![]() ![]() This is an important error detection method (it compares the 1's with the bit of parity to check if the transmission is successful.ġ/2 Bits of Stop: it is important to set 1 or 2 bits of the stop. It is important to set this correctly because the parity bit is a binary bit that indicates whether the number of bits with the value 1 in a group of bits is even, odd, or none. After that, we have to set the configuration parameters:Ĩ Data Bits: here you have to set how many data bits you have to work with.ġ Bit of Parity: here you have to write e (for even), o (for odd), or n (for nothing). If you put both images together, first of all, you can see that you have to set the Baudrate which is the communication speed of the port and it has to be the same in the Tx and Rx if they have to communicate through the same frequency channel. In the case of Half-Duplex communication, messages are always sent in the same format:Īnd, in the configuration of Arduino IDE for Serial you can see that you have to follow the next Syntax and Parameters (the configuration has to be set in the setup section and you can initialize as many serial ports as your working device has) : ![]() ![]() A slave cannot transmit if it has not been initialized by the master before, so direct transmission of information between the different slaves is not possible. To explain the configuration of the RS-485, we will take an example: the Sinamics V20 Converter from Siemens.Ī master PLC controller Arduino can connect a maximum of 31 converters (slaves) via a serial interface and control them with the USS serial bus protocol. Although Tx and Rx share the same frequency, Tx can only occur in one way simultaneously.įull Duplex allows transmission in both directions and for the same channel simultaneously, using two different frequencies one for Tx and another for Rx. Half Duplex allows transmission in both directions. The Simplex is a type of unidirectional transmission in which the Rx cannot respond to the Rx. ![]() There are three types of relations between the master and the slave from the point of view of the Tx and Rx (Transmitter and Reciever) the Simplex, the Full Duplex and the Half Duplex. There are many different communications but, in this one, the master is typically located in the center along with the RS-485 cable set, and two slaves are located at the physical end of the wires, making the terminations. Usually, when we talk about a master-slave arrangement, the master device initiates all the communication activity, providing itself the bias. Course - Programming Arduino on Industrial Environments.Course - Scada Application with Node-RED. ![]()
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