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.

Table 4: RS-422/485 Pinouts

Name

Description

Direction

DB9M

 

 

 

Pin

 

 

 

 

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

Connect only to specified pins for proper operation.

2-Wire RS-485 Connections

Fig. 6.1

2-WireRS-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.

44

Chapter 6

Documentation Number 3PCI2-0903 Manual

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

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B&B Electronics 3PCI2 manual RS-422/RS-485 Connections/Operation, RS-422/485 Pinouts Name Description Direction
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3PCI2 specifications

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