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How a lightning can affect a optical isolated RS 485 bus?

Updated: 4/28/2022

Ipacin ∙

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∙ 15y ago

Best Answer

Because of the very high voltage of lightning, an opto isolator can't block it, the best is to relay any lightning to ground but that is still not a guarantee that the spike will be stopped. Lightning voltage is in the Giga Volt range.

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Continue Learning about Electrical Engineering

What is the function of RS 485 connection?

The symmetrical pin layout of the RJ11 sockets on the Unitronics PLCs allows an easy way of interconnecting the PLCs with both RS232 and RS485 communications. For RS232a crossover cable is used where pin 1 is connected with pin 6 at the other connector, pin 2 with pin 5, etc. This interconnects the transmit and receive signals of both PLCs, and also the handshaking signals DTR and DSR. If handshaking is not necessary, an ordinary 4 wire telephone cable could be used, provided that the pins are cross-connected as shown in the picture below. Otherwise a full 6 wire cable must be used. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. Unitronics RJ11 RS232 crossover cableRJ11 plug 1RJ11 plug 2Function16DTRDSR25Signal ground34TxDRxD43RxDTxD52Signal ground61DSRDTRRS485 is in its design a different interface from RS232. The RS485 interface allows the creation of multipoint networks. The normal way to implement this is with a two wire system with differential signal levels. These signals are commonly called A and B in RS485 systems. The A signals of all devices should be connected with each other and the same goes for the B signals. Therefore for RS485 communications no crossover cable is used. To prevent noise to interfere with the communications, often twisted pair cable is used. The diagram below shows a basic RS485 cable for use with the RJ11 socket on Unitronics PLCs. You can easily connect more devices by splitting the cable at one connector and adding another cable to it.Unitronics RJ11 RS485 cableRJ11 plug 1RJ11 plug 2Function11A (+)A (+)

Related questions

What is 66.7 percent of 485?

66.7% of 485 = 66.7% * 485 = 0.667 * 485 = 323.495

What is 85 percent of 485?

85% of 485= 85% * 485= 0.85 * 485= 412.25

What are the factors for 485?

The factors of 485 are: 1, 5, 97, 485.

What is 485 percent as a fraction?

485% = 485/100 = 97/20 or 417/20

What are all the numbers that go into 485?

The factors of 485 are: 1, 5, 97, 485.

What is 492-485?

492-485 = 7

what is 485 x53?

485 x53 = 25705

Roman Numeral for 485?

485 = CDLXXXV

What is the prime factorization of 485?

The Prime Factors of 485 are 5, 97

What is the roman numeral for 485?

The conversion of 485 is 'CDLXXX.'Another contributor's answer:485 in Roman numerals is CDLXXXV

What is 485 divisible by?

1, 5, 97, 485

What are the factors of 485?

1, 5, 97, 485

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