#10 Serial TTL, RS232, RS485

Communications in Arduino’s PLC is one of the most outstanding points to consider because is one of their strengths and, related to this, there are so many communication protocols.  In this chapter, we are going to see three different types of the main communication protocols; Serial TTL, RS-232 and RS-485.

Serial TTL is a Serial kind of TTL (Transistor-Transistor Logic) communication. TTL is a logic family from bipolar junction transistors. These transistors perform the logic and the amplifying function too.

RS-232 is another standard for serial communication transmission of data. It formally defines signals connecting between DTE (data terminal equipment) such as a computer terminal, and a DCE (data circuit--terminating equipment or data communication equipment), such as a modem.

RS-485 is, one more time, a standard for serial communication systems in which electrical signaling is balanced and multipoint systems are supported. Digital communications networks implementing the standard can be used effectively over long distances and in electrically noisy environments. Multiple receivers may be connected to such a network in a linear, multidrop bus.

With the information shown in this introduction, we can proceed to watch the video.

Now that we are located, we can proceed to the main explication on the video and, if you want to discover more information related to Ethernet, you can check the links than below.

Useful Links

• Arduino IDE
• Processing
• Industrial Shields Library​​​​​​ from GitHub

Material to do practices

Arduino Leonardo or Arduino Mega (You also can use an Arduino UNO if you get it).

(The devices used with the Arduino Mega and Arduino Leonardo assembled inside have been: From the Ethernet PLCs; the M-Duino 21. From the 20I/Os PLC; The Ardbox Relay).