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Appendix E

 

 

Appendix E RS-485 Network E-

3

 

 

E.1 Basic Network Layout  

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 modules can be diasychained . This 

limitation is a physical one. When using more modules per segment the 

IC driver current rapidly decreases, causing communication errors. 

Totally the network can hold up to 256 addressable modules. The 

limitation for this number is the two number hexadecimal address codes 

that knows 256 combinations. The 

MIR

 converter, M

IR

 repeaters 

and the host computer are non addressable units and therefore are not 

included in these numbers. 

 

Figure E-1

 Daisychaining 

 

 

 

Содержание MIR 6000 Series

Страница 1: ...MIR 6000 Controller and Data logger Modules User s Manual...

Страница 2: ...reproduced copied translated or transmitted in any form or by any means without the prior written permission of Tamam tadbir Co Ltd Information provided in this manual is intended to be accurate and...

Страница 3: ...Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolution Error 0 1 Sampling rate 1 samples second Max Input impedance Voltage 2 M C...

Страница 4: ...ccuracy 0 5 or better Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolution Error 0 1 Sampling rate 1 samples second Max Input im...

Страница 5: ...485 2 wire 38 4K 4000 ft 1200 m Accuracy 0 5 or better Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolution Error 0 1 Sampling...

Страница 6: ...s Maximum distance RS 485 2 wire 38 4K 4000 ft 1200 m Accuracy 0 5 or better Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolutio...

Страница 7: ...t 1200 m Accuracy 0 5 or better Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolution Error 0 1 Sampling rate 1 samples second Ma...

Страница 8: ...K Maximum distance 4000 ft 1200 m Accuracy 0 5 or better Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolution Error 0 1 Sampling...

Страница 9: ...r Zero drift 6 V C Span drift 25 ppm C Isolation rated voltage 3000 VDC CMR 50 60 Hz 150 dB NMR 50 60 Hz 100 dB A D resolution Error 0 1 Sampling rate 1 samples second Max Input impedance Voltage 2 M...

Страница 10: ...l ranges of voltage input or RTD input All of the module s configuration parameters including I O address HI and LO alarm calibration parameters settings may be set remotely Remote configuration can b...

Страница 11: ...may be connected to an RS 485 multi drop network by using the RS 485 repeater which extends the maximum communication distance up to 4 000 ft The host computer is connected to the RS 485 network with...

Страница 12: ...environment MIR modules low power requirements help them to operate in temperatures from 0 to 50 and in humidity from 0 to 90 non condensing They are compactly built using automated SMT technology The...

Страница 13: ...Installation Guideline 2...

Страница 14: ...MIR network The following list gives an overview of what is needed to setup install and configure an MIR environment MIR modules A host computer such as an IBM PC AT compatible that can output ASCII...

Страница 15: ...Small systems may be powered by using wall mounted modular power supplies Also when modules operate in long communication lines 500 feet it is often more reliable to obtain power locally through modu...

Страница 16: ...ommunication Wiring We recommend the use of shielded twisted pair cable in the MIR network for reducing interference purpose but the cable has to comply with the EIA RS 485 standard Furthermore only o...

Страница 17: ...in 38 4 Kbps for all modules RS485 Repeater optional When communication lines exceed 4000 ft 1200 meter or more than 32 MIR modules are connected or for line Isolation between two MIR stations a repea...

Страница 18: ...on and hook up Before placing a module in an existing network the module should be configured Default Factory Settings Address 01 hexadecimal The basic hook up for module configuration is shown below...

Страница 19: ...ower the MIR module on while shorting the INIT and GND terminals See Figure 2 3 or set the INIT switch to Init See Figure 2 4 Figure 2 3 Grounding the INIT Terminal Set controller number through compu...

Страница 20: ...hapter 2 Chapter 2 installation Guideline 2 11 2 4 Multiple Module Hookup The Figure below is an example of how MIR modules are connected in a multiple module network Figure 2 5 Multi module Connectio...

Страница 21: ...Chapter 3 Chapter 3 I O Modules 3 39 Application Wiring Figure 3 35 MIR6000 Universal Analog Input Wiring Diagram...

Страница 22: ...RS 485 Network E...

Страница 23: ...o 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 In industry shielded twisted pair is...

Страница 24: ...asychained This limitation is a physical one When using more modules per segment the IC driver current rapidly decreases causing communication errors Totally the network can hold up to 256 addressable...

Страница 25: ...s of the first segment A tree structure is the result This scheme is not recommended when using long lines since it will cause a serious amount of signal distortion due to a signal reflection in a sev...

Страница 26: ...e of the resistor should be a close as possible to the characteristic impedance of the line Although receiver devices add some resistance to the whole of the transmission line normally it is sufficien...

Страница 27: ...parallel receiver resistance RP will therefore be equal to RP 36 x 103 30 1200 Ohm While the termination receptor RT will equal RT RO 1 RO RP Thus for a line with a characteristic impedance of 100 re...

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