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ADAM-5510/P31
E-7
Appendix E
Figure E-5:
Termination resistor locations
Because each input is biased to 2.4 V, the nominal common mode
voltage of balanced RS-485 systems, the 18 k
Ω
on the input can be
taken as being in series across the input of each individual receiver.
If thirty of these receivers are put closely together at the end of the
transmission line, they will tend to react as thirty 36k
Ω
resistors in
parallel with the termination resistor. The overall effective resistance
will need to be close to the characteristics of the line. The effective
parallel receiver resistance R
P
will therefore be equal to:
R
P
= 36 x 10
3
/30 = 1200
Ω
While the termination receptor R
T
will equal:
R
T
= R
O
/ [1 - R
O
/R
P
]
Thus for a line with a characteristic impedance of 100
Ω
resistor
R
T
= 100/[1 - 100/1200] = 110
Ω
Since this value lies within 10% of the line characteristic impedance.
Содержание ADAM-5510/P31
Страница 17: ...0 Quick Start...
Страница 38: ...0 22 ADAM 5510 P31 Quick Start...
Страница 39: ...1 Introduction...
Страница 43: ...2 Installation Guidelines...
Страница 52: ...2 10 ADAM 5510 P31 Installation Guideline Figure 2 10 ADAM 5510 P31 network address DIP switch...
Страница 58: ...2 16 ADAM 5510 P31 Installation Guideline...
Страница 59: ...3 System Specifications...
Страница 65: ...4 I O Modules...
Страница 116: ...4 52 ADAM 5510 P31 I O Modules...
Страница 117: ...ADAM 5510 P31 5 1 Chapter 5 5 Troubleshooting...
Страница 129: ...ADAM 5510 P31 A 1 Appendix A A Quick Start Example...
Страница 132: ...A 4 ADAM 5510 P31 Quick Start Example...
Страница 133: ...ADAM 5510 P31 B 1 Appendix B B COM Port Register Structure...
Страница 137: ...ADAM 5510 P31 C 1 Appendix C C Data Formats and I O Ranges...
Страница 147: ...D Performance...
Страница 173: ...E RS 485 Network...
Страница 181: ...ADAM 5510 P31 F 1 Appendix F F ADAM 4000 5000 System Grounding Installation...
Страница 187: ...ADAM 5510 P31 G 1 Appendix G G Grounding Reference...
Страница 202: ...G 16 ADAM 5510 P31 Grounding Reference...