If Rs485 Cable Is So Bad, Why Don't Statistics Show It? > 자유게시판

Our Security Solutions was created to provide commercial security products from latest technologies. But You stated you are going to install this at a commercial setting, so it always better to use the worst case environment situations, and use shielded cable. This robustness is the main reason why RS-485 is well suited for long-distance networking in noisy environment. Converters between RS-485 and RS-232 are available to allow a personal computer to communicate with remote devices. Because a mark (logic 1) condition is traditionally represented (e.g. in RS-232) with a negative voltage and space (logic 0) represented with a positive one, A may be considered the non-inverting signal and B as inverting. For an on, space or logic 0 state, the driver's A terminal is positive relative to the B terminal. A (green, negative) is higher than B (red, positive). TXsoil is a compact and low consumption sensor that can measure and transmit the humidity of the ground WiFi or RF or GSM. It is interesting to measure the humidity of the ground, but we have also thought about other things; and then we have TXtemp to measure the temperature (one of the uses of TXtemp is in association with SuperClock), and for practically any type of measurement we have TXdata (RS232, RS485 ModBus) - which can be connected to thousands of existing third-party professional RS232 or ModBus meters (and there is something for all needs: temperature and humidity meters, anemometers, voltage meters, energy, light meters, water meters, presence sensors, brightness sensors, soil humidity sensors, etc. ; practically all professional meters are available in ModBus or RS232 standard; and not just meters).

Electronic Industries Association (1983). Electrical Characteristics of Generators and Receivers for Use in Balanced Multipoint Systems. PLC systems are used to monitor and control operations, while HMI network systems allow interaction with machinery and control them. With your RS485 network, you can remotely monitor and control that pump from a control center. The PLC is programmed to monitor the level of the water in the vessel. All of this allows you to speed up the VFD that controls the speed of that water pump. Let’s say you were monitoring a water pump filling a vessel. Let’s talk about what we now know about RS485. RS485 can handle up to 32 connected devices. Another advantage over RS232 that I mentioned earlier is the number of connectable devices. You aren’t limited to fifty feet of cable like with RS232. Control and monitoring systems: A single pair of rs485 signal cable can connect up to 32 devices, with a signal transmission distance of up to 1200m. Therefore, using rs485 cables is an ideal choice for industrial control and monitoring systems, especially those with large-scale and high dispersion. Anti-inteference layer: Rs485 cables are designed with 2 anti-inteference layers to shield the internal conductors.

Rs485 cable is essentially a signal cable with a twisted pair structure, additionally shielded with 2 layers of noise protection used in industrial communication. The configuration and specifications of RS485 make it faster and extend the range of data transmission. The termination also includes pull up and pull down resistors to establish fail-safe bias for each data wire for the case when the lines are not being driven by any device. This includes speed control using Variable Frequency Drives (VFD) or inverters, as well as controlling simple PLC and HMI network systems. A simple network of a PLC, VFD, and an HMI allows remote control of motors in an industrial setting. This allows RS-485 to implement linear bus topologies using only two wires. In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. RS-485 signals are used in a wide range of computer and automation systems. RS-422 and RS-485 Standards Overview and System Configurations, Application Report (pdf). Stable connections play a crucial role in managing and controlling access to secure areas, optimizing system performance. Access control systems: Rs485 cables are mainly used to connect and transmit data between access control devices such as security gates, RFID cards, or time attendance machines and the control center.

Think of RS485 as the younger, faster brother of RS232. It is faster and much more versatile than the older RS232. Much like RS232, RS485 doesn’t have an actual standard connector. The PLC is also connected to the VFD via RS485. This is possible since the HMI is connected to your PLC via RS485. This makes utilizing RS485 simple. The greatest feature of RS485 is the fact that you can connect up to 32 devices on one system. What made it such an advancement over RS232 was the fact that it could transmit not only a single device to device transmission, but also a communications bus to connect multiple devices at once. Problem solved thanks to RS485 communications. Therefore for RS485 communications no crossover cable is used. The maximum RS485 cable length is typically listed as 1200 meters or about 4000 feet. I used male-female terminated wires & crimp housings to make this little jumper cable to drive the board with SPI transfers.