이름 : Cecil
이메일 : cecilnevile@yahoo.com
연락처 :
예식일 : Since RS-485 is a Multi-point Specification
문의내용:

2) the GSM version also allows you to indicate a possible PIN (leave blank if there is no PIN) and the operator's APN (possibly you can search for it on Google). Utilizing a series of dedicated interface devices, it allows PCs and industrial controllers to communicate. These are used in programmable logic controllers and on factory floors. It has a special capacitive sensor designed by us, efficient and of good precision, waterproof, resistant to oxidation and not subject to variations due to salinity and soil composition: better than this there are only the "extraction pressure" sensors (which we do not propose because they are not durable and also the sensor alone costs hundreds of euros). We tried to build an organic system so that whoever gets a TXtemp, TXsoil sensor or a bridge for RS232 or ModBus sensors and devices like TXdata can immediately use them without wasting time in configurations (and we also took the opportunity to insert some things into our system some "extra" not foreseen by the standards!). If there are several sensors near and/or other data to be transmitted via GSM, it is more convenient to use Standard / RF versions supported on a concentrator or controller such as RXTXeasy GSM so you will be able to use one single SIM.

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). TXsoil is a compact and low consumption sensor that can measure and transmit the humidity of the ground WiFi or RF or GSM. This with WiFi transmission for the Standard version, and in the RF version also with radio transmission at 433MHz (covering longer distances and with less battery consumption thanks to special optimizations). 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. The standard does not discuss cable shielding but makes some recommendations on preferred methods of interconnecting the signal reference common and equipment case grounds.

SC, G or reference, rs485 cable the common signal reference ground used by the receiver to measure the A and B voltages. Interoperability of even similar devices from different manufacturers is not assured by compliance with the signal levels alone. A Modbus RS485 connects a Master device to one or more Slave devices. However this contradicts the facts that an idle mark state is a logical one and the termination polarization puts B at a higher voltage in Profibus guidelines. 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. The RS485 system used for Modbus communication provides a main cable (Bus or backbone), to which all the devices have to be connected with branches (also known as stubs) that are as short as possible. This robustness is the main reason why RS-485 is well suited for long-distance networking in noisy environment.

PC environment. 8P8C modular connectors are used in this case. Converters between RS-485 and RS-232 are available to allow a personal computer to communicate with remote devices. RS-485 is also used in building automation as the simple bus wiring and long cable length is ideal for joining remote devices. It requires minimal wiring and can share the wiring among several seats, reducing weight. RS-485, like RS-422, can be made full-duplex by using four wires. In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. Although many applications use RS-485 signal levels, the speed, format, and protocol of the data transmission are not specified by RS-485. The twin consists of two conductors that are twisted together. Each device has a communication port with two terminals, which are indicated for the sake of convenience as A and B. In these two terminals the communication cable is connected so that all the devices that take part in the communication are connected in parallel. In order to avoid errors when many devices are connected, cables of the same colour should be used for all the connections to the terminals A and cables of the same colour should be used for all the connections to the terminals B of the various devices (e.g. white for A and blue for B).