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 by
Bob Perrin
Start
• Arm Yourself • RS-485
101 • Getting Grounded • Shielding
• Topology • Termination
• Idle-state Biasing • Transients
• Review Time • Sources
SOURCES
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the PDF of this Article.
Bob Perrin spends his days designing
general-purpose C-programmable embedded controllers and troubleshooting
customer system-level problems for Z-World (www.zworld.com).
Over the last ten years, Bob has designed instrumentation for agronomy,
soil physics, and water activity research. He was also the lead design
engineer for an intrinsically safe line of workstations for use in explosive
gas and particulate environments (class 1, divisions 1 and 2). For more
articles by Bob, visit his online library at www.engineerbob.com.
REFERENCES
[1] J. Goldie, Ten Ways to Bulletproof
RS-485 Interfaces, National Semiconductor, App note AN-1057, 1996.
[2] Robust DataComm, Grounding and
RS-422/485 (No Free Lunch!), Robust DataComm, App note 5, 1997.
[3] R. Morrison, Grounding and Shielding
Techniques in Instrumentation, 3d ed., Wiley and Sons, New York,
NY, 1986.
[4] R. Morrison, Solving Interference
Problems in Electronics, Wiley and Sons, New York, NY, 1995.
[5] Robust DataComm, Surge Management,
Robust DataComm, App note 18, 1997.
[6] H.W. Ott, Noise Reduction Techniques
in Electronic Systems, 2d ed., Wiley and Sons, New York, NY, 1988.
[7] J. Vo, A Comparison of Differential
Termination Techniques, National Semiconductor, App note AN-903,
1993.
[8] J. Goldie, Failsafe Biasing of
Differential Buses, National Semiconductor, App Note AN-847, 1992.
RS-485 cable
Alpha Wire Co.
(800) 522-5742
(908) 985-8000
Fax: (908) 925-6923
www.alphawire.com
Belden Wire and Cable Co.
(800) 235-3361
(765) 983-5200
Fax: (765) 983-5294
www.belden.com
TransZorb
General Semiconductor
(516) 847-3113
Fax: (516) 847-3236
www.gensemi.com
MAX3095
Maxim Integrated Products
(408) 737-7600
Fax: (408) 737-7194
www.maxim-ic.com
NSG-435 ESD gun
Schaffner EMC, Inc.
(973) 379-7778
www.schaffner.com
TI 75175
Texas Instruments, Inc.
(800) 477-8924, x4500
(972) 995-2011
Fax: (972) 995-4360
www.ti.com
TIA/EIA-485-A, TSB89-Application
guidelines for TIA/EIA-485-A
Global Engineering Documents
(800) 854-7179
(303) 397-7956
Fax: (303) 397-2740
global.ihs.com
National Semiconductor
(408) 721-5000
Fax: (408) 739-9803
www.national.com
Robust DataComm, Inc.
(612) 628-0533
www.robustdc.com
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THE
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