Serial Port Complete - Latest Microcontroller projects
Chapter 7 increasing the initial received voltage. In extreme cases, a mismatch can cause reflections so large that they damage ...
Designing RS-485 Links and Networks data cuts power consumption dramatically. A circuit that uses spare RS-232 sig- nals as a po ...
Chapter 7 input A more positive than input B. Adding a termination lowers the open-cir- cuit differential voltage to just a few ...
Designing RS-485 Links and Networks The amplitude of the ringing varies with the driver’s output resistance, the wires’ inductan ...
Chapter 7 Figure 7-8: These terminations can conserve power on some lines. ...
Designing RS-485 Links and Networks remains charged and the receiver’s internal pull-up and pull-down resistors hold input A > ...
Chapter 7 Figure 7-9: Network nodes can connect using any of several wiring topologies. ...
Designing RS-485 Links and Networks tion between two nodes is a separate RS-485 line. The distance around a ring is unlimited in ...
Chapter 7 Biasing the entire network requires one pair of resistors. Networks that use a primary/secondary protocol typically pl ...
Designing RS-485 Links and Networks much larger than the biasing current, the opposing bias current doesn’t change the logic lev ...
Chapter 7 ! " Another concern in RS-485 links is ensuring a logic-1 input if the network wires accidentally ...
Designing RS-485 Links and Networks R4 protect the receiver and ensure that the input remains biased even if the wires short tog ...
Chapter 7 9 - . Understanding how a twisted pair cancels noise requires knowing something about how noise ...
Designing RS-485 Links and Networks When wires are greater than 1/6 wavelength apart (1/4 mile at 10 MHz), the effects of the ca ...
Chapter 7 combination to 50Ω., less than TIA-485-A’s specified minimum. Most RS-485 drivers can source and sink 60 mA and thus w ...
Designing RS-485 Links and Networks In some RS-485 circuits, all of the nodes and the cable that connects them share a common gr ...
Chapter 7 in the ground connection. For example, if the driver’s outputs are +5V and 0V relative to the driver’s ground, and the ...
Designing RS-485 Links and Networks blocks this substrate current and allows the active driver to co-exist with dis- abled drive ...
Chapter 7 path of least resistance. If the power supplies of all nodes use the same electrical system and their ground wires con ...
Designing RS-485 Links and Networks the cable’s ground wire. Isolating the link can reduce or eliminate these prob- lems. TIA-48 ...
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