Bb-electronics 3PCI2 Bedienungsanleitung PDF herunterladen (Seite 49)

44 Chapter 6 Documentation Number 3PCI2-0903 Manual

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B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

Chapter 6:

RS-422/RS-485 Connections/Operation

These modes support 2 channels - transmit and receive. The

pinouts of the DB-9 male connector are given in Table 4.

Connect only to specified pins for proper operation.

2-Wire RS-485 Connections

Fig. 6.1

2-Wire RS-485: Your cables must bridge pins #1 & #3 and pins #2 &

#9 in order to receive and transmit. Connect from Pin #2 to Data

B(+) of your devices and from pin #3 to Data A(-) of your devices.

Make sure your Mode/Jumpers are set, and that the driver Setting

for DTR Operation is RS-485 Mode in the Device Manager.

Note that the EIA RS-422 Specification labels data lines with an "A"

and "B" designator. Some RS-422 or RS-485 equipment uses a "−"

and "+" designator. In most cases, the "A" line is the equivalent of

the "−" line and the "B" line is the equivalent of the "+" line. Some

device manufacturers may not follow the standard designation for

RS-422 or RS-485, using the A connection for “+” and the B for “-“.

In such cases, reversing the line pair permits operation.

Table 4: RS-422/485 Pinouts

Name Description Direction DB9M

RD(A) −

−−

−

Receive Data A Input 1

TD(B) + Transmit Data B Output 2

TD(A) −

−−

−

Transmit Data A Output 3

GND Signal Ground ------ 5

RD(B) + Receive Data B Input 9

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Bb-electronics 3PCI2 Bedienungsanleitung Seite 49