Industrial Shields is a worldwide leader in the use of Industrial Technology based on Open Source licenses using Arduino, Raspberry Pi or other Open Source platforms available in the market.

✅ This video shows a summary of the updated post made by our technical team. You will understand how the softwareserial library for Arduino can be used and what is the difference between softwareserial.h and hardwareserial.h.

You can see the post on the link below:
https://www.industrialshields.com/blog/arduino-industrial-1/post/usando-la-libreria-software-serial-en-plcs-de-industrial-shields-99
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Other interesting links:
Join the Channel:
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Free Arduino course::
https://www.industrialshields.com/programming-arduino-on-industrial-environments-course-10-chapters

Arduino Industrial Controller(Arduino based PLC):
ARDBOX Family:
https://www.industrialshields.com/industrial-plc-based-on-arduino-original-boards-automation-solutions-20ios
ETHERNET Family:
https://www.industrialshields.com/industrial-plc-based-on-arduino-original-boards-automation-solutions

SUMMARY of the post:
What is Arduino Serial Communication and How to use it.
There are different types of Serial Communications. When you use an Arduino board in a project, you can choose the standard Serial pins such as Rx, Tx, from the UART inside the Arduino board, so it is called Serial TTL. In that case, you will use the Hardwareserial.h library but there are some additional pins that can work as an Rx or Tx. For example, the SPI communication pins can work as a MISO, MOSI and Select (SC), but they are also pins that can work as a digital input or digital output, or if you need you can use those pins as Rx, Tx using the library softwareserial.h.

Serial communications allow you to connect two different devices sending and receiving data between them.

The Serial TTL port can be transformed as required in the Industry as a RS232 and as a RS485. When RS232 is used, the functionality is quite similar to working as Serial TTL but, if you work with RS485, you can configure a network using a Master device that is capable of connecting to Slave devices. So the number of devices has been increased from 2 to 32 devices (nodes). And the maximum distance between them can be up to 1220m if the wiring is well done and EMC compliant and electrical noise is avoided.

To sum up, if you are using the UART serial port from the Arduino or from the Arduino based PLC for Industrial projects, the use of other pins working as a Serial TTL can help you with the successful development of your project. So, that additional serial port must be programmed using softwareserial.h library.

If the hardwareserial library can not be used because you need to use a communication protocol that requires the use of a physical UART instead of a virtual serial port, then, you could convert the RS232 or RS485 standard from the device to a Serial TTL. (This example will be shown in another post).

In this post, we explain the advantage of the SoftwareSerial library to simulate a serial port through Software (virtual serial TTL) using the Arduino IDE.

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