification, you can remove the case or heat sink, install it in your device, and constantly adjust the parameters to achieve the best performance. In the future, you will be able to purchase only the modules or accessories that you require.

Of course, we also understand that wireless video transmission transmitters and receivers are very expensive. You are far away from the China factory. and hope that the goods you receive are fit for the best performance.

If you pay special attention to a specific parameter or function, we can take some test videos based on the features you want to see, please feel free to contact us. It won't be shipped to you directly without your approval.

To test the delay of the wireless video transmitter and receiver, we need to do two tests.

The first is to test the delay from the camera to the display.

The second is the camera, plus the display plus the wireless image transmission transmitter and the delay of the receiver.

Subtracting the two test results is the real delay of the wireless video transmitter and receiver.

As a professional long-range HDMI wireless video transmitter and receiver supplier and manufacturer in China Shenzhen, we produce the best wireless video transmitter and receiver for many years, and we got a good reputation and best reviews.

Some famous brands of wireless video transmitters, like Blackmagic, Holyland mars 300 400s, Accsoon cine eye 5g, RavenEye, Zhiyun, Inkee benbox, actiontec, CVW SWIFT 800, dahua, iogear, Artek pat-225k, microlite, nyrius, teradek.

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The full HD video, audio, data link smallest 1080P wireless video transmitter and the receiver has many input and output connectors, like AV composite CVBS, HDMI, SDI, BNC, VGA, USB.

The wireless video transmitter sender TX RX frequency has 170-806Mhz, 1.2ghz, 2.4G, 5.8G, lowest but not zero latency. In order to support longer distances, the power amplifier has 10w, 20watts, and even 30W.

What is a best buy FHD wireless video transmitter at a cheap price? It should consider your details requirement, choose suitably, not expensive, if you have any doubt, please fulfil the request a quote form, our engineer will offer you a solution.

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