IoT Protocol -- 电力 101,104 协议

理论 #

洪城小电工 on 简书 #

• 从零开始理解 IEC104 协议之一 104 规约帧格式, bak
• 从零开始理解 IEC104 协议之二 基础知识, bak
• 从零开始理解 IEC104 协议之三 主要过程中的一些技术细节, bak
• 从零开始理解 IEC104 协议之四 工程调试经验总结, bak
• 从零开始理解 IEC104 协议之五 数据安全, bak

工具 #

经典、简约的 101 和 104 主站、从站模拟器 #

1. PMA 使用方法 by forum.huawei， bak
2. 101_104_MASTER, bak

其他 #

看起来比较不错的一款收费软件 CNY55~70（没有试过）

IoT Edge Deep Learning Neural Network Accelerators

Coral Edge Accelerator #

• ML accelerator: Edge TPU ASIC (application-specific integrated circuit) designed by Google. Provides high-performance ML inferencing for TensorFlow Lite Models.
• USB 3.1 (gen 1) port and cable (SuperSpeed, 5Gb/s transfer speed)
• Dimensions: 30 x 65 x 8mm
• Price: USD74.99 in 2019, USD ＄ 60 in 2021, ￥ 740 @JD.com
• 0.5 watts/TOPS
• MAX 4 TOPS (int8), 2W.
• TF Lite + Debian only.
• Not available world wide

Intel NCS2 Neural Compute Stick 2 #

• Processor: Intel Movidius Myriad X Vision Processing Unit (VPU)
• USB 3.0 Type-A
• Dimensions: 72.5 x 27 x 14mm
• Price: USD ＄ 87.99 (2019), USD ＄ 72 (2021), ￥ 570 @JD.com
• MAX 4 TOPS, 7 W.
• Any model (TF, PyTorch, Caffe …)

ref

IoT Protocol -- Modbus

OSI vs. Modbus Layers:

Tip:

• RS-485/RS485’s new name is EIA-485.
• UART usually (99%) means TTL in shops, not 232/485.
• DB9 physical port usually (90%) means 232 electrical signals level standards.

Modbus Protocol #

See Also：

• 【strongly recommend！】 a nice intro to Modbus and Modbus Enron. (Simply Modbus 软件收费，但是这个 Modbus 入门文档非常好)
• 一文看懂 Modbus 协议
• Complete Modbus Guide.
• a good intro to Modbus.

Each Modbus Slave has 4 tables with 9999 values in each table.

MQTT

Server #

ActiveMq Classic #

Require: JAVA_HOME (JDK is preferred than JRE, if in development, as JRE ∈ JDK. 150MB) && reboot.

e.g.: Apache ActiveMq (ref, bak).

cd bin
./activemq-admin.bat create mybroker
cd mybroker/bin/
mybroker.bat start

http://127.0.0.1:8161/

EMQX #

Require: Erlang (150MB) (will install MS VC++ Redist. 2015).

ref

download #

https://www.emqx.io/downloads?os=Windows

hands-on #

web: localhost:18083 default account: admin/public

ref: EMQX dashboard, bak

ref: EMQX+Prometheus+Grafana：MQTT 数据可视化监控实践, bak

Client #

e.g. MQTTX, Chrome MQTTBox, etc.