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Appendix E RS-485 Network E-
3
Appendix E
E.1 Basic Network Layout
Multi-drop RS-485 implies that there are two main wires in a segment.
The connected modules are connected by the so called drop cables, and
all the connections are in parallel. As a result, connecting or
disconnecting of a node doesn’t affect the network as a whole. Since
ADAM modules use the RS-485 standard with an ASCII-based
commands set, they can connect and communicate with all the ASCII-
based computers and terminals. The basic layouts that can be used for an
RS-485 network are:
Daisychain
The last module of a segment is a repeater, and it is directly connected to
the main-wires. Therefore, it acts as a medium which repeats the signals
between two segments. However, there is a limitation towards this
topology. It can only sustain up to 32 addressable modules. If more
modules per segment are used, the IC driver current will rapidly decrease
which may cause communication errors. Furthermore, the entire network
can only hold up to 256 addressable modules because of the limitation of
two numbered hexadecimal representation. The maximum representation
of two numbered hexadecimal representation is 256. The ADAM
converter, repeaters and the host computer are non addressable units;
therefore, they are not included in these numbers.
Figure E-1 Daisychaining
Summary of Contents for ADAM 4100
Page 1: ...ADAM 4100 Industrial Grade Data Acquisition Modules User s Manual ...
Page 5: ...Introduction 1 ...
Page 9: ...Installation Guideline 2 ...
Page 24: ...I O Modules 3 ...
Page 25: ......
Page 37: ...Chapter 3 I O Modules 3 13 I O Modules Figure 3 10 Digital Output used with SSR ADAM 4150 ...
Page 40: ...Command Set 4 ...
Page 41: ......
Page 51: ......
Page 105: ...Calibration 5 ...
Page 109: ...5 4 ADAM 4100 Series User s Manual ...
Page 110: ...Utility Software A ...
Page 111: ......
Page 121: ...ADAM 4100 I O Modbus Mapping Table B ...
Page 131: ...Technical Diagrams C ...
Page 134: ...C 4 ADAM 4100 Series User s Manual Appendix C Figure C 3 DIN Rail Mounting ...
Page 136: ...C 6 ADAM 4100 Series User s Manual Appendix C Figure C 5 Panel Mounting ...
Page 138: ...Data Formats and I O Ranges D ...
Page 142: ...RS 485 Network E ...
Page 143: ......
Page 150: ...How to use the Checksum feature F ...
Page 154: ...Changing Configuration to Modbus Protocol G ...