Abstract: the RS485 bus application in intelligent instrument communication system the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The 21st century, the RS485 serial communication technology has been widely used in industrial control industry. Now the world's basic monopoly by intelligent instrument instrument market. The reason is the need of enterprise information, enterprise in one of the necessary conditions for model selection of the instrument is to have connected to the Internet. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the RS485 bus application in the intelligent instrument communication system the article details. The 21st century, the RS485 serial communication technology has been widely used in industrial control industry. Now the world's basic monopoly by intelligent instrument instrument market. The reason is the need of enterprise information, enterprise in one of the necessary conditions for model selection of the instrument is to have a network communication interface. RS485 interface can realize point-to-point communication and can be connected to the Internet, so the RS485 in intelligent instrument communication flow zui 'used in the system. RS - 485 interface communication link simply with A pair of twisted pair to each interface of 'A', 'B' side. While ignoring the signal ground connection, the connection method is to work on many occasions, but planted a lot of hidden trouble, there are two reasons for this: ( 1) Common-mode interference problem: RS - 485 interface adopts differential mode transmission method, need not relative to a reference point to detect signals, by detecting the potential difference between the two line system. But people often ignores the transceiver has certain common mode voltage range, the RS - To - 485 transceiver common-mode voltage range 7 ~ + 12 v, only to meet the above conditions, the whole networks to work properly. When the common-mode voltage of the communist party of China is beyond the scope of network lines can affect communication is stable and reliable, even damage the interface. （ 2) The common mode EMI problem: send driver output signal part need a return path, if not a return channel (low resistance Signal ground) , will return in the form of radiation source side, the whole bus would be like a giant antenna to the radiation electromagnetic waves. UT- 2127 passive photoelectric isolation type interface converter, compatible with RS - 232C、RS- 422年,RS - An RS - 485 standard, able to RS - 232 signal is converted into a balanced differential Or RS - 422 485 signal, the built-in optoelectronic isolator, can provide up to 2500 VRMS isolation voltage, with fast transient voltage suppression protector, this protector is designed to protect the RS - 422 / RS - 485 interface, using today's advanced TVS ( TRANSIENT VOLTAGE SUPPRESSOR） Transient voltage suppressor, under normal circumstances, TVS tube in high impedance state, when TVS tube ends through instant high energy impact, it can bring its both ends at very high speed of impedance is reduced, to absorb a large current, and the voltage at the ends of the muzzle on a predetermined value, to protect the back of the circuit components due to transient high pressure shock damage. The protector can effectively inhibit the lightning ( 闪电) And ESD, providing 600 w per line lightning surge protection of power, and the surge voltage and the various reasons on transient overvoltage, and tiny electrode capacitance RS - is guaranteed 422 / RS - 485 high-speed transmission interface. RS - 232 interface end by a female DB9 head connector and compatible RS - 232 c standard interface is linked together, the RS - 422年,RS - End by six terminal to the output end of 485. Inside the converter with zero delay transmit-receive automatically, the automatic I/O circuit control data flow direction, without any handshake signals ( Such as the RTS, DTR, etc. ) , there is no need to jump line Settings to achieve full-duplex ( RS - 422). , half duplex ( RS - 485). Mode conversion, plug and play. Ensure that suitable for all the existing communication software and hardware interface, don't need to based on RS - before 232 works make any software changes. Product features: s interface features: interface compatible with the EIA/TIA RS - 232C、RS- 485 / RS - - 422 standard s electrical interface: RS 232 interface input DB9 female head connector, RS - 422 / RS - Six 485 interface terminal to output s level of protection: RS - + / - 232 interface RS - 15 kv ESD protection 422年,RS - 485 interface 600 w per line lightning surge protection. S isolation: isolation voltage dc 2500 VRMS 500 consecutive s works: asynchronous half-duplex or asynchronous full-duplex s transmission medium: twisted pair or shielded wire s transmission rate: 115. 2 k BPS to 300 m 38. 4 k BPS to 9600 BPS to 1 600 m. 2 km s shape size: 61 mm & times; 41毫米× 21 mm s use of the environment: - 40 ℃ to 85 ℃, relative humidity of 5% to 95% above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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