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vii ADAM-5560 Series User Manual
A.1 RS-485 Networks.................................................................................. 168
A.2 Basic Network Layout ........................................................................... 168
Figure A.1 Daisychaining ......................................................... 169
Figure A.2 Star Structure ......................................................... 169
Figure A.3 Random structure................................................... 170
A.3 Line Termination .................................................................................. 170
Figure A.4 Signal Distortion ..................................................... 170
Figure A.5 Termination Resistor Locations.............................. 171
A.4 RS-485 Data Flow Control .................................................................... 172
Figure A.6 RS-485 Data Flow Control with RTS...................... 172
Chapter B Grounding Reference ......................173
B.1 Field Grounding and Shielding Applications ......................................... 174
B.2 Grounding ............................................................................................. 174
B.2.1 The ‘Earth’ for reference ........................................................... 174
Figure B.1 Think the EARTH as GROUND.............................. 174
B.2.2 The ‘Frame Ground’ and ‘Grounding Bar’................................. 175
Figure B.2 Grounding Bar ........................................................ 175
Figure B.3 Normal and Common Modes.................................. 175
B.2.3 Normal Mode and Common Mode............................................ 176
Figure B.4 Normal and Common Modes.................................. 176
B.2.4 Wire Impedance........................................................................ 176
Figure B.5 High Voltage Transmissions................................... 176
Figure B.6 Wire Impedance ..................................................... 177
B.2.5 Single Point Grounding............................................................. 177
Figure B.7 Single Point Grounding (1) ..................................... 177
Figure B.8 Single Point Grounding (2) ..................................... 178
B.3 Shielding ............................................................................................... 178
B.3.1 Cable Shield.............................................................................. 178
Figure B.9 Single Isolated Cable.............................................. 178
Figure B.10Double Isolated Cable............................................ 179
B.3.2 System Shielding ...................................................................... 180
Figure B.11System Shielding.................................................... 180
Figure B.12Cable Characteristics ............................................. 180
Figure B.13System Shielding (1) .............................................. 181
Figure B.14System Shielding (2) .............................................. 181
B.4 Noise Reduction Techniques ................................................................ 182
Figure B.15Noise Reduction Techniques ................................. 182
B.5 Check Point List .................................................................................... 182
Chapter C Reference Documents.....................183
C.1 Reference Documents .......................................................................... 184
C.2 Topics for Getting Familiar with Multiprog............................................. 184