---
title: Modbus
tags: thingsboard-gateway
image:
---

# Modbus

@eric82418

:::info
**What is Modbus?**
* Modbus is a data communications ==**protocol**== which is popular in industrial electronic devices.
* The Modbus protocol uses character serial communication lines, Ethernet, or the Internet protocol suite as a transport layer.
* 是一種master/slave架構，整個通訊網路中能夠同時擁有多個 slaves，但是只允許擁有一個專門發送請求的 Master。
*

:::

## Modbus Connector

### Modbus Master (Client)

### Modbus Slave (Server)

### Serial

**Serial Protocols**
The RJ-45, RS232, RS485, RS422 serial protocols only relate to the hardware interface, not the
software protocols used to make the devices communicate.

#### TCP / UDP Modbus

#### Modbus RTU

#### Modbus ASCII

## References
* [Wikipedia - Modbus](https://en.wikipedia.org/wiki/Modbus)
* [Modbus RTU簡介(上)](https://ithelp.ithome.com.tw/articles/10282249)
* [Modbus學習紀錄I](https://hackmd.io/@YMont/BJhnG-kfY)
* [Modbus](https://www.mtl-inst.com/images/uploads/TSN_MTL838C_Modbus_Rev_1.pdf)