vii ADAM-5560 Series User Manual
A.1 RS-485 Networks........................................................ .... ... ... ... .............168
A.2 Basic Network Layout ........................................................................... 168
Figure A.1 Daisy chaining...................................... ...................169
Figure A.2 St ar Structure.. ....................................................... 169
Figure A.3 Random st ructure................................................... 170
A.3 Line Termination .................................................................................. 170
Figure A.4 Signal D istortion ..................................................... 170
Figure A.5 Termination Resist or Locations.............................. 171
A.4 RS-485 Data Flow Control............. ....................................................... 172
Figure A.6 RS-485 Data Flow Control w ith 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 G rounding Bar........................................ ................175
Figure B.3 Normal and C ommon Modes..................................175
B.2.3 Normal Mode and Common Mode............................................ 176
Figure B.4 Normal and C ommon 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 G rounding (1)..................................... 177
Figure B.8 Single Point G rounding (2)..................................... 178
B.3 Shielding ............................................................................................... 178
B.3.1 Cable Shield.............................................................................. 178
Figure B.9 Single I solated 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