What is the difference between rs422 and rs485

That depends on selecting the communication chip of the controller and the communication chip of the converters. Generally, there are 32, 64, , and This kind of choice is the theoretical number.

In actual application, according to the scene environment, communication distance, and other factors, the number of loads does not reach the number of indicators. The micro-farming company controller and converter are designed in units, and it is actually recommended that the customer control each bus within 80 units. Each controller device must be hand-in-hand, and there must be no star connection or fork.

If there is a star connection or a fork, the interference will be substantial, the communication will be poor, and even the transmission will not be possible. They are all serial communication protocols and are ubiquitous device interfaces.

Serial interfaces are widely used in electronics and embedded systems, often for remote acquisition of device data or remote control. They change the way the signal is transmitted, whether it is a PC, microcontroller, or serial communication using serial communication protocols or TTL level transmission.

Typo: RS can work and receive without full-duplex operation through two pairs of twisted pairs. Should read: RS can work and receive with full-duplex operation through two pairs of twisted pairs.

Make sure that the converter has intelligent control of the transmitters so that it will automatically take care of the switching for you and will be transparent to the user.

Then, program the device as you would an rs or rs device. One such device is our model cat Are these comm. There is lot of difference between them. All of them are used for different purpose and should not be combined. You must be logged in to post a comment. Remember me Log in. Lost your password? RS Features RS is one of the mainstream serial communication interfaces. Due to the early appearance of the RS interface standard, it is inevitable that there are deficiencies, mainly the following four points: 1 The signal level of the interface is high, which is easy to damage the chip of the interface circuit.

RS Overview The RS serial bus is widely used when the communication distance must be several tens of meters to several kilometers. Call us at Contact us for detailed inquiries. Learn More. Jump to Section. Technical Learning. Talk with our Experts. Twisting wires twisted pair with each other allows you to get rid of interference and interference, because the interference acts equally on both wires, and the information is extracted from the potential difference between the conductors A and B of one line.

Logical 1 corresponds to the difference between A and B less than The RS standard does not define a specific type of connector, usually it can be a terminal block or a DB9 connector.

RS pinout depends on the manufacturer of the device and is specified in the documentation for it. Because the distance between the receiver and the transmitter RS can reach meters, then to prevent reflection of the signal from the end of the line, a special ohm termination resistor or "terminator" is put.

Then you can use the software to work with the COM port. Description of the RS interface In industry, the most common interface is RS EIA , because the RS uses a multi-point topology, which allows you to connect several receivers and transmitters.

The RS interface is similar to the RS in that it also uses a differential signal for data transmission. There are two types of RS RS with 2 contacts, operates in half duplex mode RS with 4 contacts, operates in full duplex mode In full duplex mode, you can simultaneously receive and transmit data, and in half-duplex mode either transmit or receive.

In one segment of the RS network there can be up to 32 devices, but with the help of additional repeaters and signal amplifiers up to devices. At one time, only one transmitter can be active. The RS standard does not define a specific type of connector, but it is often a terminal block or a DB9 connector.

The pinout of the RS connector depends on the manufacturer of the device and is specified in the documentation for it. Connect RS devices with 2 contacts. Due to the differential data transmission standards both in comparison to, for example, RS are well protected with only one data line and ground to external electric fields, as einkoppelnde DC voltages do not affect the differential signal.

Nevertheless, always shielded cables should be used to prevent a faulty transmission. The management of the RS bus in the network must always be used by only one unit.

The control is in this case generally a master to the traffic controls in the network and each slave responds. To enable this control addressing of individual devices is necessary that does not provide the RS standard. Why can not a network with RS devices are built.

When installing an RS device in a RS bus network should also be noted that a RS device RS bus network so heavily loaded as 3 RS devices, ie the maximum number of devices per station decreases.