If a Star Configuration is Unavoidable > 자유게시판

The RS232 (Recommended Standard 232) and RS2485 (Recommended Standard 485) are simple forms of serial communication protocols used to transmit and receive data. The recommended arrangement of the wires is as a connected series of point-to-point () nodes, a line or bus, Ideally, the two ends of the cable will have a termination resistor connected across the two wires. The data can be transmitted via serial or parallel, the main advantage of parallel communication is that the data can be transferred very fast and the disadvantages are cost per bit will be high and also the crosstalk between the wires will represent that there may be a greater chance of data corruption when transferring long distances. We will pull the enable pin high to put the MAX485 module in receiver mode. RS485 is made for serial communication with high speeds, support for long distances, and support for multiple devices (slaves). The RS485 is also a form of serial communication faster than RS232.

The difference between RS232 and RS485 mainly includes the basics of RS232 & RS484, and its main differences are listed in the tabular form. For a more detailed discussion read WHY YOU NEED 3 WIRES FOR 2 (TWO) WIRE RS485 FOR BACNET. RS-485, like RS-422, can be made full-duplex by using four wires. You can also still simply use a terminal strip. Remember this statement: The so-called Ground Terminal on an RS485 interface is not a connection to ground. This works well and prevents the existence of ground loops, a common source of communication problems. 2. Always connect the ground reference conductor first if you are connecting a device that is powered up or you are connecting your laptop to an operating network. 1. RS485 is a 3 conductor network. You take a huge risk by not installing the 3rd conductor. You risk blowing 485 ports, you risk unstable operation (works sometimes and doesn't work other times) and finally, you risk re-installation. The more power sources used to power devices, the greater the physical separation of devices, the less well-grounded devices, and power sources are the greater the risk. Those include, interface connector, mapping, interconnection, conversion, measurement, protection and power amplification hardware accessories.

It also features embedded circuits protection features such as power isolation, ADI magnetical isolation, and TVS diode. Here is a question for you, what are the features of RS232 and RS485? The specifications and configurations of RS485 make faster and extend the data transmission range. RS-485 signals are used in a wide range of computer and automation systems. RS-485 is used as the physical layer underlying many standard and proprietary automation protocols used to implement industrial control systems, including the most common versions of Modbus and Profibus. One common example that many people probably know that is a computer connected to a printer, the RS232 is widely used for printers in working places. It transmits signals from positive and negative voltages for binary 0 and binary 1. The standard form of DTE is Data Terminal Equipment, a common example of this is a computer. The standard form of DCE is Data Communication Equipment, a common example of this is a modem. It is a common reference signal. It is his reference to Art that makes RS485 bad. In a place where you are hindered by the electrically noisy environment, RS485 will be the optimal choice.

The voltage level on the Tx/Rx conductors are measured relative to this voltage level. For an on, space or logic 0 state, the driver's A terminal is positive relative to the B terminal. In place of a connector, terminal strips were used in some applications. Although many applications use RS-485 signal levels, the speed, format, and protocol of the data transmission are not specified by RS-485. If a star configuration is unavoidable, special RS-485 repeaters are available which bidirectionally listen for data on each span and then retransmit the data onto all other spans. The RS232 protocol allows the system or computer to give commands to the printer via a voltage signal, then the printer receives the commands and completes the print. It is versatile and faster than RS232, and the greatest feature of this standard is that you can connect up to 32 devices on one system. It is used for data storage, mouse, printers, modems, and many other peripheral devices.

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