ADAM-5511
D-3
Appendix D
D.1 Basic Network Layout
Multi-drop RS-485 implies that there are two main wires in a segment.
The connected systems tap from these two lines with so called drop
cables. Thus all connections are parallel and connecting or discon-
necting of a node doesn’t affect the network as a whole. Since
ADAM-5510/P31 systems use the RS-485 standard, they can connect
and communicate with the host PC. The basic layouts that can be used
for an RS-485 network are:
Daisychain
The last module of a segment is a repeater. It is directly connected to
the main-wires thereby ending the first segment and starting the next
segment. Up to 32 addressable systems can be daisychained . This
limitation is a physical one. When using more systems per segment the
IC driver current rapidly decreases, causing communication errors. In
total, the network can hold up to 64 addressable systems. The limita-
tion on this number is the two-character hexadecimal address code that
can address 64 combinations. The ADAM converter, ADAM repeaters
and the host computer are non addressable units and therefore are not
included in these numbers.
Figure D-1:
Daisychaining
Coverter
RS232/RS485
RS-232
RS-485
Repeater
1
Segment 2
Segment 1
1
2
N
1
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 ...
Page 110: ...4 54 ADAM 5511 I O Modules This page inyrntionally left blank ...
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 ...
Page 169: ...ADAM 5511 6 27 Chapter 6 write_user_ram 0 Remarks None ...
Page 171: ...ADAM 5511 6 29 Chapter 6 Remarks None ...
Page 175: ...ADAM 5511 6 33 Chapter 6 Remarks None ...
Page 211: ...ADAM 5511 6 69 Chapter 6 Remarks None ...
Page 219: ...ADAM 5511 6 77 Chapter 6 Remarks None ...
Page 223: ...ADAM 5511 6 81 Chapter 6 printf start failed n Remarks None ...
Page 242: ...6 100 ADAM 5511 Function Library Remarks None ...
Page 244: ...6 102 ADAM 5511 Function Library Remarks None ...
Page 246: ...6 104 ADAM 5511 Function Library Remarks None ...
Page 248: ...6 106 ADAM 5511 Function Library Remarks None ...
Page 250: ...6 108 ADAM 5511 Function Library printf nAdam 4017 channel3 d data17 Remarks None ...
Page 252: ...6 110 ADAM 5511 Function Library printf nAdam 4018 channel3 d data18 Remarks None ...
Page 254: ...6 112 ADAM 5511 Function Library Remarks None ...
Page 260: ...6 118 ADAM 5511 Function Library printf nAdam 4080 channel2 d Idata80 Remarks None ...
Page 264: ...6 122 ADAM 5511 Function Library This page is blank ...
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 ...