Connect Tech DFlex-4/104 - page 81

Chapter 4: Appendix H - 20mA Current Loop 4-31

DFlex-4/104 User's Manual, ver. 0.04

Current Loop Cable Wiring

You can wire DFlex-4/104 adapters with the 20mA Current Loop

option in various ways to communicate with 20mA Current Loop

peripherals. This section will descibe a few examples of current

loop cabling schemes.

Figure 21 describes a 4 wire cabling scheme between a port on

the DFlex-4/104 adapter to another port on the DFlex-4/104

adapter.

Figure 21: Current Loop wiring diagram (4 wire)

1

8

2

7

RxD +

TxD +

RxD -

TxD -

4

7

9

8

20mA

20mA

TxD +

RxD -

RxD +

TxD -

3

2

6

1

XMTR

HCPL 4100

RCVR

HCPL 4200

TxD Source

TxD Return

RxD Source

RxD Return

Optically isolated station

(Passive transmitters/receivers)

Non-isolated station

(

Active transmitters/receivers

)

Port 1

DB-9 male

Port 2

DB-9 male

I

SRC

XMTR

HCPL 4100

RCVR

HCPL 4200

I

SRC

Note:

The example above illustrates a 20mA current loop cable wiring

configuration between one port of an DFlex-4/104 adapter and

another port of an DFlex-4/104 adapter. This example shows

wiring for both active and passive modes

Contents

Main Connect Tech Inc. DFlex-4/104 Page LIMITED WARRANTY Copyright Notice Trademark Acknowledgment Page Page Table of Contents Page List of Tables List of Figures Page Chapter 1: Introduction Page Page Page Page Page Chapter 1: Introduction 1-5 DFlex-4/104 User's Manual, ver. 0.04 Figure 2: DFlex-4/104 - 16 port configuration Page Page Page Page Page Chapter 2: Hardware Installation Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Chapter 3: Software Installation Page Page Page Page Utilities Chapter 4: Appendices Page Appendix A: Specifications Page Appendix B: Connectors/Pinouts Page Page Page Appendix C: Factory Settings Page Page Page Appendix D: SLIM Insertion/Removal Page Appendix E: RS-232 SLIM Option Page Page 4-16 Chapter 4: Appendix E - RS-232 Option Table 8: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low. Appendix F: RS-485/422 Options Page Chapter 4: Appendix F - RS-485/422 Options 4-19 DFlex-4/104 User's Manual, ver. 0.04 Figure 14: RS-485/422 SLIM partial schematic 4-20 Chapter 4: Appendix F - RS-485/422 Option Table 9: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low. Page Page Appendix G: RS-423 Options Page Chapter 4: Appendix G - RS-423 Options 4-25 Table 10: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low. Page Appendix H: 20mA Current Loop Option Page Page 4-30 Chapter 4: Appendix H - 20mA Current Loop Table 11: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low.