Serial Port Complete - Latest Microcontroller projects
Chapter 6 $ $ The ideal driver-enable control requires no software control, no user ...
Inside RS-485 One way to ensure that a driver is disabled by the end of the Stop bit is to derive the driver-enable signal from ...
Chapter 6 in most networks don’t respond immediately after the Stop bit so a slightly longer delay causes no harm. To reduce the ...
Inside RS-485 The 1-shot uses the Start bit to detect when a byte begins to transmit. Each byte begins with a falling edge that ...
This page intentionally left blank ...
7 ()* %& , & In RS-485 communications, the choice of cables and components can mean the differe ...
Chapter 7 RS-485 can connect anywhere from 2 to over 200 computers. The bit rate can be as slow as 300 bps ...
Designing RS-485 Links and Networks 5 Rise time is the time required for an output to switch from 10% to 90% of full ...
Chapter 7 wave is the sum of a 100-Hz fundamental plus harmonics of 300, 500, 700 Hz and so on up. Figure 7-2 illustrates. A squ ...
Designing RS-485 Links and Networks Light in a vacuum travels 300 million meters/s (186,000 miles/s or 12 in./ns). An electrical ...
Chapter 7 Public Function IsLongLine (ByVal propagationRate As Integer, ByVal cableLength As Integer, ByVal driverRiseTime ...
Designing RS-485 Links and Networks Public Function MaximumLengthOfShortLine (ByVal propagationRate As Integer, ByVal drive ...
Chapter 7 above example to 222 ft. The chip is rated for use at up to 115,200 bps, which is fast enough for many PC and microcon ...
Designing RS-485 Links and Networks Characteristic impedance is important because a driver initially sees a transmis- sion line ...
Chapter 7 Most RS-485 lines use an end termination consisting of a resistor equal to the characteristic impedance connected acro ...
Designing RS-485 Links and Networks TIA-485-A says that RS-485 drivers must be able to drive 32 unit loads plus a parallel termi ...
Chapter 7 In all cases, the reflections happen quickly, during and just after an output switches. But on a long line, the reflec ...
Designing RS-485 Links and Networks ance of an infinite, open line, and is equal to the line’s characteristic impedance. The val ...
Chapter 7 If the line has a termination but the value is greater than the characteristic impedance, the effect is similar but le ...
Designing RS-485 Links and Networks rounds with each round of lower amplitude than previous rounds. Eventually the current settl ...
«
2
3
4
5
6
7
8
9
10
11
»
Free download pdf