Connect-tech DFlex-4/104 Bedienungsanleitung PDF herunterladen (Seite 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)

RxD +

TxD +

RxD -

TxD -

20mA

TxD +

RxD -

RxD +

TxD -

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

SRC

XMTR

HCPL 4100

RCVR

HCPL 4200

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

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