Connect-tech Blue Heat/PCI PCI Serial Communications Uživatelský manuál stáhnout pdf (Strana 42)

Blue Heat/PCI User’s Manual, Connect Tech Inc.

Revision 0.11 42

Current Loop Cable Wiring

You can wire Blue Heat/PCI CL adapters in various ways to communicate with 20mA Current

Loop peripherals. A few examples of Current Loop cabling schemes follow.

Figure 16 below depicts a 4 wire cabling scheme between a port on the Blue Heat/PCI CL

adapter to another port on the Blue Heat/PCI CL adapter.

Figure 16: 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

SRC

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

Note:

The example above illustrates a 20mA Current Loop cable

wiring configuration between one port of a Blue Heat/PCI CL

adapter and another port of a Blue Heat/PCI CL adapter. This

example shows wiring for both active and passive modes

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