
ADAM-4000 Series User Manual
250
E.3
Line Termination
Each discontinuity in impedance causes reflections and distortion. When an imped
-
ance discontinuity occurs in the transmission line the immediate effect is signal
reflection. This will lead to signal distortion. Specially at line ends this mismatch
causes problems. To eliminate this discontinuity terminate the line with a resistor.
Figure E.4 Signal Distortion
The value of the resistor should be a close as possible to the characteristic imped
-
ance of the line. Although receiver devices add some resistance to the whole of the
transmission line, normally it is sufficient to the resistor impedance should equal the
characteristic impedance of the line.
Example:
Each input of the receivers has a nominal input impedance of 18 kW feeding into a
diode transistor- resistor biasing network that is equivalent to an 18 kΩ input resistor
tied to a common mode voltage of 2.4 V. It is this configuration which provides the
large common range of the receiver required for RS-485 systems! (See Figure E.5
below)
Figure E.5 Termination resistor locations
Содержание Adam - 4021
Страница 1: ...User Manual ADAM 4000 Series Data Acquisition Modules...
Страница 4: ...ADAM 4000 Series User Manual iv...
Страница 12: ...ADAM 4000 Series User Manual xii...
Страница 13: ...Chapter 1 1 Introduction...
Страница 16: ...ADAM 4000 Series User Manual 4...
Страница 17: ...Chapter 2 2 Installation Guideline...
Страница 33: ...Chapter 3 3 I O Modules...
Страница 36: ...ADAM 4000 Series User Manual 24 3 2 1 Application Wiring Figure 3 2 ADAM 4015 RTD Input Module Wiring Diagram...
Страница 78: ...ADAM 4000 Series User Manual 66...
Страница 79: ...Chapter 4 4 Command Set...
Страница 99: ...87 ADAM 4000 Series User Manual Chapter 4 Command Set...
Страница 100: ...ADAM 4000 Series User Manual 88...
Страница 101: ...Chapter 5 5 Analog Input Module Commands...
Страница 127: ...Chapter 6 6 Analog Output Module Commands...
Страница 144: ...ADAM 4000 Series User Manual 132...
Страница 145: ...Chapter 7 7 I O Relay Counter Frequency...
Страница 201: ...Chapter 8 8 Calibration...
Страница 206: ...ADAM 4000 Series User Manual 194...
Страница 207: ...Appendix A A Technical Specifications...
Страница 211: ...199 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 2 ADAM 4018 Function Diagram...
Страница 213: ...201 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 3 ADAM 4019 Function Diagram...
Страница 215: ...203 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 4 ADAM 4021 Function Diagram...
Страница 216: ...ADAM 4000 Series User Manual 204 Figure A 5 ADAM 4024 Function Diagram...
Страница 219: ...207 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 7 ADAM 4051 4052 Function Diagram...
Страница 221: ...209 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 8 ADAM 4053 Function Diagram...
Страница 223: ...211 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 9 ADAM 4055 Function Diagram...
Страница 225: ...213 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 10 ADAM 4056S Function Diagram...
Страница 227: ...215 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 11 ADAM 4056SO Function Diagram...
Страница 229: ...217 ADAM 4000 Series User Manual Appendix A Technical Specifications Figure A 12 ADAM 4060 Function Diagram...
Страница 232: ...ADAM 4000 Series User Manual 220 Figure A 14 ADAM 4080 Function Diagram...
Страница 233: ...Appendix B B Data Formats and I O Ranges...
Страница 244: ...ADAM 4000 Series User Manual 232...
Страница 245: ...Appendix C C Technical Diagrams...
Страница 246: ...ADAM 4000 Series User Manual 234 C 1 ADAM Dimensions Figure C 1 ADAM Modules Dimensions...
Страница 248: ...ADAM 4000 Series User Manual 236 Figure C 3 DIN Rail Mounting...
Страница 250: ...ADAM 4000 Series User Manual 238 C 2 3 Piggyback Stack Figure C 6 Piggyback Stack...
Страница 251: ...Appendix D D Utility Software...
Страница 258: ...ADAM 4000 Series User Manual 246...
Страница 259: ...Appendix E E RS 485 Network...
Страница 264: ...ADAM 4000 Series User Manual 252...
Страница 265: ...Appendix F F Using the Checksum Feature...
Страница 268: ...ADAM 4000 Series User Manual 256...
Страница 269: ...Appendix G G I O Modbus Mapping Table...
Страница 283: ...Appendix H H Changing to Modbus Protocol...
Страница 285: ...273 ADAM 4000 Series User Manual Appendix H Changing to Modbus Protocol...