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D-2
ADAM-5511
RS-485 Network
EIA RS-485 is the industry’s most widely used bidirectional, balanced
transmission line standard. It is specifically developed for industrial
multi-drop systems that should be able to transmit and receive data at
high rates or over long distances.
The specifications of the EIA RS-485 protocol are as follows:
•
Maximum line length per segment: 1200 meters (4000 feet)
•
Throughput of 10 Mbaud and beyond -Differential transmission
(balanced lines) with high resistance against noise
•
Maximum 32 nodes per segment
•
Bi-directional master-slave communication over a single set of
twisted-pair cables
•
Parallel connected nodes, true multi-drop
ADAM-5510/P31 systems are fully isolated and use just a single set of
twisted pair wires to send and receive! Since the nodes are connected
in parallel they can be freely disconnected from the host without
affecting the functioning of the remaining nodes. An industry stan-
dard, shielded twisted pair is preferable due to the high noise ratio of
the environment.
When nodes communicate through the network, no sending conflicts
can occur since a simple command/response sequence is used. There
is always one initiator (with no address) and many slaves (with
addresses). In this case, the master is a personal computer that is
connected with its serial, RS-232, port to an ADAM RS-232/RS-485
converter. The slaves are the ADAM-5510/P31 systems. When
systems are not transmitting data, they are in listen mode. The host
computer initiates a command/response sequence with one of the
systems. Commands normally contain the address of the module the
host wants to communicate with. The system with the matching
address carries out the command and sends its response to the host.
Summary of Contents for ADAM-5511
Page 1: ...1 Introduction ...
Page 2: ......
Page 19: ...0 Quick Start Chapter ...
Page 35: ...1 Introduction Chapter ...
Page 39: ...2 System Specifications Chapter ...
Page 45: ...3 Installation Guidelines Chapter ...
Page 57: ...4 I O Modules Chapter ...
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Page 111: ...5 Programming and Downloading Chapter ...
Page 143: ...6 Function Library Chapter ...
Page 153: ...ADAM 5511 6 11 Chapter 6 ADAMdelay 1000 WDT_clear WDT_disable Remarks None ...
Page 161: ...ADAM 5511 6 19 Chapter 6 SetRTCtime RTC_hour hour Remarks None ...
Page 163: ...ADAM 5511 6 21 Chapter 6 printf nNode number Error Remarks None ...
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Page 297: ...A COM Port Register Structure Appendix ...
Page 301: ...B Data Formats and I O Ranges Appendix ...
Page 312: ...B 12 ADAM 5511 Data Formats and I O Ranges This page is blank ...
Page 313: ...C Examples on CD Appendix ...
Page 315: ...D RS 485 Network Appendix ...
Page 323: ...E Grounding Reference Appendix ...
Page 330: ...E 8 ADAM 5511 Grounding Reference Figure E 6 wire impedance ...