# modbus_rtu

**Repository Path**: ShadowThreeD/modbus_rtu

## Basic Information

- **Project Name**: modbus_rtu
- **Description**: example for libmodbus
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-03-21
- **Last Updated**: 2022-03-28

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

Overview
========
This project is a example for testing libmodbus RTU mode.
Both USB-to-serial port and virtual-serial-port can work well by change the device's name.

Using by virtual serial port
========
1. If you don't have enough USB-to-serial port at hands, please execute following cmd to create 2 virtual port:
```bash
socat pty,raw,echo=1,link=/home/shadow3d/dev/ttyV1 pty,raw,echo=1,link=/home/shadow3d/dev/ttyV2 > /dev/null 2>&1 &
```
2. Clone the `modbus_rtu_client` and `modbus_rtu_server` branch;
```bash
git clone --branch=modbus_rtu_client https://gitee.com/ShadowThreeD/modbus_rtu.git ./modbus_rtu_client
git clone --branch=modbus_rtu_server https://gitee.com/ShadowThreeD/modbus_rtu.git ./modbus_rtu_server
```
3. Enter modbus_rtu_server and run below command to build the modbus server code:
```bash
gcc -Wall ./random-test-server.c ./libmodbus/*.c -o server.out
./server.out
```
4. Enter modbus_rtu_client and run below command to build the modbus client code:
```bash
gcc -Wall ./random-test-client.c ./libmodbus/*.c -o client.out
./client.out
```
5. You can see "Test: SUCCESS" in client terminal now. 

Using by USB-to-serial port
====
1. Clone the `modbus_rtu_client` and `modbus_rtu_server` branch;
```bash
git clone --branch=modbus_rtu_client https://gitee.com/ShadowThreeD/modbus_rtu.git ./modbus_rtu_client
git clone --branch=modbus_rtu_server https://gitee.com/ShadowThreeD/modbus_rtu.git ./modbus_rtu_server
```
2. Please modify the device's name to something like `/dev/ttyUSB*` in `random-test-client.c` in `modbus_rtu_client`;
3. Please modify the device's name to something like `/dev/ttyUSB*` in `random-test-server.c` in `modbus_rtu_server`;
4. Enter modbus_rtu_server and run below command to build the modbus server code:
```bash
gcc -Wall ./random-test-server.c ./libmodbus/*.c -o server.out
./server.out
```
5. Enter modbus_rtu_client and run below command to build the modbus client code:
```bash
gcc -Wall ./random-test-client.c ./libmodbus/*.c -o client.out
./client.out
```
6. You can see "Test: SUCCESS" in client terminal now. 

Git command
=====
```bash
git remote add origin https://gitee.com/ShadowThreeD/modbus_rtu.git
git push -u origin m1:m2                        # push local branch m1 to remote branch m2
git branch --remotes                            # show remote branch
git push -u origin -d modbus_rtu_master         # delete remote branch
```