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工業通訊 for Industrial IoT (IIoT)
Outline
Topic1: Modbus over RS485
Topic2: EtherCAT
Topic1: Modbus over RS485
RS485
為半雙工(同一時間只能選擇傳送或接收的動作)
為差動傳輸,使用纜線兩端(D+、D-)的電壓差來表示傳遞
訊號
常用於單機傳送(Master),多機接收(Slave)的通訊鏈結。可
將數個感應裝置的數值回傳給Master
UART RX
UART TX
Host
短路
GPIO
RS232 to RS485: 自動切換工作模式
電路解說: https://blog.csdn.net/electrocrazy/article/details/72356631
RS485 接線
Modbus over RS485:
Modbus是一種串列通訊協定
Modbus為master/slave架構。一個裝置為Master節點,
其他節點為slave。
每一個slave裝置都有一個唯一的位址/ID (1~247)
• Since a single byte is normally used to define the slave
address and each slave on a network requires a unique
address, the number of slaves on a network is limited to 256.
The limit defined in the modbus specification is even lower at
247.
master和slave之間走的Modbus 協定其封包格式有分
ASCII 或RTU兩種
ASCII 為文字模式, 用character 傳送, RTU 為binary 模式
傳送
Modbus Format
Slave ID | Function Code | Data | CRC
Information is stored in the Slave device in four different
tables.
Each register is 1 word = 16 bits = 2 bytes and also has
data address between 0000 and 270E.
Coil/Register Numbers can be thought of as location
names since they do not appear in the actual messages.
The Data Addresses are used in the messages.
Function code
This number tells the slave which table to access and
whether to read from or write to the table.
Function Code (Command) 3 is to read 4xxx registers,
and 4 for 3xxx registers.
Example
Example:酸鹼度分析儀
www.aquas.com.tw
SMR04系列 酸鹼度分析儀
Lab: MODBUS 界面溫濕度感測器
13
模組介紹
產品採用工業級晶片、高精度溫濕度探頭,確保產品的優
異可靠性、高精度、互換性。
採用RS485硬體介面(具有防雷設計),協定層相容標準的工
業Modbus-Rtu協定。
工作溫度:溫度-20℃+60℃, 濕度0% RH-80%RH
精度:溫度±0.3℃(25℃),濕度±3%RH(25℃)
http://goods.ruten.com.tw/item/show?21707257441088
14
Modbus Protocol
15
http://libmodbus.org/
16
tar zxvf libmodbus-3.1.4.tar.gz
cd libmodbus-3.1.4
./configure && make && make install
範例參考: RS485 溫溼度感測器
cd pi-sensor/examples/PH-Sensor-code/SMR04
make
export LD_LIBRARY_PATH=/usr/local/lib
./mod
17

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Modbus over RS485