SNM401 ad hoc network module 自组网模块规格书
SNM401 Ad Hoc Network Module Specifications
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 millisecond
◆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：12.5Eliz
◆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：65[email protected]
◆工作温度：-40～+85℃
◆模块尺寸：33.5X42X3.4mm
3、Applicationem agri
◆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 |
| frequency opus | 400 | 500 | MHz | ||
| Operating Temperature | -40 | 25 | +85 | ℃ | |
| Operating intentione | 3.5 | 4 | 4.5 | V | |
| Transmittunt potestatem | 30 | DBM | |||
| Sensus accepto | -130 | -127 | -125 | DBM | |
| 最大射频输入功率 | +33 | DBM | |||
| 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 | 1800 | mA | ||
| 发射平均电流 | @VCC==4V，1W | 600 | mA | ||
| 音频输入电压 | 1.5 | VPP | |||
| 音频输出阻抗 | 150 | olim |
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
图 1 SNM401 引脚图
表 2 类型缩写表
| 缩写 | 描述 |
| AI | Analog input |
| AO | Analog output |
| AIO | Analog bi-direction |
| DI | Digital input |
| DO | Digital output |
| DIO | Digital bi-direction |
| P | potestatem |
| G | Humus |
表 3 SNM401引脚定义
| Pin NO | Pin name | genus | Description |
| 1 | GND | G | GND |
| 2 | FORMICA | AIO | 天线口 |
| 3 | GND | G | GND |
| 4 | GND | G | GND |
| 5 | V-BAT | P | 外接 3.5V-4.5V 电池或电源，建议 4V |
| 6 | V-BAT | P | |
| 7 | GND | G | GND |
| 8 | GND | G | GND |
| 9 | TX_STATE | DO | 模块发射指示信号，高电平为发射 |
| 10 | RX_STATE | DO | 模块接收指示信号，高电平为接收 |
| 11 | NC | No connect | |
| 12 | NC | No connect | |
| 13 | GND | G | GND |
| 14 | TXD | DO | 串口数据发射脚 |
| 15 | RXD | DI | 串口数据接收脚 |
| 16 | SET | DI | 模块串口配置信号，高电平时配置参数，低电平时收发数据 |
| 17 | EN | DI | 模块开启使能信号，高电平开启，低电平关闭 |
| 18 | GND | G | GND |
| 19 | PRO1 | DIO | 可编程定义管脚 |
| 20 | PRO2 | DIO | 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
图 2 SNM401 尺寸图
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 |
| 1Byte | 1Byte | 1Byte | NBytte |
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 | 无 | frequency(4Byte)+potentia(1Byte)+配置 状态(1Byte)+底噪(2Byte)+基带 版本号(1Byte) |
| 设置射频参数 | 0x01 | frequency(4Byte)+potentia(1Byte) | 无 |
| 获取数据中继等级 | 0x0C | 无 | 数据中继等级(1Byte) |
| 设置数据中继等级 | 0x0D | 数据中继等级(1Byte) | 无 |
| 获取密钥 | 0x0E | 无 | 密钥(32Byte) |
| 设置密钥 | 0x0F | 密钥(32Byte) | 无 |
| 获取模块版本 | 0x12 | 无 | 模块名称+版本号 |
| 模块就绪 | 0x55 | 无 | 无 |
| 保存配置 | 0x66 | 无 | 无 |
| 数据接收 | 0xA2 | 无 | 透传数据(NByte) |
| 数据发送 | 0xB2 | 透传数据(NByte) | 无 |
8.1.4.1 获取射频参数
frequency：单位为 Hz，设置范围为 400000000~5000000000，精度为 500HHz。
potentia：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 | <36 | N*50ms |
| N | 37-72 | N*100ms |
| N | 73-108 | N*150ms |
| N | 109-144 | N*200ms |
| N | 145-180 | N*250ms |
| N | 181-216 | N*300ms |
| N | 217-252 | N*350ms |
| N | 253-288 | N*400ms |
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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