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E-8
ADAM-5510/P31
RS-485 Network
Thus as already stated above the line termination resistor R
T
will
normally equal the characteristic impedance Z
o
.
The star connection causes a multitude of these discontinuities since
there are several transmission lines and is therefore not recommend.
Note:
The recommend method wiring method, that causes
a minimum amount of reflection, is daisy chaining
where all receivers tapped from one transmission line
needs only to be terminated twice.
E.3 RS-485 Data Flow Control
The RS-485 standard uses a single pair of wires to send and receive
data. This line sharing requires some method to control the direction of
the data flow. RTS (Request To Send) and CTS (Clear To Send) are the
most commonly used methods.
Figure E-6:
RS-485 data flow control with RTS
Intelligent RS-485 Control
ADAM-4510 and ADAM-4520 are both equipped with an I/O circuit
which can automatically sense the direction of the data flow. No
handshaking with the host (like RTS, Request to Send) is necessary to
receive data and forward it in the correct direction. You can use any
software written for half-duplex RS-232 with an ADAM network
without modification. The RS-485 control is completely transparent to
the user.
Summary of Contents for ADAM-5510/P31
Page 17: ...0 Quick Start...
Page 38: ...0 22 ADAM 5510 P31 Quick Start...
Page 39: ...1 Introduction...
Page 43: ...2 Installation Guidelines...
Page 52: ...2 10 ADAM 5510 P31 Installation Guideline Figure 2 10 ADAM 5510 P31 network address DIP switch...
Page 58: ...2 16 ADAM 5510 P31 Installation Guideline...
Page 59: ...3 System Specifications...
Page 65: ...4 I O Modules...
Page 116: ...4 52 ADAM 5510 P31 I O Modules...
Page 117: ...ADAM 5510 P31 5 1 Chapter 5 5 Troubleshooting...
Page 129: ...ADAM 5510 P31 A 1 Appendix A A Quick Start Example...
Page 132: ...A 4 ADAM 5510 P31 Quick Start Example...
Page 133: ...ADAM 5510 P31 B 1 Appendix B B COM Port Register Structure...
Page 137: ...ADAM 5510 P31 C 1 Appendix C C Data Formats and I O Ranges...
Page 147: ...D Performance...
Page 173: ...E RS 485 Network...
Page 181: ...ADAM 5510 P31 F 1 Appendix F F ADAM 4000 5000 System Grounding Installation...
Page 187: ...ADAM 5510 P31 G 1 Appendix G G Grounding Reference...